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Drive Configuration

Manual No. 775029

2-51

How Do I Define Additional Logical Drives?

☞

From the main menu, press Enter with Configure RAID Drive

selected (Figure 2-40).

Figure 2-40. Main Menu - Configure RAID Drive

☞

On the Configure RAID Drive screen, use the arrow key to

select Custom, then press Enter (Figure 2-41).

Figure 2-41. Configure RAID Drive - Custom

Summary of Contents for Mylex RAID EzAssist

Page 1: ...RAID EzAssist v1 00 Configuration Utility User Reference Guide P N 775029 00...

Page 2: ......

Page 3: ...nts of this manual are copyrighted by Mylex Corporation The information contained herein is the exclusive property of Mylex Corporation and shall not be copied transferred photocopied translated on pa...

Page 4: ...document or its contents should be addressed to Mylex Corporation at the address shown on the cover The following paragraph does not apply to the United Kingdom or any country where such provisions a...

Page 5: ...following conventions are used This Graphic and Text Identifies a Task This Graphic and Text Identifies a Subtask Under the Above This graphic and text states a particular action to perform OR An alt...

Page 6: ......

Page 7: ...sign Existing Spare Drives 2 65 How Do I Make Use of the Spanning Feature 2 71 How Do I Exit RAID EzAssist 2 88 Chapter 3 Controller Configuration How Do I View Controller Configuration Information 3...

Page 8: ...4 How Do I Visually Locate a Physical Device 4 62 How Do I Rebuild Redundancy Data on a Physical Drive 4 66 How Do I Format a Physical Drive 4 71 How Do I Change Physical Drive Status 4 75 How Do I Re...

Page 9: ...tallation guide Installed your Mylex controller s in the target system Connected appropriate cables between your controller s and the set of disk drives which you intend to use with each controller Se...

Page 10: ...xx xx Month Day Year Mylex Corporation Shortly after some additional messages from the Mylex controller are displayed including Press Alt M for BIOS Options DACxxxx 2 GB Disk BIOS is enabled Note If t...

Page 11: ...ways starts by scanning for Mylex controllers and target drives Figure 1 1 Figure 1 1 RAID EzAssist Scans for Controllers and Drives Allow scanning to complete Since this is a first time configuration...

Page 12: ...w key to select No then press Enter Please see Chapter 3 for information on changing Global SCSI and Startup parameters Return here when you re done to continue first time RAID configuration Note Afte...

Page 13: ...drive a JBOD 2 drives a RAID 1 mirrored set 3 drives a 3 drive RAID 5 striping with parity configuration 4 8 drives a 3 4 5 6 or 7 drive RAID 5 striping with parity configuration adding one device as...

Page 14: ...do an Automatic configuration press Enter with Automatic selected Now see Option 1 Do an Automatic Configuration for details If you want to do an Assisted configuration use the arrow key to select As...

Page 15: ...3 disk drives No For 4 8 disk drives Yes Optimization For 1 disk drive Performance no fault tol For 2 disk drives Performance For 3 or more disk drives Capacity Logical Drive Count 1 Total Useable Cap...

Page 16: ...the disk drive display field press PgDn to see the additional disk drives in the array Optional Alternate PgUp and PgDn to see the entire list of disk drives in the array Optional If you want to see a...

Page 17: ...ation use the arrow key to select Cancel then press Enter When you apply the new configuration RAID EzAssist writes configuration information to the Mylex controller This takes a few moments so a mess...

Page 18: ...nual Figure 1 6 Writing RAID Configuration Please Wait Wait for the configuration information to be written to the controller Next you ll see a Configuration Status screen Figure 1 7 Your automatic co...

Page 19: ...oot your operating system and install the Mylex driver from within the operating system In either case refer to the appropriate operating system chapter in the Disk Array Controller Software Kit Insta...

Page 20: ...llowing condition Number of Unconfigured Drives on Controller 1 Note If you have only one unconfigured drive on this controller your only configuration option is JBOD a non fault tolerant option You w...

Page 21: ...ive screen is displayed under the following conditions Fault Tolerance YES AND Number of Unconfigured Drives on Controller 3 Note If you have two unconfigured drives on this controller you ll get a RA...

Page 22: ...lure with no loss of data although there would be degraded performance It is usually beneficial to reserve a spare drive for the array if you can afford not to use the capacity of the drive for array...

Page 23: ...1 10 Figure 1 10 Optimize for Capacity At this point you choose whether available capacity or array performance is the top criterion in your fault tolerant array If you choose Capacity you ll be reque...

Page 24: ...ss Enter with Capacity selected If you want to optimize your array for performance use the arrow key to select Performance then press Enter Figure 1 11 Figure 1 11 Optimize for Performance Logical Dri...

Page 25: ...set logical drive capacities or settings individually you must use Custom Configuration See Option 3 Do a Custom Configuration If you want to set only one 1 logical drive press Enter with Ok selected...

Page 26: ...apacity to set up the specified number of logical drives with the optimization you ve selected previously The Capacity Usage screen is displayed Figure 1 13 Figure 1 13 Capacity Usage By default the m...

Page 27: ...up arrow key to select the capacity usage field Type in a number representing the gigabytes GB to be used in the current configuration This number must be lower than the maximum value displayed Press...

Page 28: ...l disk drives in the array Optional Alternate PgUp and PgDn to see the entire list of disk drives in the array Optional If you want to see additional configuration details use the arrow key to select...

Page 29: ...nfiguration use the arrow key to select Cancel then press Enter When you apply the new configuration RAID EzAssist writes configuration information to the Mylex controller This takes a few moments so...

Page 30: ...need to install the operating system and the Mylex driver concurrently If the operating system is already installed the Mylex controller is a secondary controller You will need to boot your operating...

Page 31: ...ild multiple arrays Configure logical drives individually Select a specific RAID level Select the write caching method Write Thru or Write Back Set the stripe size1 Set logical drive size by physical...

Page 32: ...are setting up a first time configuration so we ll use the menu s first option Configure a New Disk Array Press Enter with the Configure a New Disk Array option selected Build Disk Arrays The first st...

Page 33: ...the Disk Array box to the right The Tab key shifts control to the buttons or from the buttons back to Unused Drives When buttons are in focus arrow keys select a button and Enter activates the highlig...

Page 34: ...he disk array Repeat the step above for as many disk drives as you wish to add to the array When you ve finished adding drives press the Tab key to switch focus to the buttons Figure 1 20 is a example...

Page 35: ...igure 1 21 Define Logical Drives or Return to Disk Array Set Up Do you want to build additional arrays at this time If you want to set up additional arrays it is convenient to do so at this time befor...

Page 36: ...he arrow key if necessary to select Yes then press Enter Define Logical Drives Logical drives for the array s you just set up are defined from the Logical Drive Definition screen Figure 1 22 Figure 1...

Page 37: ...the logical drive definition fields When buttons are in focus arrow keys select a button and Enter activates the highlighted button Arrow keys rotate selections through Add Drive Apply Cancel Clear Al...

Page 38: ...aching method Thru for Write Through Back for Write Back OR Press Spacebar to display a box of available choices use the arrow key to select your desired write caching method then press Enter Next we...

Page 39: ...itional logical drives Use the right arrow key to select either the Physical or Logical Capacity GB definition field then type a numeric decimal value for the physical or logical capacity to be used i...

Page 40: ...as you haven t applied the configuration to the controller you can delete the logical drives you ve set up and define new ones RAID EzAssist lets you Delete the most recent logical drive you ve added...

Page 41: ...focus to the buttons use the arrow key to select Apply then press Enter OR To cancel the configuration press Tab if necessary to switch focus to the buttons use the arrow key to select Cancel then pre...

Page 42: ...troller you will need to install the operating system and the Mylex driver concurrently If the operating system is already installed the Mylex controller is a secondary controller You will need to boo...

Page 43: ...Yes then press Enter to exit RAID EzAssist The system reboots Begin operating system installation if necessary or allow your installed operating system to boot Refer to the Disk Array Controller Soft...

Page 44: ...on Shortly after some additional messages from the Mylex controller are displayed including Press Alt M for BIOS Options DACxxxx 2 GB Disk BIOS is enabled Note If the second line reads BIOS is disable...

Page 45: ...ays starts by scanning for Mylex controllers and target drives Figure 1 29 Figure 1 29 RAID EzAssist Scans for Controllers and Drives Allow scanning to complete Since this is a first time configuratio...

Page 46: ...Controller 0 If you want to configure a controller other than this you ll have to answer NO If you want to adjust controller parameters or if you want to configure a controller other than the default...

Page 47: ...Use the arrow keys to select a controller from the list then press Enter Figure 1 31 Note All operations will take place on the selected active controller To work with other controllers you will need...

Page 48: ...er s Manual Figure 1 32 Select Configure a RAID Drive From the main menu press Enter with Configure a RAID Drive selected Figure 1 32 At this time please continue from the Choose a Configuration Metho...

Page 49: ...Assigning Unassigning Spare Drives Enabling Disabling Using Spanning How Do I Start RAID EzAssist Power On Your System Regardless of whether an operating system is installed on your computer system y...

Page 50: ...tted time you ll see RAID Configuration will start after system initialization completes X system drives installed If you were too late pressing Alt R simply reboot and start again Wait for RAID EzAss...

Page 51: ...nstalled If so see How Do I Configure Multiple Mylex Controllers in Chapter 1 2 Is this a first time configuration If no previous configuration has been set on the controller see the Get Started step...

Page 52: ...ured drives press Enter with Yes selected OR If you want to do something besides drive configuration use the arrow key to select No then press Enter 4 Are all the drives already configured If all driv...

Page 53: ...drives are already configured you can either 1 add more drives rescan then configure or 2 use Advanced Options to clear the current configuration Chapter 5 then reconfigure Chapter 1 or 2 How Do I Ch...

Page 54: ...disk drives 1 drive a JBOD 2 drives a RAID 1 mirrored set 3 drives a 3 drive RAID 5 striping with parity configuration 4 8 drives a 3 4 5 6 or 7 drive RAID 5 striping with parity configuration adding...

Page 55: ...with Automatic selected Now see How Do I Do an Automatic Configuration on page 2 8 for details If you want to do an Assisted configuration use the arrow key to select Assisted then press Enter Now see...

Page 56: ...or 4 8 disk drives Yes Optimization For 1 disk drive Performance no fault tolerance For 2 disk drives Performance For 3 or more disk drives Capacity Logical Drive Count 1 Total Useable Capacity Depend...

Page 57: ...ield press PgDn to see the additional disk drives in the array Optional Alternate PgUp and PgDn to see the entire list of disk drives in the array Optional If you want to see additional configuration...

Page 58: ...the configuration use the arrow key to select Cancel then press Enter When you apply the new configuration RAID EzAssist writes configuration information to the Mylex controller This takes a few mome...

Page 59: ...RAID Configuration Please Wait Wait for the configuration information to be written to the controller Next you ll see a Configuration Status screen Figure 2 8 Your automatic configuration has been com...

Page 60: ...Enter When the main menu appears Look in this chapter if you ll be doing an additional configuration activity Refer to Chapter 3 if you ll be doing controller configuration Refer to Chapter 4 if you l...

Page 61: ...of Unconfigured Drives on Controller 1 Note If you have only one unconfigured drive on this controller your only configuration option is JBOD a non fault tolerant option You will therefore NOT see th...

Page 62: ...he Spare Drive screen is displayed under the following conditions Fault Tolerance YES AND Number of Unconfigured Drives on Controller 3 Note If you have two unconfigured drives on this controller you...

Page 63: ...l accept another drive failure with no loss of data although there would be degraded performance It is usually beneficial to reserve a spare drive for the array if you can afford not to use the capaci...

Page 64: ...ion which optimizes for performance You will therefore NOT see the Optimization Priority choice screen Assuming your situation meets the conditions above the Optimization Priority screen is displayed...

Page 65: ...as overhead of only one drive s capacity RAID 0 1 has a write performance advantage over RAID 5 but since the striped set is mirrored available capacity is only half of the total capacity in the drive...

Page 66: ...h logical drive that you create under Assisted Configuration will have identical capacity and settings RAID level caching etc If you wish to set logical drive capacities or settings individually you m...

Page 67: ...um available capacity is displayed in the Capacity Usage field If you wish to reserve some of the capacity of your drives to set up future arrays you may choose a smaller gigabyte GB value for the cur...

Page 68: ...in the array you ll see a small down arrow next to the disk drive display field Optional If there is a down arrow next to the disk drive display field press PgDn to see the additional disk drives in t...

Page 69: ...D Configuration Summary screen To apply the configuration use the arrow key if necessary to select Apply then press Enter OR To cancel the configuration use the arrow key to select Cancel then press E...

Page 70: ...e 2 17 Writing RAID Configuration Please Wait Wait for the configuration information to be written to the controller Next you ll see a Configuration Status screen Figure 2 18 Your assisted configurati...

Page 71: ...main menu appears Look in this chapter if you ll be doing an additional configuration activity Refer to Chapter 3 if you ll be doing controller configuration Refer to Chapter 4 if you ll be doing a mo...

Page 72: ...el Select the write caching method Write Thru or Write Back Set the stripe size1 Set logical drive size by physical or logical capacity Add capacity to an existing array Assign additional spare drives...

Page 73: ...nal Logical Drives on page 2 51 If you have any currently unconfigured drives that you want to assign as spare drives see How Do I Assign Additional Spare Drives on page 2 59 If you have any currently...

Page 74: ...used Drives or Disk Array fields Inside Unused Drives arrow keys select a drive Enter accepts the highlighted drive and adds it to the Disk Array box to the right The Tab key shifts control to the but...

Page 75: ...e disk array Repeat the step above for as many disk drives as you wish to add to the array When you ve finished adding drives press the Tab key to switch focus to the buttons Figure 2 21 is a example...

Page 76: ...hown in Figure 2 22 Figure 2 22 Define Logical Drives or Return to Disk Array Set Up Do you want to build additional arrays at this time If you want to set up additional arrays it is convenient to do...

Page 77: ...y to select Yes then press Enter Define Logical Drives Logical drives for the array s you just set up are defined from the Logical Drive Definition screen Figure 2 23 Figure 2 23 Logical Drive Definit...

Page 78: ...finition fields When buttons are in focus arrow keys select a button and Enter activates the highlighted button Arrow keys rotate selections through Add Drive Apply Cancel Delete Drive and Clear All L...

Page 79: ...ss Spacebar to display a box of available choices use the arrow key to select your desired write caching method then press Enter Next we ll set the stripe size for this logical drive and all subsequen...

Page 80: ...ult tolerance spare drives etc If you intend to set up more than one logical drive in this array then set the capacity for the first logical drive somewhere below the maximum to leave space for additi...

Page 81: ...e 2 25 Ready to Add the Logical Drive The logical drive is added to the display box and focus returns to the logical drive definition field line if capacity remains for additional logical drives Figur...

Page 82: ...delete all logical drives that you added press Tab if necessary to switch focus to the buttons use the arrow key to select Clear All then press Enter Define new logical drives as described in Define L...

Page 83: ...2 27 Writing RAID Configuration Please Wait Wait for the configuration information to be written to the controller When the process is complete RAID EzAssist brings you to the main menu Figure 2 28 Fi...

Page 84: ...tional configuration activity Refer to Chapter 3 if you ll be doing controller configuration Refer to Chapter 4 if you ll be doing a monitoring or maintenance activity or adding drives requiring a res...

Page 85: ...n an array without having to 1 back up data 2 reconfigure the array to a larger number of drives and 3 restore existing data to the new array The extra space is then used to create additional logical...

Page 86: ...the arrow key to select Custom then press Enter Figure 2 30 Figure 2 30 Configure RAID Drive Custom The Custom Configuration menu is displayed Figure 2 31 Figure 2 31 Custom Configuration Menu If you...

Page 87: ...panned array A total of 32 logical drives have already been configured on this controller All target IDs on all channels are used in existing arrays The drive to be added has a capacity that is too sm...

Page 88: ...ts the highlighted disk array Use the arrow keys to select the disk array you want to expand then press Enter Select Physical Drives to Use for Expansion The next step is to select one or more availab...

Page 89: ...and adds it to the Disk Array box to the right The Tab key shifts control to the buttons or from the buttons back to Unused Drives When buttons are in focus arrow keys select a button and Enter activa...

Page 90: ...as many disk drives as you wish to add to the existing disk array When you ve finished adding drives press the Tab key to switch focus to the buttons Figure 2 34 is a example of how your screen might...

Page 91: ...r existing disk arrays To expand additional disk arrays use the arrow key if necessary to select No then press Enter Repeat the steps described earlier in this section To define logical drives at this...

Page 92: ...cycle through the valid options When the desired option is visible use the arrow key to move to another field For Physical Capacity or Logical Capacity definition fields type a numeric decimal value r...

Page 93: ...ld power fail Use Write Back only if you have a battery backup unit BBU or uninterruptable power supply UPS installed to preserve data in the cache Use the right arrow key to select the Write Cache de...

Page 94: ...choices use the arrow key to select your desired stripe size then press Enter Next we set a size for this logical drive based on the maximum available capacity You can set logical drive size in terms...

Page 95: ...troller you can delete the logical drives you ve set up and define new ones RAID EzAssist lets you Delete the most recent logical drive you ve added OR Delete all the logical drives you ve added To de...

Page 96: ...o switch focus to the buttons use the arrow key to select Apply then press Enter OR To cancel the expanded configuration press Tab if necessary to switch focus to the buttons use the arrow key to sele...

Page 97: ...2 38 Writing RAID Configuration Please Wait Wait for the configuration information to be written to the controller When the process is complete RAID EzAssist brings you to the main menu Figure 2 39 Fi...

Page 98: ...an additional configuration activity Refer to Chapter 3 if you ll be doing controller configuration Refer to Chapter 4 if you ll be doing a monitoring or maintenance activity or adding drives requirin...

Page 99: ...ical Drives From the main menu press Enter with Configure RAID Drive selected Figure 2 40 Figure 2 40 Main Menu Configure RAID Drive On the Configure RAID Drive screen use the arrow key to select Cust...

Page 100: ...k arrays use the arrow key to select Define Logical Drive s on the Custom Configuration menu then press Enter Note If you have not previously defined at least one disk array you will be unable to use...

Page 101: ...keys cycle through the valid options When the desired option is visible use the arrow key to move to another field For Physical Capacity or Logical Capacity definition fields type a numeric decimal va...

Page 102: ...e a battery backup unit BBU or uninterruptable power supply UPS installed to preserve data in the cache Use the right arrow key to select the Write Cache definition field then Press the or key to find...

Page 103: ...sed on the maximum available capacity You can set logical drive size in terms of either physical capacity or logical capacity Logical capacity takes into account overhead for fault tolerance spare dri...

Page 104: ...e you ve added OR Delete all the logical drives you ve added To delete the most recently added logical drive press Tab if necessary to switch focus to the buttons use the arrow key to select Delete La...

Page 105: ...guration information to the Mylex controller This takes a few moments so a message is displayed Figure 2 44 Figure 2 44 Writing RAID Configuration Please Wait Wait for the configuration information to...

Page 106: ...er if you ll be doing an additional configuration activity Refer to Chapter 3 if you ll be doing controller configuration Refer to Chapter 4 if you ll be doing a monitoring or maintenance activity or...

Page 107: ...are Drives From the main menu press Enter with Configure RAID Drive selected Figure 2 46 Figure 2 46 Main Menu Configure RAID Drive On the Configure RAID Drive screen use the arrow key to select Custo...

Page 108: ...onfigured drives as additional spare drives use the arrow key to select Assign Spare Drive s on the Custom Configuration menu then press Enter Note If you do not have any unconfigured drives available...

Page 109: ...er selects the highlighted physical device Use the arrow keys to select a physical drive with current status Unconfigured then press Enter Apply the Configuration to the Controller To add the physical...

Page 110: ...guration use the arrow key to select Yes if necessary then press Enter OR To cancel the configuration change use the arrow key to select No if necessary then press Enter When you apply the new configu...

Page 111: ...Please Wait Wait for the configuration information to be written to the controller When the process is complete RAID EzAssist brings you back to the main menu Figure 2 52 or to select a controller if...

Page 112: ...in this chapter if you ll be doing an additional configuration activity Refer to Chapter 3 if you ll be doing controller configuration Refer to Chapter 4 if you ll be doing a monitoring or maintenanc...

Page 113: ...are Drives From the main menu press Enter with Configure RAID Drive selected Figure 2 53 Figure 2 53 Main Menu Configure RAID Drive On the Configure RAID Drive screen use the arrow key to select Custo...

Page 114: ...to unconfigured status use the arrow key to select Assign Spare Drive s on the Custom Configuration menu then press Enter Note If you do not have any spare drives currently assigned on this controller...

Page 115: ...Enter selects the highlighted physical drive Use the arrow keys to select a physical drive with current status Spare then press Enter Apply the Configuration to the Controller To add the physical dri...

Page 116: ...tion To apply the configuration use the arrow key to select Yes then press Enter OR To cancel the configuration change press Enter with No selected When you apply the new configuration RAID EzAssist w...

Page 117: ...Please Wait Wait for the configuration information to be written to the controller When the process is complete RAID EzAssist brings you back to the main menu Figure 2 59 or to select a controller if...

Page 118: ...in this chapter if you ll be doing an additional configuration activity Refer to Chapter 3 if you ll be doing controller configuration Refer to Chapter 4 if you ll be doing a monitoring or maintenance...

Page 119: ...B drives and three 2 0 GB drives I have a few options Build one array A0 using all six 6 disk drives Because drives in an array will always be treated as the same size the three 4 0 GB drives will be...

Page 120: ...arrays must have the same number of physical drives in each array AND must be defined consecutively See Table 2 5 for examples of when spanning is and is not allowed Table 2 5 Examples of Spanning an...

Page 121: ...r of physical drives in each of the spanned arrays NOT on the total number of drives See Table 2 6 for an example Table 2 6 RAID Levels in Spanned Configurations Note that assignment of spare drives r...

Page 122: ...isable Spanning If the main menu is displayed press Enter with Configure RAID Drive selected Figure 2 60 Figure 2 60 Main Menu Configure RAID Drive On the Configure RAID Drive screen use the arrow key...

Page 123: ...Configuration Menu If you want to see whether spanning is turned on OR if you want to enable or disable the spanning feature use the arrow key to select Spanning on the Custom Configuration menu then...

Page 124: ...o enable spanning use the arrow key to select Yes then press Enter OR If you don t want to enable spanning press Enter with No selected However if spanning is currently enabled when you select the Spa...

Page 125: ...guration Manual No 775029 2 77 Figure 2 64 Disable Spanning If you want to disable spanning press Enter with Yes selected OR If you don t want to disable spanning use the arrow key to select No then p...

Page 126: ...om Configuration menu use the arrow key to select Configure a New Disk Array then press Enter Figure 2 65 Figure 2 65 Select Configure a New Disk Array The first step is to build at least two disk arr...

Page 127: ...it to the Disk Array box to the right The Tab key shifts control to the buttons or from the buttons back to Unused Drives When buttons are in focus arrow keys select a button and Enter activates the...

Page 128: ...Repeat the step above for as many disk drives as you wish to add to the array When you ve finished adding drives press the Tab key to switch focus to the buttons Figure 2 67 is a example of how your...

Page 129: ...gical Drives or Return to Disk Array Set Up Do you want to define logical drives now For spanning the answer is NO because you must have at least two disk arrays with equal numbers of drives for spann...

Page 130: ...RAID Level Write Cache and Stripe Size KB definition fields the Spacebar brings up a list of valid options Arrow keys move among the options and Enter selects an option For RAID Level Write Cache and...

Page 131: ...Glossary for a detailed definition In a nutshell Write Back caching speeds write performance but risks loss of data in the cache buffer should power fail Use Write Back only if you have a battery bac...

Page 132: ...yed should consist of the total spanned capacity of all the spanned arrays identified below the screen title Refer back to Figure 2 69 for an example You can set logical drive size in terms of either...

Page 133: ...long as you haven t applied the configuration to the controller you can delete the logical drives you ve set up and define new ones RAID EzAssist lets you Delete the most recent logical drive you ve...

Page 134: ...to switch focus to the buttons use the arrow key to select Cancel then press Enter When you apply the new configuration RAID EzAssist writes configuration information to the Mylex controller This tak...

Page 135: ...doing an additional configuration activity Refer to Chapter 3 if you ll be doing controller configuration Refer to Chapter 4 if you ll be doing a monitoring or maintenance activity or adding drives re...

Page 136: ...c key OR To exit RAID EzAssist when you re not at the main menu press the Esc key until you reach the main menu then press Esc one more time You ll see the RAID EzAssist exit confirmation screen Figur...

Page 137: ...Information Changing Global Properties Changing SCSI Transfer Properties Changing Startup Properties The following table is a summary of the specific properties you are able to change along with their...

Page 138: ...a Controller on page 3 9 If you wish to view and or modify any Startup Properties for the selected Mylex controller see the section called How Do I Change Startup Properties for a Controller on page 3...

Page 139: ...on Manual No 775029 3 3 Figure 3 2 Controller Configuration Screen Examine the Controller Configuration Details Table 3 2 shows the information displayed on the Controller Configuration screen This in...

Page 140: ...ation screen The Properties menu is displayed Figure 3 3 Field Description Vendor Identifies the manufacturer of the controlller Mylex Model Identifies which Mylex controller you have For example DAC1...

Page 141: ...3 Properties Menu Overlays Controller Configuration Screen Enter the Global Properties Screen When the Properties menu is displayed press Enter with Global selected The Global Properties screen is di...

Page 142: ...any time you can press Enter to accept the currently visible settings and close the screen View Modify Automatic Rebuild Management Default Enabled The Automatic Rebuild Management option refers to th...

Page 143: ...ment is disabled Use the arrow key to select the StorageWorks Fault Management TM field then Press the or key to set the value to Enabled or Disabled as desired OR Press Spacebar to display a box of a...

Page 144: ...the Active Negation Setting Default Disabled Enable for cleaner SCSI signal transmissions Use the arrow key to select the Active Negation field then Press the or key to set the value to Enabled or Di...

Page 145: ...menu from the Controller Configuration screen Press Enter with Properties selected on the Controller Configuration screen The Properties menu is displayed Figure 3 5 Figure 3 5 Properties Menu Overla...

Page 146: ...he options and Enter selects an option The and keys cycle through the valid options When the desired option is visible use the arrow key to move to another field The Tab key shifts control to the butt...

Page 147: ...g drive ID setting SCSI cable is too long faulty equipment etc However if you do wish to change this setting Use the arrow keys to select the Bus Speed MHz field for the desired channel then Press the...

Page 148: ...to change this parameter since the controller negotiates the supported data bus width However if you do wish to change this setting Use the arrow keys to select the Bus Width 8 Narrow 16 Wide field f...

Page 149: ...menu from the Controller Configuration screen Press Enter with Properties selected on the Controller Configuration screen The Properties menu is displayed Figure 3 7 Figure 3 7 Properties Menu Overlay...

Page 150: ...pin Up field the and keys cycle through the valid options When the desired option is visible use the arrow key to move to another field For Number of Disk Drives per Spin Initial Delay seconds and Del...

Page 151: ...rval indicated by the Delay Between Spins seconds value see below On Power This spin up mode assumes that all drives are already spinning and proceeds to interrogate the drives in the same manner as d...

Page 152: ...l Delay seconds field then type the desired numeric value for the number of seconds of initial delay View Modify the Delay Between Spins Setting Default 0 This specifies the number of seconds between...

Page 153: ...ministration and maintenance activities Also whenever you alter the physical configuration of your setup such as to add or remove physical drives or if drive status changes while RAID EzAssist is runn...

Page 154: ...hts the physical drives that comprise the selected logical drive Check consistency with error repair if requested of the selected logical drive Manually request logical drive initialization 1 Note tha...

Page 155: ...s hard errors and miscellaneous errors then reset the counts to 0 Assign an unconfigured drive as a spare or return a current spare drive to unconfigured status Physically locate with a blinking light...

Page 156: ...ey to select Perform Administration on on the main menu then press Enter The Administration menu is displayed Figure 4 2 Figure 4 2 Administration Menu Disk Array Press Enter with Disk Array selected...

Page 157: ...rrow keys to select the disk array you want to monitor then press Enter View Disk Array Status and Information The Disk Array Configuration screen for the selected array is displayed Figure 4 4 This s...

Page 158: ...Figure 4 4 Disk Array Configuration Screen Optional If a small down arrow is displayed beside the physical drive field press PgDn to view additional drives in the disk array Press PgUp to move up the...

Page 159: ...istration on on the main menu then press Enter The Administration menu is displayed Figure 4 5 Figure 4 5 Administration Menu Logical Drive Use the arrow key to select Logical Drive then press Enter S...

Page 160: ...en This screen uses the following navigation strategy Arrow keys move among the available logical drives Enter selects the highlighted logical drive Use the arrow keys to select the logical drive you...

Page 161: ...nel ID vendor model version capacity GB and status of all physical drives that comprise the selected logical drive The name of the logical drive for example Logical Drive 0 The overall status of the l...

Page 162: ...all down arrow is displayed beside the physical drive field press PgDn to view additional drives used in this logical drive Press PgUp to move up the list Press Enter with Ok selected to close the Log...

Page 163: ...e Write Back only if you have a battery backup unit BBU or uninterruptable power supply UPS installed to preserve data in the cache Open the Logical Drive Configuration screen as described in How Do I...

Page 164: ...ted to accept the changes OR Use the arrow key to select Cancel then press Enter to leave the cache settings unchanged If you made any changes and selected Ok the following Notice is displayed Figure...

Page 165: ...on the main menu then press Enter The Administration menu is displayed Figure 4 10 Figure 4 10 Administration Menu Logical Drive Use the arrow key to select Logical Drive then press Enter Select a Lo...

Page 166: ...s screen uses the following navigation strategy Arrow keys move among the available logical drives Enter selects the highlighted logical drive Use the arrow keys to select the logical drive whose bad...

Page 167: ...arrow key to select View Bad Data Table then press Enter The Bad Data Table screen for the selected logical drive is displayed Figure 4 13 This screen shows the following information The controller n...

Page 168: ...Do I View the Logical Drive Bad Data Table 4 16 RAID EzAssist User s Manual Figure 4 13 Bad Data Table Press Enter with Ok selected when you have finished viewing the bad data table for this logical d...

Page 169: ...LEDs to blink on all online physical drives that comprise the logical drive Use the arrow key to select Perform Administration on on the main menu then press Enter The Administration menu is displaye...

Page 170: ...s screen uses the following navigation strategy Arrow keys move among the available logical drives Enter selects the highlighted logical drive Use the arrow keys to select the logical drive whose phys...

Page 171: ...ive Use the arrow key to select Locate Drive then press Enter A Notice is displayed for the selected logical drive Figure 4 17 At the same time all the physical drives that comprise the logical drive...

Page 172: ...at Comprise the Logical Drive 4 20 RAID EzAssist User s Manual Figure 4 17 Locate Physical Drives Notice Press Enter with Ok selected after you ve visually located the physical drives When the Notice...

Page 173: ...do this by using the Check Consistency option Use the arrow key to select Perform Administration on on the main menu then press Enter The Administration menu is displayed Figure 4 18 Figure 4 18 Admi...

Page 174: ...creen uses the following navigation strategy Arrow keys move among the available logical drives Enter selects the highlighted logical drive Use the arrow keys to select the logical drive on which to r...

Page 175: ...5029 4 23 Figure 4 20 Logical Drive Menu Advanced Options Use the arrow key to select Advanced Options then press Enter The Logical Drive Advanced Options menu is displayed Figure 4 21 Figure 4 21 Log...

Page 176: ...ey are found Some errors may not be reparable however and attempting to fix them may further corrupt the data If you check consistency without data repair you can determine whether errors exist withou...

Page 177: ...ou need to perform a full drive initialization on a logical drive for any reason such as under instruction from Mylex Technical Support you can use the Initialize Drive option in RAID EzAssist Use the...

Page 178: ...s screen uses the following navigation strategy Arrow keys move among the available logical drives Enter selects the highlighted logical drive Use the arrow keys to select the logical drive to initial...

Page 179: ...5029 4 27 Figure 4 25 Logical Drive Menu Advanced Options Use the arrow key to select Advanced Options then press Enter The Logical Drive Advanced Options menu is displayed Figure 4 26 Figure 4 26 Log...

Page 180: ...Initialize Drive warning screen is displayed Figure 4 27 Figure 4 27 Initialize Drive Initialization will erase all data on the logical drive To cancel your request to initialize the logical drive pr...

Page 181: ...ical mode for too long because a second drive failure will lead to data loss If you have a spare drive assigned the controller can rebuild the failed drive s data using redundant information on the re...

Page 182: ...the main menu then press Enter The Administration menu is displayed Figure 4 28 Figure 4 28 Administration Menu Logical Drive Use the arrow key to select Logical Drive then press Enter Select a Logic...

Page 183: ...uses the following navigation strategy Arrow keys move among the available logical drives Enter selects the highlighted logical drive Use the arrow keys to select the logical drive with Critical stat...

Page 184: ...ssist User s Manual Figure 4 30 Logical Drive Menu Advanced Options Use the arrow key to select Advanced Options then press Enter The Logical Drive Advanced Options menu is displayed Figure 4 31 Figur...

Page 185: ...ld Redundancy Data warning screen is displayed Figure 4 32 Figure 4 32 Rebuild Redundancy Data Rebuild redundancy will regenerate the data that was on the failed or offline drive To cancel your reques...

Page 186: ...completion to restore the system to working order WARNING Be careful about canceling a background task because it may leave the logical drive in an unstable state If you cancel a consistency check yo...

Page 187: ...Enter The Administration menu is displayed Figure 4 33 Figure 4 33 Administration Menu Logical Drive Use the arrow key to select Logical Drive then press Enter Select a Logical Drive The first step is...

Page 188: ...een uses the following navigation strategy Arrow keys move among the available logical drives Enter selects the highlighted logical drive Use the arrow keys to select the logical drive whose status in...

Page 189: ...9 4 37 Figure 4 35 Logical Drive Menu Advanced Options Use the arrow key to select Advanced Options then press Enter The Logical Drive Advanced Options menu is displayed Figure 4 36 Figure 4 36 Logica...

Page 190: ...ask then press Enter The Cancel Background Task warning screen is displayed Figure 4 37 Figure 4 37 Cancel Background Task Answering Yes will cancel the task currently running in the background To can...

Page 191: ...tion on on the main menu then press Enter The Administration menu is displayed Figure 4 38 Figure 4 38 Administration Menu Physical Device Use the arrow key to select Physical Device then press Enter...

Page 192: ...This screen uses the following navigation strategy Arrow keys move among the available physical devices Enter selects the highlighted physical device Use the arrow keys to select the physical drive y...

Page 193: ...reen shows the following information The identity of this physical device in terms of its controller channel and target ID The vendor manufacturer of the physical device The model identification of th...

Page 194: ...2 RAID EzAssist User s Manual Figure 4 41 Device Configuration Screen Press Enter with Ok selected to close the Device Configuration screen If you want to change the Read Cache and or Write Cache phys...

Page 195: ...kup unit BBU or uninterruptable power supply UPS installed to preserve data in the cache Open the Device Configuration screen as described in How Do I View Physical Drive Status and Information on pag...

Page 196: ...he changes OR Use the arrow key to select Cancel then press Enter to leave the cache settings unchanged If you made any changes and selected Ok the following Notice is displayed Figure 4 42 Figure 4 4...

Page 197: ...the main menu then press Enter The Administration menu is displayed Figure 4 43 Figure 4 43 Administration Menu Physical Device Use the arrow key to select Physical Device then press Enter Select a Ph...

Page 198: ...screen uses the following navigation strategy Arrow keys move among the available physical devices Enter selects the highlighted physical device Use the arrow keys to select the physical drive whose...

Page 199: ...the arrow key to select View Defect List then press Enter The Defect List menu is displayed Figure 4 46 From this menu you can choose to view the Primary defect list defects registered during drive fo...

Page 200: ...l Figure 4 46 Defect List Menu Primary To view the Primary defect list press Enter with Primary selected The Primary Defect List screen for the selected physical drive is displayed or a message that n...

Page 201: ...Defect List Menu Grown To view the Grown defect list use the arrow key to select Grown then press Enter The Grown Defect List screen for the selected physical drive is displayed or a message that no d...

Page 202: ...n on the main menu then press Enter The Administration menu is displayed Figure 4 48 Figure 4 48 Administration Menu Physical Device Use the arrow key to select Physical Device then press Enter Select...

Page 203: ...owing navigation strategy Arrow keys move among the available physical devices Enter selects the highlighted physical device Use the arrow keys to select the physical drive whose error counts you want...

Page 204: ...then press Enter The Error Counts screen for the selected physical device is displayed Figure 4 51 This screen shows the following information The identity of this physical device in terms of its con...

Page 205: ...ror Counts Screen Reset Physical Drive Error Counts After viewing and noting the error counts you should reset the counts to zero 0 to grow a fresh list for future observation Press Enter with Reset C...

Page 206: ...The Administration menu is displayed Figure 4 52 Figure 4 52 Administration Menu Physical Device Use the arrow key to select Physical Device then press Enter Select a Physical Device The first step i...

Page 207: ...following navigation strategy Arrow keys move among the available physical devices Enter selects the highlighted physical device Option 1 Assign the Physical Device as a Spare Use the arrow keys to s...

Page 208: ...are Unused On the Physical Drive menu use the arrow key to select Designate Drive as Spare Unused then press Enter Apply the Configuration to the Controller To add the physical drive you selected to t...

Page 209: ...on use the arrow key to select Yes if necessary then press Enter OR To cancel the configuration change use the arrow key to select No if necessary then press Enter When you apply the new configuration...

Page 210: ...as Unused 4 58 RAID EzAssist User s Manual Figure 4 56 Writing RAID Configuration Please Wait Wait for the configuration information to be written to the controller Option 2 Return a Spare Drive to U...

Page 211: ...enu is displayed Figure 4 58 Figure 4 58 Physical Drive Menu Designate Drive as Spare Unused On the Physical Drive menu use the arrow key to select Designate Drive as Spare Unused then press Enter App...

Page 212: ...on To apply the configuration use the arrow key to select Yes if necessary then press Enter OR To cancel the configuration change use the arrow key to select No if necessary then press Enter When you...

Page 213: ...Monitoring and Maintenance Activities Manual No 775029 4 61 Figure 4 60 Writing RAID Configuration Please Wait Wait for the configuration information to be written to the controller...

Page 214: ...you can cause a selected physical device s LED to blink Use the arrow key to select Perform Administration on on the main menu then press Enter The Administration menu is displayed Figure 4 61 Figure...

Page 215: ...een uses the following navigation strategy Arrow keys move among the available physical devices Enter selects the highlighted physical device Use the arrow keys to select the physical device you want...

Page 216: ...e 4 63 Physical Drive Menu Locate Device Use the arrow key to select Locate Device then press Enter A Notice is displayed for the selected physical device Figure 4 64 At the same time the physical dev...

Page 217: ...ance Activities Manual No 775029 4 65 Figure 4 64 Locate Physical Device Notice Press Enter with Ok selected after you ve visually located the physical device When the Notice screen disappears the LED...

Page 218: ...rray in critical mode for too long because a second drive failure will lead to data loss If you have a spare drive assigned the controller can rebuild the failed drive s data using redundant informati...

Page 219: ...n press Enter The Administration menu is displayed Figure 4 65 Figure 4 65 Administration Menu Physical Device Use the arrow key to select Physical Device then press Enter Select a Physical Device The...

Page 220: ...his screen uses the following navigation strategy Arrow keys move among the available physical devices Enter selects the highlighted physical device Use the arrow keys to select the physical device wi...

Page 221: ...4 69 Figure 4 67 Physical Drive Menu Advanced Options Use the arrow key to select Advanced Options then press Enter The Physical Drive Advanced Options menu is displayed Figure 4 68 Figure 4 68 Physic...

Page 222: ...line drive m Caution Rebuilding redundancy on a physical drive will also set the entire logical drive of which this physical drive is a part to Critical status until rebuild is complete You may not in...

Page 223: ...s system performance so be sure you run this function at a convenient time Use the arrow key to select Perform Administration on on the main menu then press Enter The Administration menu is displayed...

Page 224: ...n uses the following navigation strategy Arrow keys move among the available physical devices Enter selects the highlighted physical device Use the arrow keys to select the physical drive you want to...

Page 225: ...75029 4 73 Figure 4 72 Physical Drive Menu Advanced Options Use the arrow key to select Advanced Options then press Enter The Physical Drive Advanced Options menu is displayed Figure 4 73 Figure 4 73...

Page 226: ...lect the Format Drive option and press Enter formatting begins immediately on the selected physical drive Use the arrow key to select Format Drive then press Enter Formatting takes place in the backgr...

Page 227: ...changing online status to offline Under certain conditions this will result in a failed drive status and potential data loss Likewise changing the status of an offline drive to online will only return...

Page 228: ...hen press Enter The Administration menu is displayed Figure 4 75 Figure 4 75 Administration Menu Physical Device Use the arrow key to select Physical Device then press Enter Select a Physical Device T...

Page 229: ...ow keys to select a physical drive with status Unconfigured then press Enter Option 2 If you want to unassign a spare drive return to unused status use the arrow keys to select a physical drive with s...

Page 230: ...Advanced Options Menu The Physical Drive menu is displayed Figure 4 77 Figure 4 77 Physical Drive Menu Advanced Options Use the arrow key to select Advanced Options then press Enter The Physical Drive...

Page 231: ...ive Unused then press Enter OR If you selected an Online drive use the arrow key to select Make Drive Offline then press Enter OR If you selected an Offline drive use the arrow key to select Make Driv...

Page 232: ...the physical drive status change you ve requested Setting an unconfigured drive to spare or a spare drive back to unconfigured unused is a configuration change In these cases RAID EzAssist will write...

Page 233: ...s well The point is whenever you make any of these physical changes in your hardware setup you must allow RAID EzAssist to rescan the controllers to update its internal configuration to match the actu...

Page 234: ...vices 4 82 RAID EzAssist User s Manual Figure 4 80 Rescan for New Devices Use the arrow key to select Rescan for New Devices then press Enter RAID EzAssist will rescan the selected controller Figure 4...

Page 235: ...ons be used only by an experienced system administrator We will discuss the following tasks in this chapter Updating Flashing new firmware code to one or more Mylex RAID Controllers or updating the RA...

Page 236: ...r are carried out using the Advanced Options choice on the main menu Figure 5 1 Figure 5 1 Advanced Options Use the arrow key to select Advanced Options on the main menu then press Enter The Advanced...

Page 237: ...elf The same Update Flash Code function can be used to update the BIOS version of RAID EzAssist on your controller Note Whether you re updating firmware BIOS code RAID EzAssist etc you will need to re...

Page 238: ...ist User s Manual Figure 5 3 Update Flash Code Type the name of the image file and drive letter if necessary and press the Tab key Insert the diskette into the floppy diskette drive and press Enter wi...

Page 239: ...ntroller field Inside the Controller field arrow keys select a controller Enter accepts the highlighted controller and adds a check mark OR deselects a controller that already has a check mark You may...

Page 240: ...ers to update press the Tab key to select Ok then press Enter The Flash Code Update warning is displayed Figure 5 5 Figure 5 5 Flash Code Update Warning To begin the update flash process use the arrow...

Page 241: ...h Process Status RAID EzAssist loads the image file information to the controller and stores it You will still need to allow the controller to be programmed Wait for the flash image storage to conclud...

Page 242: ...he controller press Enter with No selected and return to the Choose an Image File for the Update step OR To program the controller now use the arrow key to select Yes then press Enter Wait while the c...

Page 243: ...ecessary Note The backup file that is created is only readable by the controller If you want to create a backup file that maintains configuration information in English use the Print Configuration opt...

Page 244: ...le in which the configuration will be saved type a drive letter if necessary and press the Tab key Insert the diskette into the floppy diskette drive and press Enter with Ok selected to continue The c...

Page 245: ...this option with extreme caution Select the Controller On Which to Restore the Configuration If you have multiple controllers installed navigate to the Welcome screen and select the controller to whic...

Page 246: ...er Type the name of the file which contains the configuration type a drive letter if necessary and press the Tab key Insert the diskette into the floppy diskette drive and press Enter with Ok selected...

Page 247: ...be read later if necessary through a text editor Note If you want to create a backup file that saves configuration information in a format that the controller can read and restore use the Backup Conf...

Page 248: ...figuration will be saved in readable format type a drive letter if necessary and press the Tab key Insert the diskette into the floppy diskette drive and press Enter with Ok selected to continue The c...

Page 249: ...rives connected to the controller Use this option with extreme caution Select the Controller On Which to Clear the Configuration If you have multiple controllers installed navigate to the Welcome scre...

Page 250: ...ration from this controller use the arrow key to select Yes then press Enter OR To cancel your request to clear the configuration press Enter with No selected Wait for the new configuration informatio...

Page 251: ...lect the Clustering Option Use the arrow key to select Advanced Options on the main menu if necessary then press Enter From the Advanced Options menu use the arrow key to select Clustering then press...

Page 252: ...stering press Enter with No selected However if clustering is currently enabled when you select the Clustering option on the Advanced Options menu the Clustering Control notice shown in Figure 5 13 wi...

Page 253: ...nt PCI Controllers that are being clustered to all have unique IDs on the bus Select the Controller Whose Host ID Setting Will Change Navigate to the Welcome screen and select a controller whose host...

Page 254: ...option In the HostID field the and keys cycle through the valid options Stop when the desired option is visible The Tab key shifts control to the buttons or from the buttons back to the HostID field W...

Page 255: ...ting then press Enter Once you ve selected the alternate ID setting press Tab then press Enter with Ok selected If you need to reassign Host IDs for other controllers repeat the entire procedure from...

Page 256: ...How Do I Reassign a Host ID For PCI Controller Clustering 5 22 RAID EzAssist User s Manual...

Page 257: ...addition the 150 and 250 products can work in any PC or server with a PCI slot whether or not they have SCSI interrupt steering logic The 150 and 250 have one Ultra2 SCSI LVD channel ANSI American Na...

Page 258: ...Availability The Background initialization is a safe initialization process which does not erase existing data Compare with foreground initializations that erase all existing data BBU Battery Backup...

Page 259: ...o multiple devices typically used to control external RAID subsystems compare to Internal PCI based RAID subsystems see Internal RAID Controller A bridge RAID controller is often referred to as an ext...

Page 260: ...up the operation of RAID systems disk drives computers and servers or other peripheral devices CD ROM Compact Disk Read Only Memory A removable read only storage device similar to an audio compact la...

Page 261: ...and AutoSwap Consistency Check Refers to a process where the integrity of redundant data is verified For example a consistency check of a mirrored drive will make sure that the data on both drives of...

Page 262: ...microprocessor DAC is an acronym for Disk Array Controller Data Transfer Rate The amount of data per unit time moved through a channel or I O bus in the course of execution of an I O load usually expr...

Page 263: ...cess running on the controller checks among other things elapsed time on all commands issued to disks A time out causes the disk to be reset and the command to be retried If the command times out agai...

Page 264: ...e each of the disks in the group will effectively have the capacity of the smallest member The total size of the drive group will be the size of the smallest disk in the group multiplied by the number...

Page 265: ...ng and attaches directly to a host s memory bus with no intervening I O adapter or I O bus EPROM Erasable Programmable Read Only Memory which can be erased and re used Ethernet The most widely install...

Page 266: ...tremeRAID 1100 provides the highest performance and most flexible RAID solution available today Failure A detectable physical change in hardware repaired by the replacement of the component Fast Ether...

Page 267: ...s and clustered storage devices It is also more flexible devices can be as far as ten kilometers about six miles apart The longer distance requires optical fiber as the physical medium However Fibre C...

Page 268: ...Interface Hard Disk Drive The main data storage unit of a computer HDD See Hard Disk Drive HDM Hardware Driver Module a driver set required for SCSI adapters for use in an I2O environment All Mylex SC...

Page 269: ...ive failure on a properly configured system where the data redundancy features of the controller are used system service continues without interruption A message is generated by the system to alert th...

Page 270: ...and storage controllers or storage devices I O intensive An application whose performance depends strongly on the performance of the I O system I Os per second Number of I O transactions per second I2...

Page 271: ...ntranet can also be used to facilitate working in groups and for teleconferences ISA Industry Standard Architecture A standard bus computer interconnection architecture associated with the IBM AT moth...

Page 272: ...stem drive Logical drives are presented to the operating system as available disk drives each with a capacity specified by the DAC960 Series controller LVD Low Voltage Differential Low Voltage Differe...

Page 273: ...he cached data and place it on the disk array Mirroring Refers to the complete duplication of data on one disk drive to another disk drive this duplication occurring simultaneously with each read and...

Page 274: ...in an offline state if no data can be read from it or written to it System commands issued to offline logical drives are returned with an error status no operations can be performed on offline logica...

Page 275: ...various software drivers PCI Hot Plug An essential feature in newer PCI based PCs which allows for the printed circuit board to be replaced without powering down the entire system Mylex DAC960PG DAC9...

Page 276: ...ent this technology to connect up to 15 SCSI devices per channel Several different forms of RAID implementation have been defined Each form is usually referred to as a RAID level All the RAID levels s...

Page 277: ...All data is 100 percent duplicated on a drive of equivalent size Level 3 Data is striped across several physical drives Maintains parity information which can be used for data recovery Level 5 Data i...

Page 278: ...nged regardless of the level of RAID installed The controller makes the physical configuration and RAID level implementation RAID Level Migration A features in RAID subsystems that allows for changing...

Page 279: ...S Federal Communications Commission FCC The most common telephone jack is the RJ 11 jack which can have six conductors but usually is implemented with four The RJ 11 jack is likely to be the jack that...

Page 280: ...rface that a computer uses to talk to and exchange data with your modem and other serial devices It is asynchronous 25 pin connector RS 422 423 Recommended Standard 422 423 a 32 pin serial connector t...

Page 281: ...and Fast Wide SCSI Ultra Wide SCSI and Ultra2 Wide SCSI support up to 15 devices on a channel SCSI Adapters Storage controllers for managing SCSI devices SCSI Drive A disk drive equipped with a SCSI i...

Page 282: ...lls that disk by changing its state to dead A SCSI drive in a dead state does not participate in any I O activity No commands are issued to dead drives Rebuild A SCSI disk drive is in a rebuild state...

Page 283: ...ime between any two consecutive system shutdowns System shutdown may be either a power off on or a hardware reset SIMM Single In Line Memory Module RAM packed on a small circuit board with a defined e...

Page 284: ...ched to the host system through a standard disk controller Storage Area Networking SAN A high speed open standard scalable network of storage devices and servers providing accelerated data access Stor...

Page 285: ...y ensuring a balanced load among all drives Sub system Storage A collection of disks providing data storage space to a system user Sustained Data Transfer Rate A rate of data transfer defined for cont...

Page 286: ...d of matching transmission impedance of a bus to eliminate signal reflections from the physical ends of the bus Thin File Server A small server maximized for the sole purpose of serving files as oppos...

Page 287: ...sed to a local area network LAN A wide area network may be composed entirely of private structures but the term seems to also connote the inclusion of public networks and all kinds of transmission med...

Page 288: ...g sent to the host operating system as soon as the cache not the disk drive receives the data to be written The target SCSI drive will receive the data at a more appropriate time in order to increase...

Page 289: ......

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