D-Link DSN-2100 xStack Storage User Manual Download Page 1

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xStack Storage

D-Link xStack Storage iSCSI SAN Arrays

Managed SAN Solutions

DSN-2100

User’s Guide

Version 2.0

Summary of Contents for DSN-2100 xStack Storage

Page 1: ...xStack Storage TM D Link xStack Storage iSCSI SAN Arrays Managed SAN Solutions DSN 2100 User s Guide Version 2 0 ...

Page 2: ... change without notice The only warranties for D Link products and services are set forth in the express warranty statements accompanying such products and services Nothing herein should be construed as constituting an additional warranty D Link shall not be liable for technical or editorial errors or omissions contained herein Copyright 2007 D Link Systems Inc Trademarks Adobe and Acrobat are tra...

Page 3: ... possible that you will never need to replace it However should you need to replace it consult your service documentation Do not dispose of the battery along with household waste Contact your local waste disposal agency for the address of the nearest battery deposit site Following are the safety agency certifications that the xStack Storage enclosure has met CSA 60950 1 UL 60950 1 IEC 60950 1 EN 6...

Page 4: ...ment Revision Level Revision Date Notes Version 1 0 August 10 2006 Version 2 0 September 17 2007 Version 2 0 replaces Version 1 0 Revisions include product functionality diagnostics out of box experience OOBE ...

Page 5: ...rating Software supported by this product Typographic Conventions Notes Notes provide information that deserves special attention They are preceded by Cautions Cautions contain information which if not followed can cause damage to the xStack Storage unit They are preceded by Warnings Warnings contain information which if not followed can cause damage to the xStack Storage unit and to the person in...

Page 6: ...y phone Tech Support for customers within the United States D Link Technical Support over the Telephone Please see our support site for current number http support dlink com Monday to Friday 8 00am 5 00pm PST PDT D Link Technical Support over the Internet http support dlink com Tech Support for customers within Canada D Link Technical Support over the Telephone Please see our support site for curr...

Page 7: ... Installing the xStack Storage Array in a Rack 30 3 7 Connecting to the xStack Storage DSN 2100 Host Network Connection Ports 30 3 8 Connecting to the xStack Storage Management Port 31 3 9 Connecting the Battery Pack 32 3 10 Connecting the Power Cords 33 3 11 Booting the xStack Storage Array 34 Chapter 4 Starting the xStack Storage Array for the First Time 35 4 1 Initial Startup and Welcome 35 4 2...

Page 8: ...ystem Date and Time 95 5 5 3 Changing Email Notification Setup 96 5 6 Managing xStack Storage Array Configurations 97 5 6 1 Saving the xStack Storage Array Configuration 97 5 6 2 Restoring the xStack Storage Array Configuration 98 5 6 3 Restoring Factory Defaults 99 5 7 Restarting the xStack Storage Array 99 5 8 Shutting Down the Management Console 100 5 9 Shutting Down the xStack Storage Array 10...

Page 9: ...ding Out of Box Settings 129 B 2 Recording Volumes 130 B 3 Recording iSCSI Initiators 131 B 4 Recording LAGs 132 B 5 Recording Network Portals 133 B 6 Recording iSCSI Target Nodes 134 B 7 Recording IP Routing Tables 135 B 8 Recording Scheduled Tasks 136 Appendix C Performing Advanced Diagnostics 137 C 1 Accessing the Serial Port Diagnostic Menu 137 C 2 Accessing the Management Port Diagnostic Menu...

Page 10: ...x Contents ...

Page 11: ...ller is housed in a 19 inch 2U rugged hardware enclosure holding up to 8 internal Serial ATA SATA drives up to 512MB of system memory and up to 4GB of cache buffer memory Host connectors for DSN 2100 are as follows Four 1GbE RJ 45 host connectors accessed via the rear panel The xStack Storage Array s rear panel also has a 10 100 Mbps management port and an RS 232 C DB9 diagnostic console port Comp...

Page 12: ...sis with 8 hot swappable drive bays Table 1 1 DSN 2000 xStack Storage Array Models Model Description DSN 2100 Maximum number of host network iSCSI connections Four RJ 45 ports Speed 1 Gigabit Ethernet 1 GbE Maximum number of internal SATA drives 8 Maximum amount of system memory 512MB Maximum amount of cache buffer memory 4GB ...

Page 13: ...ia the management port is encrypted using SSL without requiring configuration by the user Delivers Ethernet economics to storage for lower total cost of ownership and rapid deployment using known and trusted technologies Proven transport infrastructure for increased reliability investment protection and reduced training costs Scalability over long distances ideal for remote data replication and di...

Page 14: ...at is dedicated to the exchange of data between the network servers and the xStack Storage Array The high bandwidth used by the servers exchanging data with the xStack Storage Array can easily consume high bandwidth on the LAN Local Area Network where users PCs are attached Creating a separate network to isolate this traffic avoids bogging down the customer s existing LAN and helps improve securit...

Page 15: ...s describe the hardware components on the front of the xStack Storage Array enclosure Figure 2 1 shows the removable front bezel along with the drive bays and major components Figure 2 1 Front View of the xStack DSN 2000 Series Enclosure When installed the front bezel uses pipes to pass light from the LEDs behind it to the front for viewing The bezel itself is passive and has no active LEDs ...

Page 16: ...Power Blue ON Drive is powered and operational Green Blinking Data being transmitted or received from corresponding SATA drive Drive Activity and Fault Red ON Drive has experienced a fault and is offline 2 1 2 Key Lock and Latches Figure 2 1 shows the xStack Storage Array s front bezel with key lock and one latch This bezel can be locked in place to protect the system from unauthorized drive acces...

Page 17: ...ys and their numbering scheme from 0 through 7 2 1 3 1 Drive and Tray Removal A drive tray assembly can be removed by pressing upwards on the green latch found on the tray and removing it with the handle as shown in Figure 2 2 and Figure 2 3 Figure 2 2 Drive and Tray Removal Figure 2 3 Remove Drive Tray ...

Page 18: ...populated drive tray assembly can have unforeseen effects including the loss of all data in a volume A drive can be part of a volume that may or may not be redundant Before removing a drive from an operating xStack Storage Array make sure it is the correct one ...

Page 19: ...dicated in Step 2 of Figure 2 5 and push until it is seated firmly within the bay As you press you will see the tray handle begin to move inwards as the locking mechanism enters the locking slot When you see this then you must push the tray handle inwards as shown in Figure 2 6 until you hear the green locking mechanism click Figure 2 4 Drive Tray Installation Figure 2 5 Press Here Until You See t...

Page 20: ...20 Chapter 2 Identifying Hardware Components Figure 2 6 Press Lever Inwards Until it Locks ...

Page 21: ...that the unit only be operated with the top cover in place When installing the xStack Storage Array please be sure these vents are not blocked A fully loaded array with all drive bays filled can generate a significant amount of heat Please be sure the cover is in place to provide the forced air flow required for proper cooling 2 2 Back Panel Components The following sections describe the hardware ...

Page 22: ... Table 2 2 identifies the switches and their function Figure 2 8 Power and Reset Switches Table 2 2 Power and Reset Switches Function Switch Description Power Applies power to the xStack Storage Array Pressing this switch for longer than 3 seconds removes power from the xStack Storage Array and turns off the unit Reset Resets the xStack Storage Array ...

Page 23: ...rfaces The back of the xStack Storage DSN 2100 enclosure provide the following external interfaces Four 4 1GbE 1 Gigabit Ethernet RJ 45 host network connections One DB9 RS 232 C diagnostic port One RJ 45 Fast Ethernet management port Figure 2 9 shows the hardware components on the back of the xStack Storage DSN 2100 enclosure Figure 2 9 External Interfaces on the xStack Storage DSN 2100 Enclosure ...

Page 24: ...ort OFF Data is being sent or received at 10 Mbps Green Data is being sent or received at 100 Mbps RJ 45 Port Speed Yellow Data is being sent or received at 1 Gbps In addition the management port has two bicolor LED indicators that show the activity link and speed for this port Table 2 4 describes the management port LEDs and Figure 2 10 shows their location Table 2 4 Management Port LED Indicator...

Page 25: ...torage User s Guide 25 Figure 2 10 Management Port LED Locations 2 2 3 Rear Vents Figure 2 7 shows air vents that allow the exit of air through the rear of the chassis Please be sure these vents are not blocked ...

Page 26: ...26 Chapter 2 Identifying Hardware Components ...

Page 27: ...ots on the xStack Storage Array Install the xStack Storage Array in a fairly cool and dry location for the acceptable temperature and humidity ranges Install the xStack Storage Array in a site free from strong electromagnetic field generators such as motors vibration dust and direct exposure to sunlight For rack installation the following additional considerations must be observed The xStack Stora...

Page 28: ... by touching the metal part of the chassis Connect the clip to an unpainted surface of the chassis frame to safely channel unwanted ESD voltages to ground 3 3 Unpacking the xStack Storage Array After receiving the xStack Storage Array perform the following steps to ensure that it and other contents arrived safely To unpack the xStack Storage Array 1 Inspect the outer shipping container for any dam...

Page 29: ... address and Internet access that will act as the management console See Note 1 One or more available AC outlets not controlled by a wall switch Optional An Ethernet switch and Ethernet cable If you want to use the xStack Storage Array s Link Aggregation feature the switch must support LAGs xStack DSN 2100 Users A static IP address for each xStack Storage host connection RJ 45 data port that will ...

Page 30: ...rdware to the left and right sides of the xStack Storage Array Refer to the documentation for your mounting hardware and rack 3 With the assistance of another person hold the xStack Storage unit in place in the rack and secure with the mounting hardware Refer to the documentation for your mounting hardware and rack 4 Install the cables and power cords according to the procedures in the following s...

Page 31: ...installed in the PC that will be used to manage and monitor the xStack Storage unit 2 Connect the other end of the cable into the xStack Storage Mgmt Ethernet port Facing the back of the xStack Storage unit the management port is the rightmost RJ 45 connector To view this port on the xStack DSN 2100 see Figure 2 7 on page 21 If you want to configure the xStack Storage Array for email alert notific...

Page 32: ...ery pack to provide back up of the buffer cache contents See Figure 3 1 Since write back caching is always enabled on the xStack Storage Array we recommend you have a battery installed at all times The battery is attached to the controller board through a 3 pin connector at J 35 Figure 3 1 Battery Pack Installed on xStack Controller ...

Page 33: ...a power cord for each of the power supplies two redundant power modules use the following procedure 1 Plug the female end of the power cord into one of the three 3 pronged power connectors on the back of the xStack Storage unit 2 Plug the other end of the power cord into a working AC outlet that is not controlled by a wall outlet 3 Repeat steps 1 and 2 for the second power cord Figure 3 2 Power Su...

Page 34: ...d Fault Ready LED turns green the xStack Storage unit is ready for use When power is applied to the xStack Storage Array for the first time with a Web browser attached to the unit s management port the Out of Box Experience OOBE setup wizard is launched allowing you to specify initial settings Thereafter each subsequent time you start the xStack Storage Array the unit uses the initial settings alo...

Page 35: ...you start the OOBE 1 Connect a PC with an installed Web browser The IP address for the NIC in the management PC must be on the same IP subnet 192 168 1 x as the management port 2 Start a Web browser on the PC connected to the xStack Storage Array s management port 3 In the browser s address bar type the following default IP address for the management console and press the Enter key 192 168 1 1 4 S...

Page 36: ...nitial settings at a later time use the procedures described in Chapter 5 Figure 4 2 Management Port Screen Table 4 1 Initial Management Port Settings Setting Description IP Address Enter the IP address that client computers must use to access the xStack Storage Array s management console Make note of the new IP address for reference purposes Subnet Enter the subnet mask that client computers must...

Page 37: ...ext button when finished If you need to change these initial settings at a later time use the procedures described in Chapter 5 Figure 4 3 Administrator Account Screen Table 4 2 Administrator Account Settings Setting Description Password Enter the password for the administrator account This case sensitive password must be specified when logging in to the management console For security each typed ...

Page 38: ...rs This screen lets you specify the system date and time and time zone Complete the fields on this screen see Table 4 3 then click the Next button when finished If you need to change these initial settings at a later time use the procedures described in Chapter 5 Figure 4 4 Date Time Screen Table 4 3 Date Time Settings Setting Description Date and Time Use the controls to the right of this field t...

Page 39: ...old has been exceeded To use this feature the xStack Storage Array management port must be able to communicate with your LAN s Simple Mail Transfer Protocol SMTP server Complete the fields on this screen see Table 4 4 then click the Next button when finished To receive email notifications be sure that your SMTP server is set up correctly and that you are able to use it for your normal emails If yo...

Page 40: ... sent by the xStack Storage Array will be identified as being sent from this user To Enter the email address where notifications are to be sent This can be an individual email address or a distribution list 4 6 Completing the OOBE Setup Wizard After you click the Next button from the Email Notification screen a screen similar to the one in Figure 4 6 appears with a summary of the initial settings ...

Page 41: ...en similar to the one in Figure 4 7 appears and the xStack Storage Array restarts using the initial settings you specified If you changed the IP address for the management port the screen alerts you to change the settings on your management PC so you can access the xStack Storage Array console Figure 4 7 Restart Message ...

Page 42: ...42 Chapter 4 Starting the xStack Storage Array for the First Time ...

Page 43: ... directly to the xStack Storage Array management port see Section 3 8 The topics in this chapter include Section 5 1 Launching the xStack Storage Management Console on page 44 Section 5 2 Understanding the Main Screen on page 47 Section 5 3 Managing User Accounts on page 53 Section 5 4 Managing the xStack Storage Array on page 55 Section 5 5 Changing Initial Configuration Settings on page 94 Secti...

Page 44: ...dress is 192 168 1 1 If the xStack Storage Array is still in its boot up process and not fully operational then a screen similar to Figure 5 1 appears that monitors the process of the startup When the array has booted then the browser connects to the xStack Storage Array and a Login screen appears See Figure 5 2 If you receive an IP address not found message be sure you entered the appropriate IP ...

Page 45: ...xStack Storage User s Guide 45 Figure 5 1 xStack Storage Array Startup Screen Figure 5 2 xStack Storage Log in Screen ...

Page 46: ...46 Chapter 5 Configuring the xStack Storage Array Figure 5 3 xStack Storage Management Console Main Screen ...

Page 47: ...standing the Main Screen Figure 5 4 shows the areas of the xStack Storage Array s management console main screen Figure 5 4 Parts of the xStack Storage Management Console Main Screen Resources Pane Main Display Area Menu Tool Bar Area Footer ...

Page 48: ...t console application Menu bar The menu bar is located below the title bar The menu bar contains the menus you can select to perform a range of storage tasks The xStack Storage management console provides the following menus File View Storage Network Help Depending on the activity you are performing some menus may be gray and unavailable Tool bar The tool bar is located below the menu bar The tool...

Page 49: ...s double click the item or click the plus sign next to it When an item is expanded a minus sign replaces the plus sign Clicking the minus sign collapses the item In this Guide you will see references to the active tab The active tab is the tab that is on top in front of the other tab Only one tab can be active at a time To switch between the Physical Resources tab and the Logical Resources tab cli...

Page 50: ...ly by an xStack Storage Array Initializing a drive in the Unusable Collection moves it to the Available Pool where volumes can be rebuilt if necessary Blade A Base Pool Shows drives currently being used to hold volumes or ready to be used to hold volume data Available Pool Shows the available drives that can be added to the storage pool Initially all drives appear here until they are needed for us...

Page 51: ...yed in one or more tabbed screens in the main display area The tabbed screens resemble index cards If you click the top xStack Storage item in the left pane of either the Physical Resources tab for example four tabs appear in the main display area see Figure 5 7 You can then click the tab to view the information on it For more information about the screens that can appear in the main display area ...

Page 52: ...ent console window The footer shows status information when appropriate If you select Blade A Base Pool in the Logical Resources tab for example the words Blade A Base Pool appear in the footer see Figure 5 8 Figure 5 8 Example of Message in the Footer displays the selection in the Footer here Selecting Blade A Base Pool here ...

Page 53: ...eing able to add or edit user accounts Let a user add or edit other user accounts without being able to manage storage Limit a user to read only permissions that let the user view management console screens without being able to manage storage or add edit user accounts The admin account cannot be deleted in firmware version 1 4 0 27 and above For security please be sure to change the password for ...

Page 54: ...his user account The user must specify this case sensitive password when logging in to the management console For security each typed character appears as an asterisk Confirm password Retype the same case sensitive password typed in the Password field For security each typed character appears as an asterisk Allow to manage storage Check this option to let this user manage storage on the xStack Sto...

Page 55: ...olumes The iSCSI initiator node sees the volume as a contiguous series of numbered blocks called Virtual Logical Block Numbers VLBNs in the same way that it would see the storage space on a single disk drive The xStack Storage Array builds a volume from extents A volume typically consists of extents from several drives Volume can be organized in several ways see Table 5 2 Table 5 2 Ways to Organiz...

Page 56: ...administrator answers questions about the required redundancy size and usage characteristics of the volume The xStack Storage Array then determines the remaining parameters needed to allocate the storage space and create the volume As you create volumes record the information in Appendix B 1 In the Logical Resources tab click Blade A Base Pool 2 Perform one of the following steps in the Logical Re...

Page 57: ...e number of members increases slowly When maximum values are reached the xStack Storage Array uses all possible drives in the volume s pool and the Available Pool for a volume Spare count is the only limit to the number of drives obtained from the Available Pool 5 Click the Finish button The main screen reappears the volume you created appears under Blade A Base Pool in the Logical Resources tab a...

Page 58: ...e members Mirrored stripe organization with more stripe members Parity Parity organization with 3 members In combination with the Storage Efficiency Hint this selects Parity organization with more members In a mirrored stripe organization there are always two members for each stripe member to allow for the duplicate copy of the data After a volume is created you can use the Advanced tab to write p...

Page 59: ...the Storage menu click Manual Create Volume The Manual Create Volume Wizard launches and the Select Volume Type to Create screen appears see Figure 5 13 Figure 5 13 Manual Create Volume Wizard Select Volume Type to Create Screen 6 Complete the fields in the screen see Table 5 6 7 Click the Next button The Select the Drives screen appears see Figure 5 14 ...

Page 60: ...s support 2 to 15 drives You can select more than one drive in the left box To select contiguous drives click the first drive then hold down the Shift key and click the last drive All drives between the first and last drives are selected To select noncontiguous drives click the first drive then hold down the Ctrl key and click each additional drive you want to select To deselect a drive hold down ...

Page 61: ...ter the size of the volume you are creating MB GB TB etc Do not type a decimal point Use the drop down box to select the volume capacity Configuration Select the desired organization JBOD Stripe etc Table 5 2 lists the volume organizations Chunk Size Select the size 32K 64K etc of each chunk from one of the commonly used chunk sizes If you selected JBOD or Mirror as your configuration setting the ...

Page 62: ...he New Size slide bar to increase the size of the volume 4 Click OK 5 When the Expand Volume started message appears see Figure 5 16 click OK If the selected volume cannot support the specified size an error message appears If this occurs specify a smaller size Figure 5 16 Expand Volume Message ...

Page 63: ...screen in the Wizard the xStack Storage Array shows the values for the Volume s current organization Except for the Volume s Name which is shown in gray all fields can be changed For example you can change the Data Redundancy check box from None to Parity which would change the Volume s organization to Parity 3 Review the settings in the displayed screen and change them as necessary 4 Click the Fi...

Page 64: ...access to the volume and returns an error should any initiator try to write data If the Read Only selection is changed on this screen the change takes effect immediately 5 4 1 4 2 Disabling Sync Cache Commands Some applications that stream media such as video can suffer performance problems if the host file system sends the SCSI Sync Cache command repeatedly This command tells the xStack Storage A...

Page 65: ...sing the management console you can scan a parity volume for errors This task reads every block in the volume to ensure that parity is correct If parity errors are found this task corrects the errors 1 Click the volume on which you want to perform the parity scan 2 Perform one of the following steps On the Storage menu click Parity Scan Right click and click Parity Scan Either step starts the scan...

Page 66: ...ith which it will communicate 1 Perform one of the following steps in the Logical Resources tab Click Initiator Resources Then on the iSCSI menu click Add Initiator Right click Initiator Resources and click Add Initiator Either step displays the Create Initiator screen see Figure 5 19 Figure 5 19 Add Initiator Wizard Create Initiator Screen 2 Complete the fields in the screen see Table 5 7 3 Click...

Page 67: ...n IP address 5 4 3 1 Creating LAGs and VLANs By default each physical data port on the xStack Storage Array corresponds to a LAG DSN 2100 The default number of LAGs is eight DSN 3400 The default number of LAGs is one Since this model has only one data port it does not support LAG capabilities In the default configuration each data port corresponds to the LAG port of the same number For example the...

Page 68: ...ximum of 4 Gbps and the switch will balance the load Since a single initiator does not typically generate continuous data this configuration can allow better overall bandwidth utilization Figure 5 20 Example of Link Aggregation between the xStack Storage Array and a Gigabit Ethernet Switch Using the following procedure you can change this mapping so that a LAG consists of more than one physical po...

Page 69: ...This is a read only field Ethernet Encapsulation Select the Ethernet frame type to be used for fetching packets from upper layer protocols and placing header and footer information around the data before it traverses the network Ethernet_II Ethernet_802 3 VLAN Supported Check this box to have the LAG support a Virtual Network VLAN Auto Negotiation This option is unavailable 6 Click the Next button...

Page 70: ...select one or more ports in the left box and click Add to move them to the right box 8 To remove one or more Ethernet ports select them in the right box and click Remove to move it to the left box 9 When you finish adding Ethernet ports click the Finish button After you create LAGs you can monitor their status from the LAG Port Info screen see Section 6 14 ...

Page 71: ... click Modify LAG Parameters Right click and click Modify LAG Parameters Either step displays the Modify LAG Parameters screen see Figure 5 23 Figure 5 23 Modify Lag Parameters Dialog Box 3 Complete the fields in the screen see Table 5 9 4 Click OK Table 5 9 Modify LAG Parameters Screen Settings Setting Description MTU Size This value specifies the maximum size of a packet that can be transferred ...

Page 72: ...al port you want to configure 2 On the Network menu click Configure Physical Port The Add Remove Ethernet Ports for LAG Wizard starts and the Add Delete Ethernet Ports screen appears see Figure 5 24 Figure 5 24 Add Remove Ethernet Ports for LAG Wizard Add Delete Ethernet Ports screen 3 To add Ethernet ports select one or more ports in the left box and click Add to move them to the right box 4 To r...

Page 73: ...ork portal must have different IP addresses yet reside on the same subnet 5 4 4 1 Creating Network Portals The following procedure describes how to create network portals When you create a network portal you specify the IP address for each xStack Storage Array data port that will be communicating with your iSCSI initiator As you create network portals record the information in Appendix B Your iSCS...

Page 74: ...ddress Screen Settings Setting Description IP Address Enter the IP address for the network portal The IP address must be a unique address that is different than the management port and on the same subnet as the iSCSI initiator Subnet Mask Enter a subnet mask for the network portal or press the Tab key to automatically accept the default subnet mask Default Gateway If a router is required for the x...

Page 75: ...rmit access to the volumes on an xStack Storage Array by an initiator The xStack Storage Array supports up to 1024 iSCSI target nodes After you create one or more volumes iSCSI initiators and LAGs you have all the prerequisites to create an iSCSI target node As you create iSCSI target nodes record the information in Appendix B To create an iSCSI target node use the following procedure 1 In the Log...

Page 76: ...ate iSCSI connections check this box to enable the CHAP secret Then in the CHAP Secret field type the password that will be used by the xStack Storage Array to authenticate an initiator This setting is optional The CHAP secret is case sensitive For security each typed character in the CHAP secret appears as an asterisk If you decide not to specify a CHAP secret now you can do so in the future usin...

Page 77: ...ession Settings Tab 5 Accept the default settings in the Session Settings see Figure 5 28 and Connection Settings tabs see Figure 5 29 Figure 5 29 Create iSCSI Node Wizard Configure iSCSI Node Parameters Screen Connection Settings Tab 6 Click Next The Modify iSCSI Network Portal screen appears see Figure 5 30 ...

Page 78: ...al s allowed for this target node and click Add to move the IP address to the right list To select additional IP addresses repeat this step To remove an IP address from the right list click it and click Remove to return the address to the left list When you finish click Next The Initiators List screen appears see Figure 5 31 Figure 5 31 Create iSCSI Node Wizard Initiator List Screen ...

Page 79: ... Next The Volume Access Right screen appears see Figure 5 32 Figure 5 32 Create iSCSI Node Wizard Volume Access Right Screen 11 The left box lists all the volumes you have created Click a volume in this list then click Add to move the selected volume to the right box Note that all volumes currently can have only Read Write access which is the default You can select more than one volume in the left...

Page 80: ...d specify an optional CHAP secret If you did not you can use the following procedure to specify one You can also use this procedure to change the CHAP secret Record the information in Appendix B 1 Click a network entity prefaced by naa in the Logical Resources tab 2 On the iSCSI menu click Change CHAP Secret The Set CHAP Secret dialog box appears see Figure 5 33 Figure 5 33 Set CHAP Secret Dialog ...

Page 81: ... accept the log in if all of the following conditions are met The initiator s name is in the list of allowed initiators for that target node The initiator connected to the xStack Storage Array using an xStack Storage Array IP address and port number in the list of allowed network portals for that target node The CHAP secret if CHAP is enabled for the target node matches the one given by the initia...

Page 82: ...formed by the xStack Storage Array However you can change this setting if desired For example you may want to specify a higher default task priority for time critical tasks such as backups By changing the default task priority to a high priority the xStack Storage Array will spend more resources performing tasks and fewer resources performing I O for its initiators potentially decreasing its perfo...

Page 83: ...acket that the xStack Storage Array handles Using the management console you can view the xStack Storage Array s routing table If a route being used encounters problems you can use the management console to add route tables Adding a route is also useful if you discover a quick alternative route to the destination You can also use the management console to delete routes 1 On the View menu click Vie...

Page 84: ...subnet mask in defining routes the destination cannot be more specific than its corresponding subnet mask In other words there cannot be a bit set to 1 in the destination if the corresponding bit in the subnet mask is a 0 Gateway Specifies the forwarding or next hop IP address over which the set of addresses defined by the network destination and subnet mask are reachable For locally attached subn...

Page 85: ...cal Resources tab 2 Perform one of the following steps On the File menu click Modify System TCP IP Settings Right click and click Modify System TCP IP Settings Either step displays the Modify System TCP IP Settings dialog box appears with the current setting shown see Figure 5 38 Figure 5 38 Modify System TCP IP Settings Dialog Box 3 Complete the fields in the dialog box see Table 5 13 4 Click OK ...

Page 86: ... a volume on a failed drive If a drive fails the xStack Storage Array tries to find a replacement extent for every extent on that failed drive that was part of a redundant volume First a replacement extent is sought on a drive in the volume s pool currently the Blade A Base Pool If space is not found in that pool and a drive exists in the Available Pool one drive is obtained from the Available Poo...

Page 87: ...uirement by performing a reconfigure task on every volume that uses space on the drive This operation is conducted for any type of volume including redundant and non redundant organizations When all space has been moved off the drive the drive is moved to the Unusable Pool and can be removed from the system 5 4 12 1 Initiating the Down Drive Operation To use the Down Drive feature right click the ...

Page 88: ...manage both iSCSI and Fibre Channel devices an iSNS server can be used as a consolidated configuration point for an entire storage network The xStack Storage Array management console supports two iSNS configuration options The xStack Storage Array management console can use an iSNS server to discover all registered iSCSI Initiators and add them into the xStack Storage Array internal CIM database T...

Page 89: ...3205 5 4 13 2 Registering the xStack Storage Array with an iSNS Server To register the xStack Storage Array with an iSNS server use the following procedure 1 On the File menu click Configure System iSNS The Configure System iSNS dialog box appears see Figure 5 41 Figure 5 41 Configure System iSNS Dialog Box 4 Complete the fields in the dialog box see Table 5 15 5 Click OK The settings are saved an...

Page 90: ... as the iSNS server IP address though it may be different Heartbeat Subnet Mask Enter the subnet mask from which the iSNS heartbeat originates Typically this subnet mask is the same as the iSNS server subnet mask though it may be different 5 4 14 Creating Scheduled Tasks You can use the management console to set up tasks you want the xStack Storage Array to perform such as parity or media scans Wh...

Page 91: ...ct the volume on which the scheduled task will be performed Operation Select the task that is to be performed Perform this Task Select how often the scheduled task is to be performed Table 5 17 Scheduled Task Wizard Select Date and Time Screen Settings Setting Description Start Time Use the controls to specify the time when the scheduled task is to start Start Date Use the calendar to select the d...

Page 92: ... 5 44 The icon at the top of the dialog box provides a color coded indication of the xStack Storage Array battery status Figure 5 44 Battery Policy Dialog Box 3 Select the appropriate setting that the xStack Storage Array should whenever the battery is not fully charged see Table 5 18 4 Click OK Table 5 18 Battery Policy Settings Setting Description Ignore the status of the battery and do nothing ...

Page 93: ...the management console you can save the event log as an unformatted text file to a user specified folder 1 Be sure the Physical Resources tab is the active tab and select the Log Messages tab 2 Scroll the page down to make sure that all messages you want to save can be viewed 3 On the View menu click Save Event Log Messages The Open dialog box appears see Figure 5 45 Figure 5 45 Open Dialog Box 4 ...

Page 94: ...the xStack Storage Array for the first time If you need to change these settings perform the following procedure 1 Click the xStack Storage icon on the Physical Resources tab 2 Perform one of the following steps On the File menu click Configure Out of Band Port Right click and click Configure Out of Band Port Either step displays the Configure Out of Band Port dialog box see Figure 5 46 Figure 5 4...

Page 95: ...bnet mask that will take effect after the xStack Storage Array restarts Configure the NIC in the management PC to use the same subnet Host name after restart The xStack Storage Array is assigned a default host name If desired you can change this name to one that is meaningful to you Gateway after restart Enter the gateway that will take effect after the xStack Storage Array restarts 5 5 2 Changing...

Page 96: ...ct a date from the popup calendar System Time Use the controls to the right of this field to select the appropriate system time 5 5 3 Changing Email Notification Setup You may have specified email notification settings in the OOBE setup wizard when you started the xStack Storage Array for the first time If you need to change these settings or if you want to enable or disable this feature now perfo...

Page 97: ... IP address of the mail server through which email notifications from the xStack Storage Array will be routed SMTP Port Enter the SMTP port on which the mail server will be listening for email alerts from the xStack Storage Array default is 25 5 6 Managing xStack Storage Array Configurations The management console provides options for saving and restoring the xStack Storage Array configuration You...

Page 98: ...ore the saved configuration 1 On the File menu click Restore xStack Storage Configuration The Restore xStack Storage Configuration dialog box appears see Figure 5 50 Figure 5 50 Restore xStack Storage Configuration Dialog Box 2 Locate the configuration file whose settings you want to load then select the file and click the Open button The message in Figure 5 51 appears Figure 5 51 Configuration Re...

Page 99: ... or No the xStack Storage Array loads the factory default settings and those for the management port if you clicked Yes and displays the message to let you know that restore to factory defaults was successful 5 Click OK to restart the xStack Storage Array with the factory default settings When the xStack Storage Array restarts the first attempt to log in with a Web browser will run the Out of Box ...

Page 100: ...ically The following steps are the proper procedure for shutting down the xStack Storage Array Failing to use this procedure to shut down the xStack Storage Array will result in battery power degradation if a UPS is not used 1 Log off from all initiators 2 Click the xStack Storage icon on the Physical Resources tab 3 Perform one of the following steps On the File menu click System Shutdown Right c...

Page 101: ...xStack Storage User s Guide 101 ...

Page 102: ...e image Firmware Image Info screen 6 5 xStack Storage enclosure Enclosure Information screen 6 1 xStack Storage tasks Tasks Info screen 6 7 IP addresses and port numbers for a selected network entity Portals Info screen 6 15 iSCSI initiators Initiator Information screen 6 17 iSCSI initiators and access for a selected network entity Initiator Access Info screen 6 13 LAG ports LAG Port Info screen 6...

Page 103: ... messages are yellow Warning messages indicate that something appeared wrong but has been corrected They also provide notification about things that may be expected but are of particular interest Informational messages are green Informational messages contain information about steps performed detected version information and miscellaneous messages For more information about a message go to the Log...

Page 104: ...es tab you can use the Log Messages screen to view the entries in the event log see Figure 6 2 Figure 6 2 Log Messages Screen The messages are color coded making it easy to differentiate among informational warning and error messages The messages are time and date stamped with the most recent entry appearing at the top of the screen ...

Page 105: ...g is an example of an alarm message To obtain additional information about a message shown in the Log Messages screen double click the message A Log Message Details box appears with detailed information about the message The box also provides buttons for moving to the next or previous message in the message log and an OK button for exiting You can save the event log entries as an unformatted text ...

Page 106: ...sk is recurring and will repeat again in the future Figure 6 3 Tasks Info Screen To obtain additional information about a task shown in the Tasks Info screen double click the task A Task Message Details box appears with detailed information about the task If you right click a task in the Tasks Info screen a popup appears Depending on the options that are available you can perform the following tas...

Page 107: ...n the Physical Resources tab you can use the SMI Server Info screen to view Storage Management Initiative SMI server and profile information see Figure 6 4 The SMI Server Information area has an Edit button you can click to change the SMI server information if necessary Figure 6 4 SMI Server Information Screen ...

Page 108: ...u can use the Firmware Image Info screen to view the currently active firmware image being used by the xStack Storage Array see Figure 6 5 This screen also shows other valid firmware images that have been used with the xStack Storage Array For information about upgrading the xStack Storage Array firmware see Appendix E Figure 6 5 Firmware Image Info Screen ...

Page 109: ...nformation is a pie chart that provides a graphical representation of the amount of used and unused free space in the storage pool Used space is shown in gray and unused space is shown in green Below this information are rows that correspond to the drives attached to the xStack Storage Array Each row corresponds to a separate drive and shows the drive s Slot number State online offline etc For rea...

Page 110: ...7 Examples of tasks include media scan and drive initialization activities Each row of the Tasks Info screen corresponds to a task The last column Recurring shows whether the task is recurring and will repeat again in the future Figure 6 7 Tasks Info Screen To obtain additional information about a task shown in the Tasks Info screen double click the task A Task Message Details box appears with det...

Page 111: ...le shows information for a volume named dlink The Volume Information screen shows the following information see Figure 6 8 The volume s durable name and size volume state and cache status volume type storage efficiency and storage bandwidth and chunk size A graphical representation of the drives associated with the volume A LUN Map that shows the iSCSI target node s and LUN Number s Figure 6 8 Exa...

Page 112: ...ume The information shown for each task is see Figure 6 9 The task name The object volume assigned the task The task operation that is to be performed The progress of the task The status of the task The task s estimated completion time ECT Whether the task is recurring Figure 6 9 Tasks Info Screen To obtain additional information about a task shown in the Tasks Info screen double click the task A ...

Page 113: ...Viewing Information About Physical Drives When a drive is selected under Blade A Base Pool in the Logical Resources or when a drive is selected on the Physical Resources tab the Drive Information screen shows the following information about the selected drive see Figure 6 10 Drive number Vendor model Serial number Physical capacity State for example online or offline Microcode level ATA version Su...

Page 114: ... and displays it on the management console in tow collections This information consists of SMART data that serves as a summary of the overall status SMART attributes that are defined differently by each vendor To view SMART information for a drive select a drive under Blade A Base Pool in the Logical Resources or on the Physical Resources tab You can then use the second tab to view information col...

Page 115: ...xStack Storage User s Guide 115 Figure 6 12 Viewing SMART Attributes ...

Page 116: ...ng Target Node Information When a network entity is selected in the Logical Resources tab you can use the Target Node Info screen to view the session and connection parameters associated with the selected network entity Figure 6 13 Target Node Info Screen ...

Page 117: ...me Access Information When a network entity is selected in the Logical Resources tab you can use the Volume Access Info screen to view LUN map information for the volume associated with the selected network entity Figure 6 14 Volume Access Info Screen ...

Page 118: ...ator Access Information When a network entity is selected in the Logical Resources tab you can use the Initiator Access Info screen to view iSCSI initiator and access information associated with the selected network entity Figure 6 15 Initiator Access Info Screen ...

Page 119: ...on shows the following information LAG MAC port address Requested per port speed Aggregate LAG speed Link status Admin status Ethernet encapsulation VLAN support Auto negotiation MTU Ethernet Port This area shows the status of each Ethernet port associated with the LAG port To enhance viewing online ports are shown in green IP Address This area shows the IP addresses and corresponding VLAN IDs if ...

Page 120: ... Viewing Network Portal Information When a network entity is selected in the Logical Resources tab you can use the Portals Info screen to view the IP address and port number associated with the selected network entity Figure 6 17 Portals Info Screen ...

Page 121: ...Information If you select a connection in the Physical Resources tab you can use the Connection Information screen to view the connection parameters and session information for the selected connection see Figure 6 18 Figure 6 18 Connection Information Screen ...

Page 122: ...iSCSI Initiator Information When an iSCSI initiator is selected in the Logical Resources tab you can use the Initiator Information screen to view information associated with the selected iSCSI initiator see Figure 6 19 Figure 6 19 Initiator Information Screen ...

Page 123: ...Map Information When an iSCSI initiator is selected in the Logical Resources tab you can use the LUN Map Information screen to view LUN Map information associated with the selected iSCSI initiator see Figure 6 20 Figure 6 20 LUN Map Information Screen ...

Page 124: ...6 19 Viewing Ethernet Port Information When an Ethernet port is selected in the Physical Resources tab the main display area shows the physical port information for the selected Ethernet port see Figure 6 21 Figure 6 21 Physical Port Information ...

Page 125: ...useful for testing the network port connection to the network independent of any application in which the original problem may have been detected Pinging lets you determine whether further testing should be directed toward the network connection the lower layers or the application the upper layers If ping shows that packets can travel to the network and back the problem is probably in the upper la...

Page 126: ... management workstation connected to the xStack Storage Array management port To ping from the xStack Storage Array management port use the following procedure 1 Select the Physical Resources tab 2 On the File menu click Ping from Out of Band Port A dialog box similar to the one in Figure 7 2 appears 3 In the IP Address to Ping field enter the destination IP address of the management workstation 4...

Page 127: ...orage Array controller board Gateway After Restart 0 0 0 0 Table A 2 Battery Policy Default Setting Parameter Default Value If the battery fails the xStack Storage Array should Ignore the status of the battery and do nothing I have a UPS Table A 3 Date and Time Default Setting Parameter Default Value Timezone UTC Table A 4 Modify System TCPIP Default Settings Parameter Default Value Max Segment Si...

Page 128: ...rameter Default Value Number of Spare Counts 0 Table A 7 Modify iSCSI Port Default Setting Parameter Default Value New SCSI Port 3260 Table A 8 Email Notification Support Default Setting Parameter Default Value Enable Email Notification Support Disabled SMTP Server 0 0 0 0 SMTP Port 25 ...

Page 129: ...cording Out of Box Settings Use Table B 1 to record the initial settings you specify when you run the OOBE setup wizard Table B 1 Out of Box Settings Parameter Initial Setting Management Port Settings IP Address Subnet Default Gateway Host name Administrator Account Settings Admin Password Date Time Settings Date and Time Time Zone Email Notification Settings Enable Email Support SMTP Server IP Ad...

Page 130: ...lumes Use Table B 2 to record information about the volumes you create Table B 2 Volumes Created Using the xStack Storage Array Volume Name Volume Size Data Redundancy None Parity Mirror Chunk Size Configuration JBOD Stripe Mirror Mirrored Stripe Parity Allocated Drives ...

Page 131: ...er s Guide 131 B 3 Recording iSCSI Initiators Use Table B 3 to record information about the iSCSI initiators you create Table B 3 iSCSI Initiators Created Using the xStack Storage Array Initiator Name Initiator Password ...

Page 132: ...4 Recording LAGs Use Table B 4 to record information about the LAGs you create Table B 4 LAGs Created Using the xStack Storage Array LAG Number 1 2 MTU Size Ethernet Encapsulation VLAN Supported Yes or No Physical Ethernet Ports in This LAG Requested Speed ...

Page 133: ... Use Table B 5 to record information about the network portals you create Table B 5 Network Portals Created Using the xStack Storage Array LAG Number 1 2 MTU Size Ethernet Encapsulation VLAN Supported Yes or No Physical Ethernet Ports in This LAG Requested Speed ...

Page 134: ...SI Target Nodes Use Table B 6 to record information about the iSCSI target nodes you create Table B 6 iSCSI Target Nodes Created Using the xStack Storage Array iSCSI Node Alias Enable CHAP Secret Yes No CHAP Secret if Enabled Initiators Selected LUN Number and Access Mode ...

Page 135: ...135 B 7 Recording IP Routing Tables Use Table B 7 to record information about the IP routing tables you create Table B 7 IP Routing Tables Created Using the xStack Storage Array Network Destination Netmask Gateway Interface Metric ...

Page 136: ...Recording Scheduled Tasks Use Table B 8 to record information about the scheduled tasks you create Table B 8 Scheduled Tasks Created Using the xStack Storage Array Operation Name Object Operation Task Frequency Daily Weekly Monthly Once Start Time Start Date ...

Page 137: ...t know the login username and password For more information see Section C 2 C 1 Accessing the Serial Port Diagnostic Menu This method requires that you have physical access to the xStack Storage Array itself To access the xStack Storage Array serial port diagnostic menu use the following procedure 1 Shut down the xStack Storage Array 2 Connect a PC to the xStack Storage Array diagnostic serial por...

Page 138: ...ation After the new configuration is downloaded the Startup menu appears again Type 4 and press Enter to continue to start the xStack Storage Array To access the Enclosure Services Test Tool type 3 and press the Enter key To skip the serial port startup menu and continue with the startup operation type 4 and press the Enter key C 2 Accessing the Management Port Diagnostic Menu If the xStack Storag...

Page 139: ... management port diagnostic menu in Figure C 3 appears Figure C 3 Management Port Diagnostic Menu 5 From the management port diagnostic menu type the appropriate number for the option you want to perform 1 Reset the xStack Storage Array to factory default settings see Section C 2 1 2 Reboot or shut down the xStack Storage Array see Section C 2 2 3 Set the out of band port configuration see Section...

Page 140: ... 1 and press Enter A prompt asks whether you also want to reset the management port IP address see Figure C 4 Figure C 4 Prompt for Resetting the Management Port IP Address 2 To also reset the management port IP address to its default setting type y Otherwise type n 3 Press Enter A prompt asks whether you are sure you want to reset the xStack Storage Array to factory default settings see Figure C ...

Page 141: ...xStack Storage User s Guide 141 4 To reset to the factory default settings type y Otherwise type n 5 Press Enter The xStack Storage Array restarts ...

Page 142: ... enter the number of the desired option see Figure C 6 Figure C 6 Prompt for Rebooting or Shutting Down the xStack Storage Array 2 Perform one of the following steps To reboot the xStack Storage Array type 1 To shut down the xStack Storage Array type 2 To cancel the operation and return to the management port diagnostic menu type 3 3 Press Enter The xStack Storage Array performs the action that co...

Page 143: ...ddress and press Enter You are prompted for a subnet mask 3 To keep the current subnet mask for the management port press Enter Otherwise enter a new subnet mask and press Enter You are prompted for a gateway 4 To keep the current gateway press Enter Otherwise enter a new gateway and press Enter You are prompted for a hostname 5 To keep the current hostname press Enter Otherwise enter a new hostna...

Page 144: ...er supplies D 1 Installing the Battery Pack The xStack Storage Array accommodates a 4 cell or 6 cell shrink wrapped battery pack Because write back caching is always enabled we recommend you have a battery to back up the buffer cache contents To install a battery in your xStack Storage SAN Array follow these steps 1 Hold the battery as shown to align the fastener pad Make sure the battery cable an...

Page 145: ...s shown in Figure D 2 until you feel it lock into place Figure D 2 Press the Battery Down Firmly Until it Locks 3 Align the battery plug with connector J35 as shown in Figure D 3 and insert it fully into the socket Figure D 3 Align the Battery Plug with Connector J35 ...

Page 146: ...apter 2 Identifying Hardware Components 4 The connector locked firmly into connector J35 Figure D 4 Battery Plug Locked in Place 5 The installed battery is shown in Figure D 5 Figure D 5 The Installed Battery ...

Page 147: ...least 512MB 2 x 256MB modules installed This should work well for most applications However several applications such as video streaming of the product could benefit from increased cache memory Please see Figure D 6 for buffer memory location Note on Memory The xStack Storage controller s system and buffer memory must be installed as matching pairs Table D 1 lists the specifications for DIMMs supp...

Page 148: ...DIMMs that use 4 bit wide DRAMs do not provide DM signals and cannot be used Registered DIMMs must be registered as per the JEDEC specification for registered DIMMs Buffered DIMMs must be buffered as per the JEDEC specification for buffered DIMMs Organization Conforming DIMM organizations are shown in Table D 2 Table D 2 DIMM Organization DIMM 0 J36 System Memory Module DIMM 1 J37 System Memory Mo...

Page 149: ...e part of a volume that may or may not be redundant Before removing a drive from an operating xStack Storage Array make sure it is the correct one D 3 1 Drive and Tray Removal A drive tray assembly can be removed by pressing upwards on the green latch found on the tray and removing it with the handle as shown in Figure D 7and Figure D 8 Figure D 7 Drive and Tray Removal Figure D 8 Remove Drive Tra...

Page 150: ...s to install a hard drive in a drive tray 1 Remove the plastic air dam from the tray by squeezing the two levers together and lifting the piece out of the tray as shown in Figure D 9 Figure D 9 Removing the Plastic Air Dam Piece 2 Your tray should now look like Figure D 10 Figure D 10 Tray with Air Dam Removed ...

Page 151: ...ive in tray as shown in Figure D 11 Figure D 11 Place Hard Drive in Tray 4 Align the mounting holes and insert four mounting screws to hold the drive securely in the drive tray as shown in Figure D 12 Figure D 12 Secure the Hard Drive in the Drive Tray ...

Page 152: ...n drive bay as shown in Figure D 13 Push the tray at the point indicated in Step 2 of Figure D 14 and push until it is seated firmly within the bay As you press you will see the tray handle begin to move inwards as the locking mechanism enters the locking slot When you see this then you must push the tray handle inwards as shown in Figure D 15 until you hear the green locking mechanism click Figur...

Page 153: ...xStack Storage User s Guide 153 Figure D 14 Press Here Until You See the Lever Move Inwards Figure D 15 Press Lever Inwards Untill it Locks ...

Page 154: ...eplaceable fans They can be replaced as follows 1 Locate the failed fan They can be identified by their green handle as seen in Figure D 16 Figure D 16 A User Replaceable Fan with Green Handle 2 Lift the handle grasp it and pull the fan upwards as seen in Figure D 17 Figure D 17 Lift the Handle and Pull Upwards ...

Page 155: ...ve the fan from its socket as seen in Figure D 18 Figure D 18 Remove the Fan 4 Insert the new fan by reversing the previous steps i e Insert fan into socket press firmly downwards until it is seated and lower the handle to lock it in place ...

Page 156: ... 1 Locate the failed power supply module Unscrew the bolt holding the locking mechanism in place as shown in Figure D 19 Figure D 19 Unscrew the Bolt Holding the Locking Mechanism 2 Push the locking lever to the left and pull on the handle as shown in Figure D 20 Figure D 20 Push the Locking Lever to the Left and Pull Handle 3 Remove the power supply module as shown in Figure D 21 ...

Page 157: ...1 Remove the Power Supply Module 4 Insert the new power supply module by reversing the previous steps i e Insert the new power supply module into the bay until it seats against the rear and the lever locks Then screw the locking bolt into place ...

Page 158: ...158 Appendix D Replacing and Upgrading FRUs ...

Page 159: ...the file to a desired location On a piece of paper write the location and folder where you download the firmware file You will need to access this location later in this procedure Temporarily turn off any internal firewall software found on your management PC Failure to do so will cause the firmware upgrade to fail 6 Launch the xStack Storage Web Manager 7 On the View menu click Firmware Upgrade T...

Page 160: ...f the installation 11 After the firmware is installed a message prompts you to press OK to restart the xStack Storage to have the new firmware take effect 12 Click OK to restart the xStack Storage If additional messages appear click OK to remove them 13 After the xStack Storage restarts launch your Web browser again and log in to the xStack Storage management console The Firmware Image Info screen...

Page 161: ...ser s Guide 161 Appendix F Hardware Enclosures This appendix shows samples of hardware enclosures for the xStack Storage F 1 Front View Figure F 1 Front View of Enclosure F 2 Back View Figure F 2 Rear View of Enclosure ...

Page 162: ...162 Appendix F Hardware Enclosures ...

Page 163: ...Force The main standards organization for the Internet The IETF is a large open international community of network designers operators vendors and researchers concerned with the evolution of the Internet architecture and the smooth operation of the Internet It is open to any interested individual Initiator node An iSCSI node that performs as an iSCSI Initiator in accessing data stored on the xStac...

Page 164: ...ogical Unit In the xStack Storage a logical unit is a volume MAC Address Media Access Control address A hardware address that uniquely identifies each node of a network Member A group of chunks organized vertically in an array Mirror A method for improving reliability of a Volume by providing data redundancy In a mirror volume data redundancy is provided by recoding every data block on more than o...

Page 165: ...y to improve I O performance on a volume by splitting data among multiple drives Storage pool A collection of drives used as a group for common functions for example the space used by a volume must be allocated from a specific storage pool Subnet A portion of a network that shares a common address component On TCP IP networks subnets are defined as all devices whose IP addresses have the same pref...

Page 166: ...166 Appendix G Acronyms and Abbreviations ...

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