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SAS RAID controllers for IBM i

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Содержание SAS RAID controllers

Страница 1: ...Power Systems SAS RAID controllers for IBM i ...

Страница 2: ......

Страница 3: ...Power Systems SAS RAID controllers for IBM i ...

Страница 4: ... Notices manual G229 9054 and the IBM Environmental Notices and User Guide Z125 5823 This edition applies to IBM Power Systems servers that contain the POWER7 processor and to all associated models Copyright IBM Corporation 2010 2013 US Government Users Restricted Rights Use duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp ...

Страница 5: ...ns 28 Dual storage IOA access optimization 28 Installing dual storage IOA configurations 30 SAS RAID controller maintenance 31 Rechargeable battery maintenance 32 Displaying rechargeable battery information 32 Error state 34 Forcing a rechargeable battery error 34 Replacing a battery pack 35 Replacing a 572B nonconcurrent maintainable battery pack 36 Replacing a 572F 575C card set concurrent maint...

Страница 6: ...iv SAS RAID controllers for IBM i ...

Страница 7: ...uct The documentation contains the safety information in your national language with references to the U S English source Before using a U S English publication to install operate or service this product you must first become familiar with the related safety information documentation You should also refer to the safety information documentation any time you do not clearly understand any safety inf...

Страница 8: ...ny equipment that will be attached to this product to properly wired outlets v When possible use one hand only to connect or disconnect signal cables v Never turn on any equipment when there is evidence of fire water or structural damage v Disconnect the attached power cords telecommunications systems networks and modems before you open the device covers unless instructed otherwise in the installa...

Страница 9: ...he customer to ensure that the outlet is correctly wired and grounded to prevent an electrical shock CAUTION v Do not install a unit in a rack where the internal rack ambient temperatures will exceed the manufacturer s recommended ambient temperature for all your rack mounted devices v Do not install a unit in a rack where the air flow is compromised Ensure that air flow is not blocked or reduced ...

Страница 10: ...ou choose can support the weight of the loaded rack cabinet Refer to the documentation that comes with your rack cabinet for the weight of a loaded rack cabinet v Verify that all door openings are at least 760 x 230 mm 30 x 80 in v Ensure that all devices shelves drawers doors and cables are secure v Ensure that the four leveling pads are raised to their highest position v Ensure that there is no ...

Страница 11: ... This product might contain one or more of the following devices CD ROM drive DVD ROM drive DVD RAM drive or laser module which are Class 1 laser products Note the following information v Do not remove the covers Removing the covers of the laser product could result in exposure to hazardous laser radiation There are no serviceable parts inside the device v Use of the controls or adjustments or per...

Страница 12: ...03 Power and cabling information for NEBS Network Equipment Building System GR 1089 CORE The following comments apply to the IBM servers that have been designated as conforming to NEBS Network Equipment Building System GR 1089 CORE The equipment is suitable for installation in the following v Network telecommunications facilities v Locations where the NEC National Electrical Code applies The intra...

Страница 13: ...Memory Access DMA engine and hardware finite field multiplier FFM DMA engine for RAID 6 v Support nonvolatile write cache for RAID disk arrays on some adapters PCIe2 and PCIe3 adapters feature Flash Backed DRAM which eliminates the need for rechargeable batteries v Support for RAID 5 and RAID 6 disk arrays and system mirroring v Support for attachment of other devices such as non RAID disks tape a...

Страница 14: ...x connectors and 2 top mini SAS 4x connector for high availability only 81 RAID levels supported RAID 5 6 system mirroring RAID 5 6 system mirroring RAID 53 RAID 63 system mirroring System mirroring RAID 5 RAID 6 system mirroring RAID 5 RAID 6 system mirroring Write cache size 175 MB 175 MB Up to 1 5 Gb compressed 175 MB Read cache size Up to 1 6 Gb compressed Cache battery pack technology LiIon L...

Страница 15: ...Figure 1 CCIN 572A PCI X266 External Dual x4 3 Gb SAS adapter Figure 2 CCIN 57B8 planar RAID enablement card SAS RAID controllers for IBM i 3 ...

Страница 16: ...Figure 3 CCIN 572F PCI X266 Ext Tri x4 3 Gb SAS RAID adapter and CCIN 575C PCI X266 auxiliary cache adapter Figure 4 CCIN 2BE1 PCI X266 Planar 3 Gb SAS adapter 4 SAS RAID controllers for IBM i ...

Страница 17: ...oller card comparison Features 2B4C 574E 57B3 57B7 Description PCIe x4 Internal 3 Gb SAS RAID adapter PCIe x8 Ext Dual x4 3 Gb SAS RAID adapter PCIe x8 Ext Dual x4 3 Gb SAS adapter PCIe x1 Auxiliary Cache adapter Form factor Planar unique PCIe PCIe x8 PCIe x8 Planar Auxiliary Cache Physical links 6 two 2x wide ports to shared SAS drives and one 2x wide port to 57CB 8 two mini SAS 4x connectors 8 t...

Страница 18: ...ment card Physical links 8 8 two 2x wide ports to shared SAS drives and one 2x wide port to 2B4F one physical link to DVD and optionally one physical link to tape drive 4 one direct SAS physical link to each integrated SSD 8 RAID levels supported RAID 51 RAID 61 system mirroring RAID 5 RAID 6 system mirroring RAID 5 RAID 6 system mirroring RAID 5 RAID 6 system mirroring Write cache size 175 MB 175...

Страница 19: ...Figure 6 CCIN 57CF PCI Express x8 Planar 3 Gb SAS RAID adapter with 175 MB Cache RAID Dual IOA Enablement card Figure 7 CCIN 57B7 Planar Auxiliary Cache SAS RAID controllers for IBM i 7 ...

Страница 20: ...Figure 8 CCIN 57B3 PCIe x8 Ext Dual x4 3 Gb SAS adapter Figure 9 CCIN 574E PCIe x8 Ext Dual x4 3 Gb SAS RAID adapter 8 SAS RAID controllers for IBM i ...

Страница 21: ...ual storage I O adapter IOA configuration to connect multiple controllers to a common set of disk expansion drawers and the included disks and disk arrays Figure 10 CCIN 57CD PCIe SAS RAID and SSD adapter 3 Gb x8 Figure 11 CCIN 2B4C PCIe x4 Planar 3Gb SAS RAID adapter SAS RAID controllers for IBM i 9 ...

Страница 22: ...HD 4x connectors Supported RAID levels RAID 5 RAID 6 system mirroring RAID 5 RAID 6 system mirroring RAID 5 RAID 6 system mirroring RAID 5 RAID 6 system mirroring Write cache size 1 8 GB 1 8 GB 3 1 GB Read cache size Cache battery pack technology None uses supercapacitor technology None uses supercapacitor technology None uses supercapacitor technology Cache battery concurrent maintenance Cache da...

Страница 23: ...Figure 12 CCIN 57B5 PCIe2 1 8 GB cache RAID SAS adapter Tri port 6 Gb Figure 13 CCIN 57C4 PCIe2 RAID SAS Adapter Dual port 6 Gb SAS RAID controllers for IBM i 11 ...

Страница 24: ...Figure 14 CCIN 57C3 PCIe2 3 1 GB Cache RAID SAS Enclosure 6 Gb x8 Figure 15 CCIN 57BB PCIe2 1 8 GB cache RAID SAS adapter Tri port 6 Gb 12 SAS RAID controllers for IBM i ...

Страница 25: ... uses supercapacitor technology Cache battery concurrent maintenance Cache data present LED Removable cache card Auxiliary write cache AWC support No No Dual storage IOA configuration Yes Yes Requires dual storage IOA configuration No Yes SAS tape support Yes1 No SAS DVD support Yes1 3 No 520 byte virtual disk support Yes Yes Notes 1 SAS tape and SATA DVD are only supported in a single adapter con...

Страница 26: ...al links are a set of four wires used as two differential signal pairs One differential signal transmits in one direction while the other differential signal transmits in the opposite direction Data can be transmitted in both directions simultaneously Physical links are contained in SAS ports which contain one or more Figure 17 CCIN 57B4 PCIe3 RAID SAS adapter Quad port 6 Gb x8 four units Figure 1...

Страница 27: ...refers to the summation of all paths between all SAS controller ports and all I O device ports in the SAS subsystem including cables enclosures and expanders The following example SAS subsystem shows some of the concepts described in this SAS overview A controller is shown with eight SAS physical links Four of those physical links are connected into two different wide ports One connector contains ...

Страница 28: ...ntroller supports RAID levels 5 and 6 as well as system mirroring Not all controllers support all RAID levels Each RAID level supported by the controller has its own attributes and uses a different method of writing data The following information provides details for each supported RAID level Related concepts PCI X SAS RAID card comparison on page 2 Use the table in this topic to compare the featu...

Страница 29: ...locks on the operational disks If a second disk fails the array is placed in the failed state and is not be accessible Related information RAID 5 concepts RAID 6 Learn how data is written to a RAID 6 array RAID 6 stripes data across all disks in the array RAID level 6 also writes array P and Q parity data The P and Q parity data is spread across all the disks For a RAID 6 array of four disks array...

Страница 30: ...bus A greater number of disk units provides more opportunity for failure and increased recovery time Refer to Mirrored protection for more information Disk array capacities These guidelines help you calculate the capacity of a disk array The capacity of a disk array depends on the capacity of the disks that are used and the RAID level of the array To calculate the capacity of a disk array use the ...

Страница 31: ...te software support must be installed The requisite software for the adapter is often preinstalled during IBM i installation It might be necessary to perform operations related to the installation verification and maintenance of the IBM i software support for the adapter Software for the adapter is packaged in Program Temporary Fix PTF format and distributed as part of the base IBM i installation ...

Страница 32: ...BM i 6 1 1 or later1 1 See the PCI adapter information by feature type topic in Managing PCI adapters for the minimum IBM i level requirements It might become necessary to install software updates so that you have the latest available level of adapter software support Updates to the adapter software support are packaged distributed and installed through the same mechanisms that are used for other ...

Страница 33: ... use a spinning magnetic platter to store nonvolatile data in magnetic fields SSDs are a storage device using nonvolatile solid state memory typically flash memory to emulate HDDs HDDs have an inherent latency and access time caused by mechanical delays in the spinning of the platter and movement of the read write head SSDs greatly reduce the latency and time to access the stored data The nature o...

Страница 34: ...e various PCI Express PCIe SAS RAID cards for IBM i There are also images of adapters for you to view Possible disk storage IOA configurations This topic shows a table illustrating what is needed to have dual storage IOA configurations with RAID or operating system mirroring and images of dual storage IOA configurations Table 8 Disk protection with dual storage This table describes what is needed ...

Страница 35: ...ge IOA function requires controller and IBM i software support Controller support is shown in the feature comparison tables for PCIe and PCI X cards Look for controllers that have Dual Figure 22 Dual storage IOA RAID configuration Figure 23 Dual storage IOA system mirroring configuration SAS RAID controllers for IBM i 23 ...

Страница 36: ... related to problems with a disk array Disk array errors might also be logged on the secondary controller if a disk array is optimized on the secondary controller at the time the error occurred Typical reasons for the primary and secondary controllers to switch roles from what was expected are as follows v Controllers switch roles for asymmetric reasons For example one controller detects more disk...

Страница 37: ...sed functionally but these disks can be formatted to 528 bytes per sector 2 The operating mode can be viewed by using the Auxiliary Storage Hardware Resource Detail display Viewing dual storage IOA attributes This topic collection provides the details for using the Auxiliary Storage Hardware Resource Detail display to obtain dual storage I O adapter IOA configuration information Perform the follow...

Страница 38: ...System bus 517 System board 0 System card 0 Storage I O adapter Not used I O bus 127 Controller Device Operating mode Primary Storage IOA More F3 Exit F5 Refresh F6 Print F9 Change detail F12 Cancel F14 Dual Storage IOA Configuration 7 Press F14 Dual Storage IOA Configuration to view a list of both adapters in the dual storage IOA pair This is an example of the display 26 SAS RAID controllers for ...

Страница 39: ...ect cabling is required to provide redundancy between each adapter and the disk expansion drawer Follow these guidelines when you cable your system v For RAID configurations on a 5887 EXP 24S SFF generation 2 bay drawer X or Y cables are used depending on the type of adapter and mode setting of the disk expansion drawer This criteria is to provide redundancy for the SAS ports between each controll...

Страница 40: ... 5 and RAID 6 Dual storage IOA access optimization View the active or passive path of your disk units and controller Dual storage IOA access characteristics can balance the controller workload The dual storage IOA access characteristics for a disk array parity set specifies which controller is preferred to be optimized for the disk array It performs direct read and write operations to the physical...

Страница 41: ...l Name Status Y6800024F78E 433C 099 DMP001 Active DMP002 Passive Y680002AEB3D 433C 099 DMP003 Active DMP004 Passive Y6800024F754 433C 099 DMP005 Active DMP006 Passive Y6800024F771 433C 099 DMP007 Active DMP008 Passive Y68000268517 433C 099 DMP009 Active DMP010 Passive Y680002B31DD 433C 099 DMP011 Active DMP012 Passive Y6800024F74D 433C 099 DMP013 Active DMP014 Passive More Press Enter to continue ...

Страница 42: ...P014 Disk Unit 433C 099 Passive DMP016 Disk Unit 433B 099 Passive DMP018 More F3 Exit F5 Refresh F6 Print F8 Include non reporting resources F9 Failed resources F10 Non reporting resources F11 Display status resource name F12 Cancel Related concepts Dual storage IOA functions on page 23 Consider these factors when using dual storage I O adapter IOA functions Installing dual storage IOA configurati...

Страница 43: ...our system correctly is one of the most important aspects of planning for a dual storage I O adapter IOA configuration For RAID configurations that have disk expansion drawers correct cabling is required to provide redundancy between each adapter and the disk expansion drawer Dual storage IOA access optimization on page 28 View the active or passive path of your disk units and controller Related t...

Страница 44: ...angular card with round button shaped batteries for a removable cache card The nonvolatile write cache memory is integrated into the controller The write cache memory itself is battery backed by the large rechargeable cache battery pack The cache directory card contains only a secondary copy of the write cache directory and no cache data Do not remove this card except under specific recovery cases...

Страница 45: ...IN of the selected controller Unit ID Enclosure feature identifier containing the selected controller Planar ID Planar identifier containing the selected controller Card Physical card slot identifier containing the selected controller Battery Type The type of rechargeable cache battery pack Battery State Indicates if an error condition currently exists related to the rechargeable cache battery pac...

Страница 46: ...orcing the battery error results in the following v The system logs an error v Data caching becomes disabled on the selected controller v System performance could become significantly degraded until the cache battery pack is replaced and charging of the new battery pack has completed The new battery pack may take several hours to charge v The battery pack can be safely replaced field on the contro...

Страница 47: ...ture descriptions and the figures in the Replacing a battery pack section to determine if your adapter has a cache data present LED and the location of the LED 6 Replace the cache battery pack using the procedure that sent you here For a list of replacement procedures see Replacing a battery pack 7 Restart the adapter s write cache by doing the following a Return to the Work with Resources contain...

Страница 48: ...nces to information about maintaining the rechargeable battery on the SAS adapters for systems or logical partition that run on the AIX IBM i or Linux operating systems v For information about maintaining the rechargeable battery for systems that run on the AIX operating system see Maintaining the rechargeable battery on the 57B7 57CF 574E and 572F 575C SAS adapters v For information about maintai...

Страница 49: ...ll enough that it does not slide over the rivet and contact the battery assembly bracket b Slide the card off the edge of the work area enough so rivet C can be pressed out of the back of the adapter c Hold the pen with the ballpoint retracted place the pen on top of rivet C and gently press straight down until rivet C presses out d Repeat steps 5b and 5c for the other rivet C e Remove the cache b...

Страница 50: ...e LED details and its location To replace a 572F 575C concurrent maintainable battery pack complete the following steps 1 Using the following illustration to locate the battery components locate the metal cover A that holds the battery pack Pull out on the push rivet B to release the metal cover A 2 Remove the battery unit by pulling on tab C Note Ensure that the cache battery pack is disconnected...

Страница 51: ...he following figures to determine whether your adapter has a cache data present LED and its location To replace a 574E concurrent maintainable battery pack complete the following steps 1 Using the following illustration to locate the battery components verify that the cache data present LED C is not flashing If it is flashing do not continue return to Forcing a rechargeable battery error 2 Squeeze...

Страница 52: ...ace the cache battery pack when Yes is displayed next to Battery pack can be safely replaced If the cache data present LED is flashing do not replace the cache battery pack or the cache data is lost See the feature comparison tables for PCIe and PCI X cards and the following figures to determine whether your adapter has a cache data present LED and its location To replace a 57B7 concurrent maintai...

Страница 53: ...tor 5 Slide the new cache battery pack into the mounting guides on the controller until it is seated in the battery connector 6 After the battery is seated in the connector move the lever to the latched position to fully seat the battery into the connector 7 Restart the write cache of the adapter by completing the following steps a Navigate to the IBM SAS Disk Array Manager by using the steps in U...

Страница 54: ...vice considerations Before servicing or installing any features review the I O configurations for each logical partition on your system It is important to understand the differences between the various configurations and the resulting service considerations In addition consider possible impacts to the following areas v Logical partitions and their I O adapter assignments v RAID array configuration...

Страница 55: ...the hole in the mounting tab Repeat this step for the second standoff Note v The battery is mounted on a black plastic plate with two tabs secured by white plastic standoffs with the retaining tabs v If the retaining tab is difficult to push in turn the white standoff so its retaining tab faces away from the battery pack 5 Install the battery on to the posts until the latches click into place Figu...

Страница 56: ...en the maintenance procedures direct you to separate the 572F 575C card set and move the cache directory card on a 572F controller for recovery purposes carefully follow this procedure Important To avoid loss of cache data do not remove the cache battery during this procedure Notes v This procedure should only be performed if directed from an isolation procedure or a maintenance analysis procedure...

Страница 57: ...o prevent possible card damage loosen all five retaining screws C before removing any of them After all five retaining screws have been loosened remove the screws C from the 572F storage adapter Important Failure to loosen all five retaining screws prior to removing any of the screws can result in damage to the card C Screws Figure 32 572F 575C card set adapter Figure 33 Location of screws on the ...

Страница 58: ...e the cache directory card D on the 572F storage adapter The cache directory card is the small rectangular card mounted on the I O card D Cache directory card 6 Unseat the connector on the cache directory card by wiggling the two corners that are farthest from the mounting pegs To disengage the mounting pegs pivot the cache directory card back over the Figure 34 Location of interconnect connector ...

Страница 59: ...er When connecting the two adapters together carefully align guide pins B on each side of the interconnect connector A After the connector is seated correctly apply pressure to completely squeeze the connector together To prevent possible card damage insert all five screws C before tightening any of them Figure 36 Unseating the connector Figure 37 Reassembling the cards SAS RAID controllers for IB...

Страница 60: ...his ends this procedure Replacing an SSD module on the PCIe RAID and SSD SAS adapter Use this procedure to replace an integrated solid state drive SSD on a PCIe serial attached SCSI SAS RAID and SSD Adapter Complete the following steps to perform a nonconcurrent SSD replacement on a PCIe SAS RAID and SSD adapter Note When an SSD on the PCIe adapter fails the entire adapter must be removed from the...

Страница 61: ... the 5802 or 5803 expansion unit use the nonconcurrent procedure 2 Place the adapter on a surface that is electrostatic discharge protected 3 Lift the lever A for the SSD that you are replacing to a fully vertical position Note Each of the levers A undocks two SSDs at a time 4 With the lever A in the vertical position firmly push the lever A away from the adapter tailstock to undock the two SSDs f...

Страница 62: ...er of the SSD divider and then lifting it to a fully vertical position 6 Using the device access finger openings C push the single SSD that you are replacing out of the device holder Figure 40 Pushing the lever away from the adapter tailstock Figure 41 Lifting the device retaining latch 50 SAS RAID controllers for IBM i ...

Страница 63: ... return to that procedure Viewing SAS fabric path information Use the Hardware Service Manager to view details of the SAS fabric information Perform the following steps to view the SAS fabric information 1 Start the Hardware Service manager and page forward to the second selection screen 2 Select SAS Resource Path Information 3 Enter 1 in front of the required adapter resource to display resource ...

Страница 64: ...llowing is an example for Display SAS fabric path graphical view An alternative view can be displayed by selecting F11 SAS Fabric Path Data View Following is an example of SAS Fabric Path Data View Figure 43 SAS resource path information Figure 44 SAS fabric path graphical view 52 SAS RAID controllers for IBM i ...

Страница 65: ...id The SAS node is incorrectly connected Unknown Unknown or unexpected status 1 This status is an indication of a possible problem however the controller is not always able to determine the status of a node The node can have this status even when the status or node is not displayed Example Using SAS fabric path information This data becomes helpful in determining the cause of configuration or SAS ...

Страница 66: ...ys information similar to the following For Display SAS fabric path graphical view choosing one of the devices with the Failed path displays information similar to the following Figure 46 Cascaded disk enclosure 54 SAS RAID controllers for IBM i ...

Страница 67: ...s and physical location information Many hardware error logs identify the location of a physical device such as a SAS disk using the unit address The unit address format is cceellFF where v cc identifies the controller port to which the device or device enclosure is attached SAS RAID controllers for IBM i 55 ...

Страница 68: ...he device is connected off port 1A of the expander A value of FF indicates the expander port is not known v ll is the logical unit number LUN of the device A value of FF indicates the LUN is not known A resource can identify a physical device or it can identify other SAS components For example v FFFFFFFF indicates the identity of the device is not known or indicates a SAS RAID controller v ccFFFFF...

Страница 69: ...Figure 48 SAS unit addresses for CCIN 57CD PCIe SAS RAID and SSD Adapter 3 Gb x8 SAS RAID controllers for IBM i 57 ...

Страница 70: ...58 SAS RAID controllers for IBM i ...

Страница 71: ...d or changes in the product s and or the program s described in this publication at any time without notice Any references in this information to websites not owned by the manufacturer are provided for convenience only and do not in any manner serve as an endorsement of those websites The materials at those websites are not part of the materials for this product and use of those websites is at you...

Страница 72: ...ort websites for updated information and fixes applicable to the system and related software Homologation statement This product may not be certified in your country for connection by any means whatsoever to interfaces of public telecommunications networks Further certification may be required by law prior to making any such connection Contact an IBM representative or reseller for any questions Tr...

Страница 73: ...pareil numérique de la classe A est conforme à la norme NMB 003 du Canada European Community Compliance Statement This product is in conformity with the protection requirements of EU Council Directive 2004 108 EC on the approximation of the laws of the Member States relating to electromagnetic compatibility IBM cannot accept responsibility for any failure to satisfy the protection requirements res...

Страница 74: ... Harmonics Guideline with Modifications products greater than 20 A per phase Electromagnetic Interference EMI Statement People s Republic of China Declaration This is a Class A product In a domestic environment this product may cause radio interference in which case the user may need to perform practical action Electromagnetic Interference EMI Statement Taiwan The following is a summary of the EMI...

Страница 75: ...Erweiterungskomponenten von Fremdherstellern ohne Empfehlung von IBM gesteckt eingebaut werden EN 55022 Klasse A Geräte müssen mit folgendem Warnhinweis versehen werden Warnung Dieses ist eine Einrichtung der Klasse A Diese Einrichtung kann im Wohnbereich Funk Störungen verursachen in diesem Fall kann vom Betreiber verlangt werden angemessene Maßnahmen zu ergreifen und dafür aufzukommen Deutschlan...

Страница 76: ... protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interferen...

Страница 77: ...nts of EU Council Directive 2004 108 EC on the approximation of the laws of the Member States relating to electromagnetic compatibility IBM cannot accept responsibility for any failure to satisfy the protection requirements resulting from a non recommended modification of the product including the fitting of non IBM option cards This product has been tested and found to comply with the limits for ...

Страница 78: ...äte wie in den Handbüchern beschrieben zu installieren und zu betreiben Des Weiteren dürfen auch nur von der IBM empfohlene Kabel angeschlossen werden IBM übernimmt keine Verantwortung für die Einhaltung der Schutzanforderungen wenn das Produkt ohne Zustimmung von IBM verändert bzw wenn Erweiterungskomponenten von Fremdherstellern ohne Empfehlung von IBM gesteckt eingebaut werden Deutschland Einha...

Страница 79: ...ercial Use You may reproduce distribute and display these publications solely within your enterprise provided that all proprietary notices are preserved You may not make derivative works of these publications or reproduce distribute or display these publications or any portion thereof outside your enterprise without the express consent of IBM Rights Except as expressly granted in this permission n...

Страница 80: ...68 SAS RAID controllers for IBM i ...

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