Copy Speed, Read Source, 46Creating Storagesets | Compaq HSZ80

3–46Creating Storagesets

Copy Speed

Specify a copy speed to determine the speed with which the controller copies the data from an operational disk drive to a replacement disk drive:

■COPY=NORMAL (default) balances the overall performance of the subsystem against the need for reconstructing the replacement disk drive.

■COPY=FAST allocates more resources to reconstructing the replacement disk drive, which may reduce the subsystem’s overall performance during the reconstruction task.

Read Source

Specify the read source to determine how the controller reads data from the members of a mirrorset:

■READ_SOURCE=LEAST_BUSY (default) forces the controller to read data from the “normal” or operational member that has the least-busy work queue. If multiple disks have equally short queues, the controller queries normal local disks for each read request as it would when READ_SOURCE= ROUND_ROBIN is specified. If no normal local disk exists, then the controller will query any remote disks, if they are available.

■READ_SOURCE=ROUND_ROBIN forces the controller to read data sequentially from all “normal” or operational members in a mirrorset. For example, in a four-member mirrorset (A, B, C, and D), the controller reads from A, then B, then C, then D, then A, then B, and so forth. No preference is given to any member. If no normal local disk exists, then the controller will query any remote disks, if they are available.

■READ_SOURCE=DISKnnnn forces the controller to always read data from a particular “normal” or operational member. If the specified member fails, the controller reads from the least busy member.

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Compaq HSZ80 manual Copy Speed, Read Source, 46Creating Storagesets

Contents

HSZ80 Array Controller ACS Version Page Japan USA Page Chapter Creating Storagesets CLI Commands Vii Viii Appendix a Page Figures Xii Tables Xiii Xiv Getting Help Compaq Website Telephone Numbers Precautions Electrostatic Discharge PrecautionsComponent Precaution Xvi About This Guide Maintenance Port Precautions Vhdci Cable PrecautionsXvii Typographical Conventions ConventionsXviii About This Guide Special Notices Xix Required Tools Xx About This Guide Related Publications Xxi Revision History Xxii About This Guide General Description Typical Installation 2General Description Basic Building Block Basic Building Blocks List 4General Description Summary of HSZ80 Features Summary of Controller Features 6General Description HSZ80 Array Controller Bridging the Gap Between the Host and Its Storage Subsystem 8General Description HSZ80 Array Controller HSZ80 Array Controller Description of Parts 10General Description Description of Parts Parts of the Optional Maintenance Port Cable 12General Description Operator Control Panel EMU PVA Maintenance Port 14General Description Utilities and Exercisers Fault Management UtilityVirtual Terminal Display Configuration Utility Disk Inline ExerciserCode Load and Code Patch Utility Clone Utility Change Volume Serial Number Utility Field Replacement UtilityDevice Statistics Utility Cache Module Cache Module Memory Configurations18General Description Location of Cache Module Parts Caching Techniques Read CachingRead-Ahead Caching 20General Description Write-Through Caching Write-Back Caching Fault-Tolerance for Write-Back Caching Nonvolatile MemoryCache Policies Resulting from Cache Module Failures 22General Description Cache Policies and Cache Module Status 24General Description Failover to controller B Resulting Cache Policies and ECB Status 26General Description Through caching to its units Less than 28General Description External Cache Battery 10 ECB Capacity Based on Memory Size 11 Location of Parts 30General Description Charging Diagnostics Battery HysteresisPage Configuring an HSZ80 Array Controller 2Configuring an HSZ80 Array Controller Configuration RulesIntroduction Configuring an HSZ80 Array Controller Few Tips 4Configuring an HSZ80 Array Controller Configuring a Single Controller Location of Parts for a Single Controller Configuration 6Configuring an HSZ80 Array Controller SET Thiscontroller HOSTFUNCTION= ID, Mode 8Configuring an HSZ80 Array Controller Connecting a Single Controller to the Host 10Configuring an HSZ80 Array Controller Location of Parts for Transparent Failover 12Configuring an HSZ80 Array Controller SET Failover Copy = Thiscontroller Restart Othercontroller Restart Thiscontroller 14Configuring an HSZ80 Array Controller Connecting in Transparent Failover Mode to the Host 16Configuring an HSZ80 Array Controller Location of Parts for Multiple-Bus Failover 18Configuring an HSZ80 Array Controller SET Multibusfailover Copy = Thiscontroller Restart Othercontroller Restart Thiscontroller 20Configuring an HSZ80 Array Controller Connecting in Multiple-Bus Failover Mode to the Host Optional Steps 22Configuring an HSZ80 Array ControllerChange the CLI prompt Set the maximum data-transfer rate 24Configuring an HSZ80 Array Controller UPS Support Setting the PVA Module ID Switch 26Configuring an HSZ80 Array Controller Establishing a Local Connection to Controller PC/Terminal to Maintenance Port Connection 28Configuring an HSZ80 Array Controller This Controller and Other Controller Selecting a Failover Mode Using Transparent Failover Mode Using Multiple-Bus Failover Mode 30Configuring an HSZ80 Array Controller Selecting a Cache Mode Enabling Mirrored Write-Back Cache Fault-Tolerance 32Configuring an HSZ80 Array Controller Setting Scsi Target ID Numbers Host Scsi Bus 34Configuring an HSZ80 Array Controller Device Scsi Bus Using Preferred ID Numbers Page Creating Storagesets 2Creating Storagesets Disk drives Planning and Configuring Storagesets 4Creating Storagesets Creating a Storageset and Device Profile Creating Storagesets Type of Storageset Determining Storage Requirements Choosing a Storageset Type A Comparison of Different Kinds of Storagesets8Creating Storagesets For Disk Array Technology Using Stripesets to Increase I/O Performance Considerations for Planning a Stripeset 10Creating Storagesets Distribute Members across Ports Using Mirrorsets to Ensure Availability 12Creating Storagesets Considerations for Planning a Mirrorset Mirrorsets Maintain Two Copies of the Same Data 14Creating Storagesets First Mirrorset Members on Different Buses Using RAIDsets to Increase Performance Availability Considerations for Planning a RAIDset 16Creating StoragesetsPage 18Creating Storagesets Striping and Mirroring in the Same Storageset Considerations for Planning a Striped Mirrorset Cloning Data for Backup 20Creating Storagesets Clone Steps for Duplicating Unit Members Example 22Creating Storagesets Use available device DISK20400size=832317 for member 24Creating Storagesets DISK20000size=832317 y,n y ? y Backing Up Your Subsystem Configuration Saving Subsystem Configuration Information to a Single Disk Saving Subsystem Configuration Information to a Storageset 26Creating Storagesets Displaying the Status of the Save Configuration Feature Controller 28Creating Storagesets Cache Notransportable Restoring Node IDs Node IDs30Creating Storagesets Page Assigning Unit Numbers for Host Access to Storagesets 32Creating Storagesets Unit Numbering Examples LUN Creating a Storageset Map 34Creating Storagesets 10. Storageset Map 36Creating Storagesets Device PTL Addressing Convention within ControllerLocate devicename 11. PTL Naming Convention 38Creating Storagesets Device port numbers Target Numbers 13. Locating Devices using PTLs Defining a Partition Planning Partitions40Creating Storagesets Guidelines for Partitioning Storagesets Disk Drives Choosing Switches for Storagesets Devices Enabling SwitchesChanging Switches 42Creating Storagesets Replacement Policy RAIDset SwitchesReconstruction Policy Membership 44Creating Storagesets Mirrorset Switches Read Source Copy Speed46Creating Storagesets Disaster Tolerance Support Transportability Device Switches48Creating Storagesets Device Transfer Rate 50Creating Storagesets Local/RemoteDtsupport Initialize Switches Chunk Size Increasing the Request Rate 52Creating Storagesets Increasing the Data Transfer Rate 16. Chunk Size Smaller than the Request Size Increasing Sequential Write Performance Maximum Chunk Size for RAIDsetsMaximum Chunk Sizes for a RAIDset 54Creating Storagesets Save Configuration Considerations for Saving the Configuration 56Creating Storagesets Destroy/Nodestroy Unit Switches for Storagesets Unit Switches58Creating Storagesets Configuring Storagesets 2Configuring Storagesets ADD Disk DISKnnnn ptl-location switchvalueAdding Disk Drives Adding One Disk Drive at a Time Configuring a Stripeset Configuring a Mirrorset 4Configuring StoragesetsADD Mirrorset mirrorset-name DISKnnnn DISKnnnn switch Initialize mirrorset-name switch ADD Unit unit-number mirrorset-name switch Show mirrorset-name Configuring a RAIDset 6Configuring StoragesetsADD Raidset RAIDset-name DISKnnnn DISKnnnn DISKnnnn switch Initialize RAIDset-name switch Show RAIDset-name Configuring a Striped MirrorsetADD Stripeset stripeset-name mirrorset1 mirrorset2 8Configuring Storagesets Configuring a Single-Disk Unit ADD Unit unit-number DISKnnnn switchvalue 10Configuring Storagesets Partitioning a Storageset or Disk Drive Initialize storageset-name switch Show storageset-name 12Configuring Storagesets Adding a Disk Drive to the Spareset Removing a Disk Drive from the Spareset 14Configuring Storagesets Enabling Autospare 16Configuring Storagesets Deleting a StoragesetDelete unit-number Delete storageset-name Changing Switches for a Storageset or Device Displaying the Current SwitchesChanging RAIDset and Mirrorset Switches Changing Device Switches Changing Unit Switches Changing Initialize Switches18Configuring Storagesets Configuring with the Command Console LUN Enabling and Disabling the CCL SCSI-2 Mode SCSI-3 Mode20Configuring Storagesets Finding the CCL Location Troubleshooting with the CCL Adding Storage Units with the CCL 22Configuring Storagesets Configuring Units with Multiple Hosts Host Modes 24Configuring Storagesets IBM AIX Setting Host Modes 26Configuring Storagesets Transparent Failover ModeDesignating the Port Accessing Units on a Given Port 28Configuring Storagesets Designating the Host Scsi ID Number Scsi ID 30Configuring Storagesets Designating the Port and Designating the Host Scsi ID Number SET this PORT1ID = SET this PORT2ID = Multiple-Bus Failover Mode 32Configuring Storagesets Assigning Units through Multiple Host Adapters 34Configuring Storagesets Moving Storagesets Moving a Storageset from one Subsystem to Another 36Configuring Storagesets Locate disk-nameDelete disk-name ADD Disk disk-name PTL-location ADD storageset-name disk-name disk-name ADD Unit unit-number storageset-name 38Configuring Storagesets Move disk drives to their new location CLI Commands Using the CLI Command Overview2CLI Commands CLI Overview Getting Help Entering CLI CommandsSET Thiscontroller ? 4CLI Commands Recall and Edit Command KeysUnit Naming Unit Number Command Syntax 6CLI CommandsCommand parameter Switches Changing the CLI Prompt Syntax ADD DiskParameters Switches 8CLI CommandsTransportable Remote TRANSFERRATEREQUESTED=20MHZ Default TRANSFERRATEREQUESTED=ASYNCHRONOUSTRANSFERRATEREQUESTED=10MHZ TRANSFERRATEREQUESTED=5MHZ ADD Disk DISK40200 4 2 0 Transportable 10CLI Commands See alsoInitialize DISK20000 2 0 ADD Unit D199 DISK20000 ADD Disk DISK200 2 0 0 Remote ADD Mirrorset COPY=FAST 12CLI Commands POLICY=BESTPERFORMANCE DefaultDtsupport Nodtsupport POLICY=BESTFIT READSOURCE=disk-name READSOURCE=LEASTBUSY Default READSOURCE=ROUNDROBIN ADD Mirrorset MIRR1 DISK10000 DISK20100 DISK30200 14CLI CommandsInitialize MIRR1 ADD Unit D104 MIRR1 Initialize Mirror Reduce ADD Disk ADD UnitShow Mirrorsets Show Storagesets Unmirror 16CLI Commands ADD PassthroughParameter ADD Passthrough passthrough-name scsi-port-target-lun ADD Passthrough TAPE20300 2 3 ADD Unit P100 TAPE20300 Show Devices Show Passthrough 18CLI CommandsShow passthrough-name ADD Raidset RAIDset-name RECONSTRUCT=NORMAL Default 20CLI CommandsRECONSTRUCT=FAST Noreduced Default ReducedADD Raidset RAID9 DISK10000 DISK20100 DISK30200 Initialize RAID8 22CLI Commands ADD Unit D70 RAID8ADD Raidset RAID6 DISK10300 DISK20400 DISK30200 Reduced SET Raidset Show Raidset ADD Spareset ADD Spareset DISK20200 ADD Spareset DISK30300Delete Spareset Show Spareset Show Storagesets Disk-name 24CLI Commands ADD StripesetStripeset-name Container-name1 container-name2 container-nameN ADD Stripeset STRIPE1 DISK10000 DISK20100 DISK30200 Initialize STRIPE1 ADD Unit D103 STRIPE1 ADD Unit ADD Mirrorset 26CLI CommandsInitialize Show Storageset Show Stripeset ADD Unit unit-number container-name ADD UnitUnit-number ADD Unit Switches for Storagesets 28CLI CommandsPage 30CLI Commands MAXIMUMCACHEDTRANSFER=32 Default MAXIMUMCACHEDTRANSFER=nNopreferredpath Default PARTITION=partitionnumber Readcache Default Readaheadcache DefaultNoreadcache Noreadaheadcache 32CLI Commands NorunNowriteprotect Nowritebackcache ADD Unit D102 DISK10000 PREFERREDPATH=THISCONTROLLER 34CLI Commands CreatepartitionDelete unit-number SET unit-number Show Units Clearerrors CLI Clearerrors CLIClearerrors CLI Clearerrors Clearerrors Clearerrors Clearerrors 36CLI Commands Clearerrors controller InvalidcacheController Examples Clearerrors device-nameUNKNOWN 38CLI CommandsClearerrors DISK30000 Unknown Device-name See also 40CLI Commands Clearerrors unit-numberLOSTDATAClearerrors D103 Lostdata See also Clearerrors unit-number 42CLI CommandsClearerrors D103 Unwriteabledata Unwriteabledata See also Configuration Reset 44CLI CommandsConfiguration Reset Configuration Restore Configuration Save Initialize Configuration Restore Configuration Restore 46CLI Commands Configuration Reset Configuration Save Initialize Configuration Save Configuration Reset Configuration Restore Initialize 48CLI Commands CreatepartitionCreatepartition container-name SIZE=percent SIZE=percent CAPACITY= CYLINDERS= HEADS= SECTORSPERTRACK= 50CLI Commands Destroy Partition Show Delete DISK10000 Delete STRIPE1 Delete Failedset Delete Spareset Unmirror 52CLI CommandsDelete RAID9 Delete Failedset DISK20200 Delete FailedsetSET Failedset Show Failedset Delete Spareset 54CLI CommandsDelete Spareset DISK20300 ADD Spareset Show Spareset Delete unit-number Delete D103 ADD Unit Clearerrors Lostdata 56CLI CommandsDelete Failedsets Delete Sparesets Destroypartition Destroypartition container-name PARTITION=partition-number DestroypartitionPartition-number 58CLI Commands Delete D102 Destroypartition RAID9 PARTITION=2 Directory DirectoryRUN 60CLI Commands HelpHelp Help SET ? Your options are Initialize 62CLI CommandsInitialize container-name CHUNKSIZE=DEFAULT Default CHUNKSIZE=n 64CLI Commands Destroy DefaultSaveconfiguration Nosaveconfiguration Default Initialize DISK10000 Saveconfiguration Show Devices Full 66CLI Commands Reduce DISK40400 Initialize DISK40400 Nodestroy Cancel LocateLocate parameter ALL 68CLI Commands DisksPTL SCSI-location Units Locate D102 Locate DISK10000 Locate CancelLocate Disks Mirror 70CLI CommandsMirror disk-name mirrorset-name Nopolicy Default POLICY=BESTFIT POLICY=BESTPERFORMANCE 72CLI Commands ADD Mirrorset Reduce Show Mirrorsets Unmirror Poweroff 74CLI CommandsBattery on Overridebadflush Poweroff Switch Settings SECONDS=nn 76CLI Commands Poweroff SECONDS=10 Reduce Reduce disk-name1 disk-name2 disk-name3 78CLI CommandsDisk-name1 disk-name2 disk-name3 Show STRIPE1 Show Mirrorsets ADD Mirrorset RUN Clone Show Mirrorset 80CLI CommandsSET mirrorset-name Rename Rename old-container-name new-container-nameOld-container-name New-container-name 82CLI Commands Rename DISK10000 Mydisk Show Disks Noignoreerrors Default IgnoreerrorsRestart controller 84CLI Commands ImmediateshutdownRestart Thiscontroller Restart Othercontroller Retryerrors unit-number Retryerrors D103 Unwriteabledata 86CLI Commands RUNRUN program-name Program-namePage 88CLI Commands RUN Dilx Selftest controller Selftest controller 90CLI Commands Selftest Othercontroller IgnoreerrorsSelftest Thiscontroller Restart controller Shutdown controller SET controller SET controller SwitchesThiscontroller 92CLI Commands CACHEFLUSHTIMER=n CACHEFLUSHTIMER=10 Default Nocacheups DefaultAllocationclass Cacheups 94CLI Commands CommandconsolelunNocommandconsolelun Default HOSTFUNCTION=mode HOSTFUNCTION=ID,mode NODEID=nnnn-nnnn-nnnn-nnnn checksum 96CLI Commands NOPORT1IDNOPORT2ID MirroredcachePage NOPORT1PREFERREDID 98CLI CommandsNOPORT2PREFERREDID SCSIVERSION=SCSI-2 Default TERMINALSPEED=baudrate TERMINALSPEED=9600 DefaultSCSIVERSION=SCSI-3 TERMINALPARITY=ODD TERMINALPARITY=EVEN 100CLI Commands Maximum SCSI-Bus Lengths for Given Data Transfer Rate 101 SET Othercontroller PROMPT=CONTROLLER BSET Thiscontroller PORT1ID=2,5 Show Thiscontroller Show Othercontroller 102CLI Commands SET device-name 103 104CLI Commands SET DISK20000 TRANSFERRATEREQUESTED=5MHZSET DISK10300 Transportable SET DISK10300 Remote 105 SET EMUSET EMU EMU Set Point Temperatures 106CLI CommandsFANSPEED=AUTOMATIC Default FANSPEED=HIGH SET EMU SENSOR2SETPOINT=34 107SET EMU FANSPEED=HIGH 108CLI Commands SET FailedsetSET Failedset Autospare Noautospare 109 SET DISK10000 TransportableInit DISK10000 SET Failedset Autospare SET Failover 110CLI CommandsThiscontroller Othercontroller SET Failover COPY=THISCONTROLLER 111SET Multibusfailover SET Nofailover SET Nomultibusfailover 112CLI Commands SET mirrorset-name 113 MEMBERSHIP=number-of-members REMOVE=disk-name 114CLI CommandsREPLACE=disk-name 115 116CLI Commands SET MIRR1 POLICY=BESTFIT 117 SET MIRR1 REMOVE=DISK30000SET MIRR1 REPLACE=DISK30200 ADD Mirrorset Reduce Show Mirrorset Unmirror 118CLI Commands SET Multibusfailover 119 SET Failover SET Nofailover SET Nomultibusfailover 120CLI Commands Nodestroyunflushabledata DefaultSET Nofailover Destroyunflushabledata SET Nofailover 121SET Failover SET Multibusfailover SET Nomultibusfailover 122CLI Commands SET Nomultibusfailover SET Nomultibusfailover Destroyunflushabledata 123SET Failover SET Multibusfailover SET Nofailover 124CLI Commands SET RAIDset-name 125 SET RAID9 POLICY=BESTFIT 126CLI CommandsSET RAID9 REMOVE=DISK10000 SET RAID9 REPLACE=DISK20100 127ADD Raidset Show Raidsets 128CLI Commands SET unit-number 129 130CLI Commands MAXIMUMCACHEDTRANSFER=n MAXIMUMCACHEDTRANSFER=32 Default 131 132CLI Commands ERRORMODE=NORMAL ERRORMODE=FAILSAFE 133 134CLI Commands 135 SET D102 Writeprotect Noreadcache 136CLI Commands ShowShow controller Show device-name Show device-type Show EMU 137 Device-typeEMU Storageset-name 138CLI Commands Full 139 Show MIRR1 140CLI CommandsShow Mirrorset Full 141 Show Thiscontroller Full 142CLI Commands Show EMU Shutdown controller 143 Shutdown Thiscontroller 144CLI CommandsRestart controller Selftest controller 145 UnmirrorUnmirror DISK10300 146CLI Commands ADD Mirrorset Reduce RUN Clone System Profiles Device Profile 2System Profiles Storageset Profile Reduced Membership Enclosure Template 4System Profiles Controller Specifications Physical and Electrical Specifications for Controller 2Controller Specifications Environmental Specifications Optimum Operating Environmental Specifications Table B-4 Maximum Nonoperating Environmental Specifications Table B-3 Maximum Operating Environmental Specifications4Controller Specifications Glossary GL-2Glossary Bit CSR GL-4Glossary Data striping Dual-simplex See ECB GL-6Glossary FD Scsi IBR GL-8Glossary Operation Mist GL-10Glossary Normal member PCM GL-12Glossary PTL RAIDset GL-14Glossary RFI SCSI-P cable GL-16Glossary Storage subsystem GL-17 Synchronous GL-18Glossary Vhdci GL-19 Page ADD Passthrough passthrough-name scsi-port-target-lun,5-16 ADD Raidset RAIDset-name container- nameNADD Stripeset stripeset-name container- nameN ADD Unit unit-number container-name,5-27Adding 2Index Batteryoff Poweroff Batteryon PoweroffAUTOSPARE, 4-15SET Failedset Cacheups Capacity CREATEPARTITION, 5-49INITIALIZEChunksize Initialize Lostdata 4Index SET MULTIBUSFAILOVER, 5-118SET NofailoverPage Copy 6IndexCylinders CREATEPARTITION, 5-49INITIALIZE Destroyunflushabledata SET Nofailover SET Nomultibusfailover Disableaccesspath ADD Unit 8IndexDilx Disks Errormode Enableaccesspath ADD UnitECB Index Saveconfiguration NosaveconfigurationADD Disk PTL SCSI-location,5-68unit-number,5-68UNITS Maximumcachedtransfer ADD UnitMembership SET mirrorset-name,5-113Membership Nooverridebadflush Poweroff Noautospare SET Failedset NodeidINVALIDCACHE, 5-36NODTSUPPORT Nopolicy ADD RAIDSET, 5-20NOPORT1ID Overridebadflush Poweroff NOPORT2TRANSFERRATEREQUEST EDNopreferredpath Noreadcache PORT1ID Show device-type,5-137PathPORT2ID Prompt PreferredpathSET controller, 5-98Protocol SET mirrorset-name,5-114 SET RAIDset-name,5-125Rename old-container-name new-container SET mirrorset-name,5-116 RUN program name PORT2PREFERREDID PORT2TRANSFERRATEREQUESTE D PORT1PREFERREDID PORT1TRANSFERRATEREQUESTE DWRITEPROTECT, 5-133WRITEBACKCACHE Passthrough Show storageset-name,5-137SHOW storageset-type,5-137 Size Createpartition TRANSFERRATEREQUESTED, 3-49TRANSPORTABLE SET controller, 5-99Tip, defined, xix Tools, xx Topology TimeTRANSFERRATEREQUESTED, 3-49ADD Disk Vtdpy Writeprotect