Ras | IBM DS6000 Series guide

3

Chapter 3. RAS

This chapter describes the RAS (reliability, availability and serviceability) characteristics of the DS6000 series. Specific topics covered are:

Controller RAS

Host connection availability

Disk subsystem RAS

Power subsystem RAS

Light path guidance strategy

Microcode updates

© Copyright IBM Corp. 2004. All rights reserved.

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IBM DS6000 Series manual Ras

Contents

Architecture Page IBM TotalStorage DS6000 Series Concepts and Architecture First Edition March Iii Iv DS6000 Series Concepts and Architecture Contents IBM TotalStorage DS6000 model overview Part 3. Planning and configuration DS CLI Introduction Functionality Page Page Page Index Copyright License Trademarks Changed information see change bars March 2005, First Edition Xvi DS6000 Series Concepts and Architecture Xvii Team that wrote this redbook Xviii DS6000 Series Concepts and Architecture Preface Xx DS6000 Series Concepts and Architecture Comments welcome Become a published author Xxii DS6000 Series Concepts and Architecture Part 1 Introduction DS6000 Series Concepts and Architecture Introducing the IBM TotalStorage DS6000 series Infrastructure simplification DS6000 series, a member of the TotalStorage DS FamilyBusiness continuity Information lifecycle management Scaling options of the DS6000 and DS8000 series IBM TotalStorage DS6000 series unique benefits Hardware overview DS6800 controller enclosure ModelProcessors Disk drives Switched FC-AL subsystemDense packaging Host adapters DS management console Storage capacityDS6000 expansion enclosure Model 1750-EX1 IBM TotalStorage DS Storage Manager Simulated offline configuration IBM TotalStorage DS Command-Line InterfaceReal-time online configuration Supported environment Business continuance functions Point-in-time Copy featureData Set FlashCopy Multiple Relationship FlashCopy Remote Mirror and Copy feature Global Copy Three sites solutionGlobal Mirror Remote Mirror connections Service and setup ResiliencyInteroperability Dynamic LUN/volume creation and deletion Configuration flexibilityLarge LUN and large CKD volume support Flexible LUN to LSS association Positioning the IBM TotalStorage DS6000 series Simplified LUN maskingSummary Common set of functions Common management functionsDS6000 series compared to ESS DS6000 series compared to DS4000 series DS6000 series compared to DS8000 series Performance Tagged Command QueuingUse with other virtualization products Self-learning cache algorithms Sarc IBM multipathing software Parallel Access Volumes PAVPerformance for zSeries Multiple Allegiance 20 DS6000 Series Concepts and Architecture Part 2 Architecture 22 DS6000 Series Concepts and Architecture Components Lower RAID controller Battery backup units Upper RAID controller Rear display panel Power supplyServer enclosure Front display panel Disk drive modules Expansion enclosure Upper Sbod controller Rear display panel Power supplyController architecture Lower Sbod controller SAN fabric Cache management Server-based design Randomseq Disk subsystem Non-switched FC-AL drawbacks Industry standard FC-AL disk enclosure Switched FC-AL advantages Disk enclosure DS6000 switched FC-AL implementation DDMs 10 Switched disk expansion Server enclosure RAID controller card Technical detailsDevice adapter ports Host adapter port indicators Device adapter port indicatorsHost adapter ports SFPs Health indicators Expansion enclosure Sbod controller cardEthernet and serial ports Cabling Indicators 15 Expansion enclosure cabling Disk Contrl ports on loop Front panel Rear panel DS6000 front panel indicators Enclosure ID indicator Rack identify connectorDS6000 rear panel push buttons 18 DS6000 power supplies Power subsystem DS6800 battery backup unit indicators Battery backup units System service card Storage Manager consoleCables Summary 44 DS6000 Series Concepts and Architecture RAS Controller RAS Failover and failbackData flow DS6800 normal data flow Failover Failback NVS recovery after complete power loss Host connection availability Metadata checksSingle and preferred path Controller SAN/FICON switches Open systems host connection ZSeries host connectionMultipathing software RAID-5 overview Disk subsystem RASRAID-5 theory RAID-5 implementation in the DS6000 Drive failure RAID-10 overviewRAID-10 theory RAID-10 implementation in the DS6000 Floating spares Spare creation Disk scrubbing Predictive Failure Analysis PFADisk path redundancy Hot plugable DDMs DS6000 switched disk connections Power subsystem RAS Example 1 Using light path indicators to replace a DDM System serviceExample 2 Using the GUI to replace a power supply Redundant cooling Failed power supply Power supply replacement via the GUI System Identify Indicator blue light System indicatorsSystem Alert Indicator amber light System Information Indicator amber light Parts replacement Parts installation and repairsCRU parts versus FRU parts Tier 1 CRU parts Microcode updates Installation processMaintaining code Summary 64 DS6000 Series Concepts and Architecture Virtualization concepts Abstraction layers for disk virtualization Virtualization definition Physical layer as the base for virtualization Array sites Array sites Arrays Creation of an array Ranks Forming an FB rank with 1 GB extents Extent pools Server0 Logical volumes CKD volumesFixed block LUNs Volume with ISeries LUNs Allocation and deletion of LUNs/CKD volumes Logical subsystems LSS DB2 Address groups Volume access Host attachment Volume group Summary of the virtualization hierarchy 10 Host attachments and volume groups 11 Virtualization hierarchy Placement of data 12 Optimal distribution of data Benefits of virtualization 82 DS6000 Series Concepts and Architecture IBM TotalStorage DS6000 model overview 1 DS6800 Model DS6000 highlights DS6800 Model 1750-511 rear view 2 DS6000 Model 1750-EX1 DS6800 Model 1750-EX1 rear view Designed to scale for capacity DS6800 physical capacity examples DS6800 capacity upgrade O L Copy Services Introduction to Copy Services Copy Services functionsPoint-in-Time Copy FlashCopy Read from the target volume Read from the source volumeWrite to the source volume Write to the target volume Refresh target volume also known as Incremental FlashCopy Point-in-Time Copy function authorizationFlashCopy options No background copy option Incremental FlashCopy Data Set FlashCopy Data Set FlashCopy Multiple Relationship FlashCopy Consistency Group FlashCopy What is Consistency Group FlashCopy? FlashCopy Source Volume FlashCopy Target Volume FlashCopy to Pprc Primary Volume Remote Mirror and Copy Peer-to-Peer Remote Copy Inband commands over remote mirror linkPersistent FlashCopy Metro Mirror Synchronous Pprc Metro Mirror Global Copy PPRC-XD Global Copy Global Mirror Asynchronous Pprc Global Mirror How Global Mirror works Global Mirror How it works OS Global Mirror XRC Ashynchronously Comparison of the Remote Mirror and Copy functions 104 DS6000 Series Concepts and Architecture What is data consistency? What is Consistency Group? 12 Consistency Group Example How does Consistency Group keep data consistency? LSS13 14 Consistency Group Example Interfaces for Copy Services DS Storage Manager Web-based interface DS Command-Line Interface CLI DS open application programming interface API Tip What is changed from the ESS CLI? Future Plan Interoperability with ESS 112 DS6000 Series Concepts and Architecture 113 Part 3 Planning and configuration 114 DS6000 Series Concepts and Architecture 115 Installation planning Installation site preparation General considerationsFloor and space requirements Service clearance requirements Floor load requirements117 Environmental requirements Power requirementsInput voltage requirements DS6000 series input voltage requirements Preparing the rack System management interfacesIBM TotalStorage DS Storage Manager 119 DS Open application programming interface DS Command-Line Interface 121 Network settings SAN environment SAN requirements and considerations Attaching to an Open System host FICON-attached zSeries Host123 Software requirements Licensed features 125 Configuration planning DS6000 Management Console Configuration planning considerations Configuration management of DS6000 system Offline configuration127 Express configuration Online configuration Local maintenance DS Management Console connectivity129 Remote service support Copy Services management Call home DS6000 licensed functionsSimple Network Management Protocol Snmp 131 Operating Environment License OEL required feature Operating environment license feature codesLicense scope for each DS6000 licensed function Point-in-Time Copy function PTC Optional featuresRemote Mirror and Copy functions RMC 133 Parallel Access Volume PAV feature codes Parallel Access Volumes PAVServer attachment license Ordering license functions User authorized to FlashCopy 25 TB of CKD data 135 Solution 137 Disk storage feature activation Capacity planning Physical configurations 139 Logical configurations CKD RAID rank capacity Configuration with the same type of DDMs Sparing rules141 Sparing Example 1 RAID 143 Configuration with different types of DDMs Sparing Example 3 RAID 145 Data migration planning Operating system mirroring Basic commandsSoftware packages Remote copy technologies Migration appliances 6 z/OS data migration methods147 Disk Magic Planning for performance Number of host ports Parallel Access Volumes z/OS onlyRemote copy 5 I/O priority queuing z/OS only Preferred paths Hot spot avoidance 151 DS Storage Manager Logical configuration Storage configuration terminology Configuration hierarchy, terminology, and conceptsStorage complex Storage unit PSeries2 Arrays Array sitesRanks Extent pools Extent Pool Volume groups Logical volumes Volume Group Address groups Example of Volume Group, LUNs and host attachment definition Extent Pool Copy services Relationships Raw DDMs PlanningArray Site Array layer Logical Configuration flow Logical volume layerRaw or physical DDM layer Array site layer Connecting to your DS6000 Introducing the GUI and logical configuration panels Introduction and Welcome panel 10 Entering the URL using the TCP/IP address for the SMC 12 View of the Welcome panel Real-time manager configuration Simulated manager configuration Copy Services Log Express configuration Create and define the users and passwords Using the help panels Software information center 17 View of the information center Navigating the GUI 19 View of the storage complexes in the work area 20 View of the Storage Complexes section Radio buttons and check boxes Configuring a storage complex Logical configuration process Configuring the storage unit 25 View of the General storage unit information panel Configuration advancements steps 28 Specify the I/O adapter configuration panel Configuring the logical host systems 30 View of Host Systems panel, with the Go button selected 32 View of Define Host Systems panel 34 View of the Select storage unit panel Click Apply assignment and OK Creating arrays from array sites 37View of the Array configuration Auto panel 38 View of the Add arrays to ranks panel, with FB selected 39 View of creating custom arrays from four disk array sites 40 View of the second array-site selection panel Creating extent pools 42 View of Define properties panel Creating FB volumes from extents Even numbered LSSs Radio button Click Volume Groups Creating volume groups 46 The Define volume group properties filled out Deleting LUNs and recovering space in the extent pool Assigning LUNs to the hostsClick Host Systems Creating CKD volumes Click Volumes → zSeriesCreating CKD LCUs Click Express Configuration Wizard Using the Express Configuration Wizard 50 View of the Real-time Manager panel Click Storage units Wwnn number is displayed as shown in Figure 194 DS6000 Series Concepts and Architecture 195 Functionality Introduction Supported environments Installation methods ESS Copy Services command flow using ESS Copy Services CLI Command flow DS CLI command flow Secure socketsTCP/IP ports DS8000 split network DS6000 command flow ESS CLI co-existence Command flow for the DS6000 CLI co-existence Storage management Single command mode Command modesExample 10-1 Using DS CLI via a single command User security Script mode Interactive modeExample 10-4 Using DS CLI in interactive mode Example 10-3 Creating a DS CLI script Lists all available DS CLI commands Syntax conventionsUser assistance Return codes Example 10-8 Use of the help -lcommandMan pages DS CLI return codes Example 10-11 Example of a configuration script Usage examplesExample 10-10 Return code examples Mixed device environments and migration Which CLI to use based on what hardware you have installed Migration tasks DS CLI migration exampleDetermining the saved tasks to be migrated Migration considerations Collecting the task details A portion of the tasks listed by using the GUI Using the GUI to get the contents of a FlashCopy task Converting the saved task to a DS CLI command Converting a FlashCopy task to DS CLI Example 10-14 Using interactive dscli mode without profiles Using DS CLI commands via a single command or script Procedure to create an encrypted password fileCreating a user ID for use only with ESS Example 10-15 Example of a dscli.profile file Setting up a profile Issuing a DS CLI command and scripting it Example 10-20 Using script modeExample 10-19 Creating an executable file 216 DS6000 Series Concepts and Architecture 217 218 DS6000 Series Concepts and Architecture 219 Performance considerations What is the challenge? Speed gap between server and disk storageNew and enhanced functions 221 Where do we start? SSA backend interconnection Switch from Escon to Ficon portsArrays across loops Pprc over Fibre Channel links How does the DS6000 address the challenge? Fibre Channel switched disk interconnection at the back endFC-AL shortcomings How DS6000 series overcomes FC-AL shortcomings Fibre Channel switch 225 New four-port host adapters Fibre Channel device adapter 227 Enterprise-class dual cluster design for the DS6800 Power PC 229 Vertical growth and scalability Performance and sizing considerations for open systems Workload characteristics Data placement in the DS6000 LVM striping231 10 Spreading data across ranks Stripe size Performance and sizing considerations for z/OS Determining where to attach the hostDetermining the number of paths to a LUN Subsystem Device Driver SDD Dynamic I/O load balancing Performance potential in z/OS environments Connect to zSeries hosts An appropriate DS6000 size in z/OS environments Processor memory size considerations for z/OS environments235 Disk array sizing considerations for z/OS environments Or zSeries channel consolidation Configuration recommendations for z/OS Configure one extent pool for each single rank237 Rank Minimize the number of extent pools Plan for a reasonable number of extent pools239 14 Mix of extent pools 241 242 DS6000 Series Concepts and Architecture 243 ZSeries software enhancements Software enhancements for the DS6000 12.2 z/OS enhancementsScalability support Read availability mask support Large Volume Support LVSBenefits of the scalability enhancements 245 Initial Program Load IPL enhancements 12.2.5 DS6000 definition to host softwareRead Control Unit and Device Recognition for DS6000 New performance statistics Resource Measurement Facility RMF247 Preferred pathing Devserv Paths command showing preferred pathing 12.4 z/VSE enhancements 12.3 z/VM enhancementsMigration considerations Coexistence considerations TPF enhancements 251 Data Migration in zSeries environments Consolidate logical volumes Define migration objectives in z/OS environmentsConsolidate storage subsystems Keep source and target volume at the current size Summary of data migration objectives253 Physical migration with DFSMSdss and other storage software Data migration based on physical migration Software- and hardware-based data migration Data migration with Piper for z/OS255 Piper hardware 257 Data migration with z/OS Global Mirror Bridge from Escon to Ficon with Metro/Global Copy Hardware- and microcode-based migration 259 Data migration with Metro Mirror or Global Copy 260 DS6000 Series Concepts and Architecture Pprcopy DDNAMEDD02 Query 261 If PENDING/SUSPEND Count of Tracks Remaining to be Copied = Example 13-2 All data is replicated Data migration based on logical migration 263Example 13-4 All data is replicated FDR Data Set Services Utility DFSMSdss SMS Storage Groups migration source environment Data migration within the system-managed storage environment Example 13-6 Select SMS storage group in Scds SG1 SG2 267 Volume Display, Define Alter or Delete Volume Information ALL Volumes Altered Example 13-10 Confirmation about SMS volume status change 269 Storgrp SG1 Combine physical and logical data migration 271 13.5 z/VM and VSE/ESA data migration Summary of data migration 273 274 DS6000 Series Concepts and Architecture 275 Open systems support and software Supported operating systems and servers Open systems support Where to look for updated and detailed information Platform and operating system vendors’ pages Differences to ESSQLogic Corporation Emulex Corporation Boot support Additional supported configurations RPQDifferences in interoperability between DS6000 and DS8000 Subsystem Device Driver DS CLI Other multipathing solutions IBM TotalStorage Productivity Center IBM TotalStorage Productivity Center MDM main panel Device Manager Sample Device Manager view TCP for Disk Example screenshot of TPC for Disk TPC for Replication Global Mirror Utility Enterprise Remote Copy Management Facility eRCMF 289 Data migration in the open Systems environment Few larger volumes Comparison of migration methods Host operating system-based migration291 Copy raw devices Basic copy commands Migration using volume management software Online copy and synchronization with rsync293 Migration using LVM mirroring Backup and Restore 295 Subsystem-based data migration Combination of Metro Mirror and Global Copy Metro Mirror and Global Copy 297 IBM Piper migration Other migration applications IBM migration services 299 Appendix A. Operating systems specifics DS6000 Host Systems Attachment Guide Data placement considerationsPlanning Capacity planning considerations Iostat Unix performance monitoring tools301 Example A-1 AIX iostat output Example A-2 SUN Solaris iostat output System Activity Report SAR Example A-3 SAR Sample Output 303 AIX host attachment scripts Other publicationsFinding the World Wide Port Names Example A-4 Finding Fibre Channel adapter WWN Useful SDD commands Determine the installed SDD levelManaging multiple paths Subsystem device driver SDD Multipath I/O Mpio Example A-7 lsvpcfg command Useful Mpio commands Determine the installed Sddpcm levelExample A-8 lspath command result 307 AIX access methods for I/O LVM configurationLVM striping LVM Mirroring AIX on IBM iSeries Boot device supportDirect I/O Concurrent I/O Iostat Monitoring I/O performanceFilemon Example A-9 Filemon output file 311 Linux Implementing Linux with IBM Disk Storage Existing reference materialLinux with zSeries and ESS Essentials Getting Started with zSeries Fibre Channel Protocol Important Linux issues Some Linux Scsi basicsTable A-1 Major numbers and special device files Missing device files 315Example A-10 Create new special device files for Scsi disks Managing multiple paths Limited number of Scsi devicesScsi device assignment changes Fibre Channel disks discovered before internal Scsi disks RedHat Enterprise Linux RH-EL multiple LUN support317 Example A-12 Sample /etc/modules.conf Example A-13 SCSi disks attached at system start time Adding FC disks dynamically Linux on IBM iSeries Gaps in the LUN sequence319 /proc pseudo file system Troubleshooting and monitoringExample A-16 Sample /proc/scsi/scsi file Example A-17 Sample /proc/scsi/qla2300/x Performance monitoring with iostat Microsoft Windows 2000/2003Generic Scsi tools 321 SDD for Windows HBA and operating system settings 323 Windows Server 2003 VDS support Volume Shadow Copy Service FC port configurationHP OpenVMS Geographically Dispersed Sites 325 Volume configuration OpenVMS volume shadowing Command Console LUN 327 328 DS6000 Series Concepts and Architecture 329 Appendix B. Using the DS6000 with iSeries Table B-1 OS/400 logical volume sizes Logical volume sizesSupported environment Hardware Changing LUN protection Protected versus unprotected volumes Using 5250 interface Adding volumes to iSeries configuration Figure B-2 Work with Disk Units menu Figure B-4 Specify ASPs to Add Units to Adding volumes to an Independent Auxiliary Storage Pool Figure B-6 iSeries Navigator initial panel Figure B-8 iSeries Navigator Disk Units Figure B-10 Create a new disk pool Figure B-12 Defining a new disk pool Figure B-14 Add disks to Disk Pool Figure B-16 Confirm disks to be added to Disk Pool Figure B-18 New Disk Pool Status Multipath Figure B-21 New logical volume shown on iSeries Navigator Figure B-22 Single points of failure Avoiding single points of failure Figure B-23 Multipath removes single points of failure Configuring multipath Figure B-24 Example of multipath with iSeries Adding multipath volumes to iSeries using 5250 interface Figure B-25 Adding multipath volumes to an ASP Adding volumes to iSeries using iSeries Navigator Figure B-27 Adding a multipath volume Figure B-28 New Disk Pool shown on iSeries Navigator Figure B-30 Example of multipath logical units Managing multipath volumes using iSeries Navigator 350 DS6000 Series Concepts and Architecture Figure B-32 Multipath logical unit properties Figure B-33 Multipath connections Multipath rules for multiple iSeries systems or partitions Sizing guidelines Changing from single path to multipathPreferred path for DS6000 Cache Planning for arrays and DDMs Size and number of LUNs Number of iSeries Fibre Channel adaptersRecommended number of ranks Table B-2 Capacity per I/O Adapter Connecting via SAN switches Sharing ranks between iSeries and other serversTable B-3 Disk operations per second per RAID rank Migration OS/400 mirroringMetro Mirror and Global Copy OS/400 data migration Figure B-36 Ending allocation for existing disk units Copy Services for iSeries FlashCopyRemote Mirror and Copy AIX on IBM iSeries ISeries toolkit for Copy Services Linux on IBM iSeries 363 Appendix C. Service and support offerings IBM service offerings IBM Web sites for service offeringsIBM Implementation Services for TotalStorage disk systems IBM Implementation Services for TotalStorage Copy Functions Enterprise Remote Copy Management Facility eRCMF IBM Geographically Dispersed Parallel Sysplex Gdps IBM eServer iSeries Copy Services IBM Operational Support Services Support Line Appendix C. Service and support offerings 368 DS6000 Series Concepts and Architecture IBM Redbooks Other publications369 Online resources Help from IBM How to get IBM Redbooks 372 DS6000 Series Concepts and Architecture 373 Index DS CLI ESS Interoperability with ESS Page Unix DS6000 Series Concepts and Architecture Page Page IBM TotalStorage DS6000 Series Concepts Architecture