Hitachi 9960, 9900 Series manual Host Failover

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3.Host Failover

Hitachi High Availability Software Improves Application Service Levels

There are four basic types of high-availability middleware that can reduce downtime in the event of a data path or host failure. The Lightning 9900™ supports each classification of middleware:

1.Alternate Pathing middleware switches the I/O load in the event of path failure

This type of middleware automatically switches the I/O load on a failed primary path to an alternate path on the same host system. The Lightning 9900 support alternate pathing for AIX® 4.2 and above, Compaq True64™ UNIX®, HP® 10.01 and through PVlink, Windows NT/2000® and Sun Solaris™ 2.5 and Sequent DYNIX/ptx®. In addition, VERITAS® Dynamic Path Management™ (DPM) is supported.

2 . Hitachi Dynamic Link Manager™ provides path failover and load balancing

Hitachi Dynamic Link Manager™ is a family of Hitachi-provided middleware software utilities that are server-based as shown in Figure 22. Hitachi Dynamic Link Manager™ enhances the availability of RAID systems by providing automatic error recovery and path failover from server-to-RAID connection failures. Hitachi Dynamic Link Manager™ provides load balancing in addition to path failover by re-directing I/O activity to the least busy path using complex algorithms.

Just because a system is RAID-protected doesn’t mean it is protected against connection bus failures, which is why Hitachi Data Link Manager™ is required for true non-stop operations. This product allows systems administrators to take advantage of the multiple paths on a Lightning 9900™ by adding redundant connections between application servers and RAID systems. Hitachi Dynamic Link Manager™ therefore provides increased reliability and performance. Supported platforms include AIX®, Sun Solaris™, Windows NT®, and Windows 2000®.

3.Host Failover

Host failover software supports a cluster of host processors in which one of the hosts automatically takes over the workload of any failed host in the cluster. This “take-over” includes the reassignment of networks and peripherals, as well as the restarting of applications. Host clustering can also be used to create fault-tolerant work loads and scale processor capability while sharing network and disk resources.

The Lightning 9900™ supports all major open systems clustering schemes including: Compaq TruCluster®, HP® MC Service Guard, HP® MC Lock Manager, IBM® RS6000 and SP HACMP, Windows NT/2000®, Microsoft® Cluster Server, NCR® UNIX® SVR4 Lifekeeper, IBM DYNIX/ptx ATAP®, and VERITAS ClusterServer™ for Sun Solaris™.

Alternate pathing automatically switches the I/O load on a failed primary path.

Hitachi Dynamic Link Manager™ provides load balancing in addition to path failover.

One of the hosts automatically takes over the workload of any failed host in the cluster.

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Contents Page Page Hitachi Data Systems Table of Contents Hitachi Data Systems Read-aheadfor High-performanceSequential ReadsRemote Copy Hitachi NanoCopy Implementation Service Hitachi Data SystemsTable of Figures Tables Hitachi Data SystemsIntroduction The most advanced design in storageLightning 9900 Series Product Offerings The most powerful storage system in the world Hitachi Data SystemsIntroduction Hitachi Data Systems Mirrored cache instead of single image cache.1Introduction Hitachi Data Systems The Lightning 9900 Series PackagingModel 9960 Packaging Model 9960 Control FrameHitachi Data Systems Model 9960 Array FramesThe Lightning 9900 Series Packaging Model 9910 PackagingHitachi Data Systems Figure 7 – A 9910 single-cabinetstorage subsystemFront-endDesign of the Hitachi LightningSeries Hitachi Data Systems About the Fibre Channel Interface BoardsPage Hitachi Data Systems Bandwidth of Supported Host InterfacesNumber of Host Interfaces Supported Internal Switched Hi-StarArchitecture – AnHierarchical Star Network The Internal Hi-StarArchitectureHitachi Data Systems ArchitecturePage Hitachi Data Systems The 9960 Provides 32GB of Fully Addressable CacheRead-aheadfor High-performanceSequential Reads Control Memory Hierarchical Star NetworkPage Hitachi Data Systems High Performance Back-endDesign High-speed Back-endDesignNew Fibre Channel Disk Drives Command Tag Queuing greatly improves performance Maximum Configuration of ACPs and DisksThe Importance of Command Tag Queuing CTQ Hitachi Data SystemsCapacities and RAID Architecture Storage Capacity of the Lightning 9900 SeriesRAID-1+ RAID-5- Distributed ParityHitachi Data Systems High-densityDisk Drive Assemblies HDDsApplication Service Levels Hitachi High-Availability Software ImprovesHitachi Data Systems Open Systems High-AvailabilityMiddleware Support3.Host Failover Standard Hot-swapand Redundant Power Supplies Hitachi Data Systems4.Parallel Database Clustering Standard Redundant Fans for Cooling Unmatched Competitive Advantage in RAID ChoicesHitachi Data Systems Performance Considerations Truly Scalable PerformanceHitachi Data Systems Test ResultsSoftware Solutions Are the Best in the WorldSoftware Solutions for the The Lightning 9900 SeriesFigure 24 – Hitachi Data Systems offers a broad range of remote copy, data duplication, and data migration software solutions Hitachi Data SystemsRemote Copy PiT CopyData Migration and warehousing Hitachi Data SystemsCentralized and Open Systems ManagementSoftware Simplifies IT Operations A powerful and open systems management philosophyHiCommand is an important Hitachi management tool in that it provides a comprehensive storage management software framework that enables an enterprise to manage all supported Hitachi storage products and many Hitachi software solutions Hitachi Data SystemsThe components of HiCommand Service Level Management Hitachi Data SystemsHitachi Resource Manager Deployment ManagementHitachi LUN Manager is an open systems management utility. With Hitachi LUN Manager, open systems Logical Units LUNs can be defined, configured, and maintained. There is no more waiting for the hardware vendor to come and make configuration changes. Hitachi LUN Manager includes an easy-to-use, GUI-basedinterface that allows the easy definition of paths for LUNs, the reconfiguration of LUN-to-portassignments, or the viewing of the Lightning 9900 remote service information messages. Because the Hitachi LUN Manager can assign multiple paths to a single LUN, support of alternate path failover, path load balancing, and clustered systems is possible. Running on a standard Windows-basedPC connected to the storage subsystems by a dedicated LAN, Hitachi LUN Manager can support up to eight Lightning 9900 systems Hitachi Data Systems Hitachi CruiseControlStorage Maximizer Hitachi SANtinelHitachi Data Systems Professional Services and Support Professional Services OverviewData Protection Services Cost of Risk Analysis methodology CORAData Protection Services Lab Remote Copy Assessment and Implementation ServiceHitachi NanoCopy Implementation Service Hitachi Data SystemsProfessional Services and Support Continuous Availability ServiceOn-lineData Migration Service SAN servicesSoftware Portfolio Review and Analysis Service Hitachi Data SystemsSystem Configurations for the Performance ExperimentHitachi Data Systems The 7700E used all 6GB drivesGlossary of Terms 10BaseT100BaseT ACP pairHitachi Data Systems AvailabilityBack end Business Continuity Planning BCPGlossary CARBCache CHIPHitachi Data Systems Consistency GroupsControl Frame CORA Cost of Risk AnalysisDisaster Recovery GlossaryData Duplication Data MigrationHitachi Data Systems EBCDICElectronic vaulting ESA/390Glossary FailoverFast Ethernet Fast writeFile Backup Hitachi Data SystemsFICON Front EndHitachi FlashAccess GlossaryHDmS Hitachi CruiseControlHitachi Multiplatform Backup/Restore Hitachi Data SystemsHitachi InstantSplit Hitachi LUN ManagerHitachi Rapid Recovery GlossaryHitachi Resource Manager Hitachi SANtinelHitachi Data Systems HXRC Hitachi Extended Remote CopyHYPERtape JavaLogical Volume GlossaryLightning 9900 Series Logical UnitHitachi Data Systems MBCPMIPS Meta-dataGlossary MTBFMTTR NanoCopyHitachi Data Systems On-linesystemOpen system Operating SystemRecovery Time GlossaryRAID RAID ControllersSwitch Hitachi Data SystemsSCSI SnapshotVirtual Logical Volume Image Manager VolumeGlossary SynchronousHitachi Data Systems Warm siteWorkload Hitachi Data Systems Worldwide Offices Corporate HeadquartersAsia Headquarters Australia/New Zealand Headquarters
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