Hitachi 9960 Glossary, Lightning 9900 Series, Logical Unit Number, Logical Volume, Lpar, Luse

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Glossary

Lightning 9900™ Series

The Lightning 9900™ Series was announced in June 2000 (Lightning 9960™) and November (Lightning 9910™). It represents a major advance in enterprise-class storage systems with its Hierarchical Star Network switched internal architecture, which provides for many times more simultaneous transfers to and from the host compared to shared bus architectures.

Logical Unit

The SCSI term for a logical disk drive.

Logical Unit Number

See LUN.

Logical Volume

The storage medium associated with a logical disk drive. A logical volume typically resides on one or more storage devices. A host system sees a logical volume as a physical volume, although it does not correlate directly with a physical disk drive.

LUN

Logical Unit or Logical Unit Numbers. A SCSI term for the field in an identifying message that is used to select a logical unit on a given target.

LPAR

Logical partition is an IBM ESA/390® term for a set of functions that create the programming environment that is defined by the ESA/390® architecture. ESA/390® architecture uses this term when more than one LPAR is established on an ESA/390 server. An LPAR is conceptually similar to a virtual machine environment except that the LPAR is tied to one or more physical processors in a tightly coupled multiprocessor system. Also the LPAR does not depend on an operating system to create the virtual machine environment.

LUSE

LUN Size Expansion feature. This Lightning 9900™ feature allows standard-size LUNs to be combined to create larger LUNs.

LRU

Least Recently Used. A policy for a caching algorithm that chooses to remove the data from cache which has the longest elapsed time since its last access. Least Recently Used algorithms are used in all major caching systems. The Lightning 9900™ Series’ LRU scheme keeps a table (in separate non-volatile memory) that chronicles the frequency of use of data in cache memory.

MAN

Metropolitan Area Networks. Networks within a metropolitan area, which might for example, be used for a city government.

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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 CruiseControl Hitachi Multiplatform Backup/Restore Hitachi Data Systems Hitachi 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