Hitachi 9900 Series, 9960 manual Hitachi Data Systems, Architecture

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Architecture

Hitachi Data Systems

The Cache Switch Provides Non-blocking Switched Access to Cache

The CSW is at the heart of the Lightning 9900Series.

At the heart of the C-HSN is the Cache Switch (CSW). Together, these four switches (in the 9960) form the internal start using parallel switch fabric bus (PSFB) of the C-HSN. The CSW is a specially designed crossbar switch that functions as a combination MUX, path arbitrator, and non-blocking network switch. The CSW functions as a MUX by supporting eight paths into the processor side of each switch and four paths to the cache modules (8 to 4 routing). All total, there are 32 paths at the processor side of the fabric network and 16 paths to the cache modules from the cache side of the fabric network.

As shown in Figure 13, Cache Memory Arbitrator (CARB) allows the CSW to act as an arbitrator, handling the access and addressing to and from the cache modules. The CSW also manages the non-blocking paths between the processors to and from the cache.

Figure 13 – The CSW and CARBs provide non-blocking channel access to all cache.

The Path Bandwidth Between the CSW and CHIPs or ACPs is 6.4GB/sec

The paths that connect the Client Host Interface Processors, or CHIPs (through the Data Adapters – DTA) to the CSW and the CSW to the cache modules are each 16 bits wide, plus 2 bits for parity. The bandwidth of each path is 200MB/sec. This is the data transfer rate of a 16-bit wide path (parallel) clocked at 100MHz (16 bits at 100MHz equals 200MB/sec). As mentioned, there are 32 paths from the processor modules of the Lightning 9960(ACPs and CHIPs) to the ports of the CSWs. This equals 6.4GB/sec

(32 paths at 200MB/sec) of bandwidth to the processor side of the switched fabric (when all 16 component modules are installed).

The Path Bandwidth Between the CSW and the Cache Adapters (CAs) is 3.2GB/sec

The bandwidth between the cache side of the Cache Switch (CSW) and the cache modules is 3.2GB/sec (16 paths at 200MB/sec) total. This bandwidth will always be 3.2GB/sec as long as the four CSWs and the four cache modules are installed and functioning.

Advantages of a Switched Architecture Compared to a Shared Bus

Architecture

When considering the advantages of a switched bus architecture to that of a shared bus architecture (Figure 14), the number of operations that can be present on the buses simultaneously is the key difference.

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Contents Page Page Hitachi Data Systems Table of Contents Read-aheadfor High-performanceSequential Reads Hitachi Data SystemsRemote Copy Hitachi Data Systems Hitachi NanoCopy Implementation ServiceTable of Figures Hitachi Data Systems TablesThe most advanced design in storage IntroductionLightning 9900 Series Product Offerings Hitachi Data Systems The most powerful storage system in the worldIntroduction Mirrored cache instead of single image cache.1 Hitachi Data SystemsIntroduction Hitachi Data Systems Packaging The Lightning 9900 SeriesModel 9960 Packaging Model 9960 Control FrameModel 9960 Array Frames Hitachi Data SystemsModel 9910 Packaging The Lightning 9900 Series PackagingFigure 7 – A 9910 single-cabinetstorage subsystem Hitachi Data SystemsHitachi Lightning Front-endDesign of theSeries About the Fibre Channel Interface Boards Hitachi Data SystemsPage Bandwidth of Supported Host Interfaces Hitachi Data SystemsNumber of Host Interfaces Supported Hi-StarArchitecture – An Internal SwitchedHierarchical Star Network The Internal Hi-StarArchitectureArchitecture Hitachi Data SystemsPage The 9960 Provides 32GB of Fully Addressable Cache Hitachi Data SystemsRead-aheadfor High-performanceSequential Reads Control Memory Hierarchical Star NetworkPage Hitachi Data Systems High-speed Back-endDesign High Performance Back-endDesignNew Fibre Channel Disk Drives Maximum Configuration of ACPs and Disks Command Tag Queuing greatly improves performanceThe Importance of Command Tag Queuing CTQ Hitachi Data SystemsStorage Capacity of the Lightning 9900 Series Capacities and RAID ArchitectureRAID-1+ RAID-5- Distributed ParityHigh-densityDisk Drive Assemblies HDDs Hitachi Data SystemsHitachi High-Availability Software Improves Application Service LevelsOpen Systems High-AvailabilityMiddleware Support Hitachi Data Systems3.Host Failover Hitachi Data Systems Standard Hot-swapand Redundant Power Supplies4.Parallel Database Clustering Unmatched Competitive Advantage in RAID Choices Standard Redundant Fans for CoolingHitachi Data Systems Truly Scalable Performance Performance ConsiderationsTest Results Hitachi Data SystemsBest in the World Software Solutions Are theSoftware Solutions for the The Lightning 9900 SeriesHitachi Data Systems Figure 24 – Hitachi Data Systems offers a broad range of remote copy, data duplication, and data migration software solutionsPiT Copy Remote CopyData Migration Hitachi Data Systems and warehousingSystems Management Centralized and OpenSoftware Simplifies IT Operations A powerful and open systems management philosophyHitachi Data Systems HiCommand 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 solutionsThe components of HiCommand Hitachi Data Systems Service Level ManagementHitachi 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 CruiseControl Hitachi Data SystemsHitachi SANtinel Storage MaximizerHitachi Data Systems Professional Services Overview Professional Services and SupportData Protection Services Cost of Risk Analysis methodology CORARemote Copy Assessment and Implementation Service Data Protection Services LabHitachi NanoCopy Implementation Service Hitachi Data SystemsContinuous Availability Service Professional Services and SupportOn-lineData Migration Service SAN servicesHitachi Data Systems Software Portfolio Review and Analysis Servicethe Performance Experiment System Configurations forThe 7700E used all 6GB drives Hitachi Data Systems10BaseT Glossary of Terms100BaseT ACP pairAvailability Hitachi Data SystemsBack end Business Continuity Planning BCPCARB GlossaryCache CHIPConsistency Groups Hitachi Data SystemsControl Frame CORA Cost of Risk AnalysisGlossary Disaster RecoveryData Duplication Data MigrationEBCDIC Hitachi Data SystemsElectronic vaulting ESA/390Failover GlossaryFast Ethernet Fast writeHitachi Data Systems File BackupFICON Front EndGlossary Hitachi FlashAccessHDmS Hitachi CruiseControlHitachi Data Systems Hitachi Multiplatform Backup/RestoreHitachi InstantSplit Hitachi LUN ManagerGlossary Hitachi Rapid RecoveryHitachi Resource Manager Hitachi SANtinelHXRC Hitachi Extended Remote Copy Hitachi Data SystemsHYPERtape JavaGlossary Logical VolumeLightning 9900 Series Logical UnitMBCP Hitachi Data SystemsMIPS Meta-dataMTBF GlossaryMTTR NanoCopyOn-linesystem Hitachi Data SystemsOpen system Operating SystemGlossary Recovery TimeRAID RAID ControllersHitachi Data Systems SwitchSCSI SnapshotVolume Virtual Logical Volume Image ManagerGlossary SynchronousWarm site Hitachi Data SystemsWorkload Corporate Headquarters Hitachi Data Systems Worldwide OfficesAsia Headquarters Australia/New Zealand Headquarters