Hitachi 9960 manual Glossary, Synchronous, Tach, Veritas, Virtual Logical Volume Image Manager

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Synchronous

Glossary

Synchronous

Synchronous communications occurs when the transmission of data between two devices is synchronized with a clocking scheme or other technique. The sender and receiver need to synchronize with one another before data is sent. In synchronous communication the bit stream and the clock pulse are synchronized by a special bit transition pattern in the digital signal creating an exactly timed stream of bits from the sending device to the receiving device. An example of such a mechanism is bipolar encoding. Synchronous communication is either character or bit oriented. Character oriented synchronous transmissions are used to send blocks of characters such as found in ASCII (American Standard Code for Information Interchange) files. Bit oriented synchronous communication is used primarily for the transmission of binary data.

See also Asynchronous, ASCII, Binary and EBCDIC, HRC, HORC.

Tach

Abbreviation for Tachyon Fibre Channel interface.

TB

A Terabyte (TB) equals 1000 Gigabytes. Some vendors today define a terabyte as 1024 GB, causing confusion in the industry.

TCP

Transmission Control Protocol or TCP is a transport layer component of the Internet’s TCP/IP protocol suite. It sits above IP in the protocol stack and provides reliable data delivery services over connection-oriented links. TCP uses IP to deliver information across a network and makes up for the deficiency of IP providing a guarantee of reliable delivery services that IP does not. TCP messages and data are encapsulated into IP datagrams and IP delivers them across the network.

VERITAS®

A Mountain View, California software company that develops and supports volume and file management software products for a variety of Unix® and Windows® platforms.

Virtual Logical Volume Image Manager

Virtual Logical Volume Image Manager (VLVI) is a software utility in the Resource Manager 7000/9000™ that allows for configuration of RAID configurations, create, delete, verify, rebuild, tune, and abort operations. See also RAID and the Freedom 9000 Resource Manager 7000/9000™.

Volume

An ESA/390® term for the information recorded on a single disk unit or recording medium. Indirectly, a volume can refer to the unit of recording medium itself. On a non-removable medium storage device such as a disk drive, the terms may also refer, indirectly, to the storage device that is associated with the volume. When a user stores multiple volumes on a single storage medium transparent to the program, the volumes are referred to as logical volumes.

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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 Model 9960 Packaging The Lightning 9900 SeriesPackaging 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 Hierarchical Star Network Internal SwitchedHi-StarArchitecture – An The Internal Hi-StarArchitectureHitachi Data Systems ArchitecturePage Read-aheadfor High-performanceSequential Reads Hitachi Data SystemsThe 9960 Provides 32GB of Fully Addressable Cache Control Memory Hierarchical Star NetworkPage Hitachi Data Systems High Performance Back-endDesign High-speed Back-endDesignNew Fibre Channel Disk Drives The Importance of Command Tag Queuing CTQ Command Tag Queuing greatly improves performanceMaximum Configuration of ACPs and Disks Hitachi Data SystemsRAID-1+ Capacities and RAID ArchitectureStorage Capacity of the Lightning 9900 Series 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 for the Software Solutions Are theBest in the World 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 SystemsSoftware Simplifies IT Operations Centralized and OpenSystems Management 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 Hitachi Resource Manager Service Level ManagementHitachi Data Systems 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 Data Protection Services Professional Services and SupportProfessional Services Overview Cost of Risk Analysis methodology CORAHitachi NanoCopy Implementation Service Data Protection Services LabRemote Copy Assessment and Implementation Service Hitachi Data SystemsOn-lineData Migration Service Professional Services and SupportContinuous Availability Service SAN servicesSoftware Portfolio Review and Analysis Service Hitachi Data SystemsSystem Configurations for the Performance ExperimentHitachi Data Systems The 7700E used all 6GB drives100BaseT Glossary of Terms10BaseT ACP pairBack end Hitachi Data SystemsAvailability Business Continuity Planning BCPCache GlossaryCARB CHIPControl Frame Hitachi Data SystemsConsistency Groups CORA Cost of Risk AnalysisData Duplication Disaster RecoveryGlossary Data MigrationElectronic vaulting Hitachi Data SystemsEBCDIC ESA/390Fast Ethernet GlossaryFailover Fast writeFICON File BackupHitachi Data Systems Front EndHDmS Hitachi FlashAccessGlossary Hitachi CruiseControlHitachi InstantSplit Hitachi Multiplatform Backup/RestoreHitachi Data Systems Hitachi LUN ManagerHitachi Resource Manager Hitachi Rapid RecoveryGlossary Hitachi SANtinelHYPERtape Hitachi Data SystemsHXRC Hitachi Extended Remote Copy JavaLightning 9900 Series Logical VolumeGlossary Logical UnitMIPS Hitachi Data SystemsMBCP Meta-dataMTTR GlossaryMTBF NanoCopyOpen system Hitachi Data SystemsOn-linesystem Operating SystemRAID Recovery TimeGlossary RAID ControllersSCSI SwitchHitachi Data Systems SnapshotGlossary Virtual Logical Volume Image ManagerVolume SynchronousHitachi Data Systems Warm siteWorkload Asia Headquarters Hitachi Data Systems Worldwide OfficesCorporate Headquarters Australia/New Zealand Headquarters
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