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  • Product Version

    Contents

    Getting Help

    FASTFIND LINKS

    Hitachi Virtual Storage Platform Hitachi Universal Replicator for Mainframe User Guide

    MK-90RD7031-14

  • Hitachi Virtual Storage Platform Hitachi Universal Replicator for Mainframe User Guide

    ii

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  • iiiHitachi Virtual Storage Platform Hitachi Universal Replicator for Mainframe User Guide

    Contents

    Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiIntended audience. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiiProduct version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiiDocument revision level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiiChanges in this revision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiiReferenced documents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiiiDocument organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiiiDocument conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xivConvention for storage capacity values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvAccessing product documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvGetting help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvComments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvi

    1 Universal Replicator for Mainframe overview . . . . . . . . . . . . . . . . 1-1Universal Replicator for Mainframe software . . . . . . . . . . . . . . . . . . . . . . . . . 1-2How Universal Replicator for Mainframe works . . . . . . . . . . . . . . . . . . . . . . . . 1-2Hardware and software components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

    VSP storage systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5Main and remote control units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

    Pair volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Journal volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Journals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Data path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7Extended consistency groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Storage Navigator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Business Continuity Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

    Reference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Overview of copy operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

    Initial copy operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Update copy operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

    Read and write I/O during remote copy . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9Differential data management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

  • Hitachi Virtual Storage Platform Hitachi Universal Replicator for Mainframe User Guide

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    S-VOL write option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10S-VOL read option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10Pair status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

    2 Requirements and specifications . . . . . . . . . . . . . . . . . . . . . . . . . 2-1System requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2Business Continuity Manager specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Command device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

    3 Planning volumes, VSP systems . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Plan and design workflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Assessing business requirements for data recovery . . . . . . . . . . . . . . . . . . . . 3-3

    Determining your RPO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Write-workload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

    Measuring write-workload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Sizing journal volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Planning journals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5Data transfer speed considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

    RAID group configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6Fibre-channel port configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

    Planning journal volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7Host I/O time stamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

    Planning pair volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8Data and journal volume specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9Duplicating VOLSERs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9Maximum number of pairs allowed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

    Calculating maximum number of pairs . . . . . . . . . . . . . . . . . . . . . . . . 3-10Maximum initial copy operations and priorities . . . . . . . . . . . . . . . . . . . . 3-12

    Disaster recovery considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13Error reporting communications (ERC) . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

    Sharing volumes with other VSP software volumes . . . . . . . . . . . . . . . . . . . . 3-14Planning URz in multiple VSPs using a consistency group . . . . . . . . . . . . . . . 3-14

    Multiple journals per CCI consistency group . . . . . . . . . . . . . . . . . . . . . 3-17Establishing connections between multiple secondary systems . . . . . . . . 3-19Planning extended consistency groups (EXCTG) . . . . . . . . . . . . . . . . . . 3-20

    Planning for previous models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20Guidelines for preparing systems for URz . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

    System option modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

    4 Planning the data path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Data path design workflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Sizing bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

    Five sizing strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Calculating bandwidth . . . . . . . . . . . . . . . . .

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