Hitachi Virtual Storage Platform G1000 Hitachi Virtual Storage Platform G1000 (VSP G1000) storage systems.…

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  • Product Version

    Contents

    Getting Help

    FASTFIND LINKS

    Hitachi Virtual Storage Platform G1000Hitachi TrueCopy User Guide

    MK-92RD8019-02

  • 2014 Hitachi, Ltd. All rights reserved.

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    iiHitachi TrueCopy User Guide

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  • Contents

    Preface.................................................................................................. ixIntended audience..................................................................................................... xProduct version..........................................................................................................xRelease notes............................................................................................................ xDocument revision level..............................................................................................xChanges in this revision..............................................................................................xReferenced documents.............................................................................................. xiDocument conventions.............................................................................................. xiConvention for storage capacity values...................................................................... xiiAccessing product documentation............................................................................. xiiiGetting help............................................................................................................ xiiiComments...............................................................................................................xiii

    1 TrueCopy overview............................................................................... 1-1How TrueCopy works ............................................................................................. 1-3Typical components ............................................................................................... 1-3Storage systems..................................................................................................... 1-4Volume pairs ......................................................................................................... 1-5Data path ..............................................................................................................1-5Consistency groups ................................................................................................1-5Interfaces ............................................................................................................. 1-6Failover software ................................................................................................... 1-6Overview of initial, update copy operations ..............................................................1-6

    Initial copy ......................................................................................................1-7Update copy ....................................................................................................1-7

    Pair status..............................................................................................................1-8

    2 Requirements and specifications............................................................ 2-1System requirements and specifications....................................................................2-2

    3 Planning for TrueCopy...........................................................................3-1Storage system preparation.....................................................................................3-2

    Cache, additional shared memory requirements..................................................3-2Requirements for VSP G1000 with earlier model storage systems.........................3-2

    iiiHitachi TrueCopy User Guide

  • System options.................................................................................................3-3System performance considerations......................................................................... 3-3

    Determining Round Trip Time............................................................................3-4Determining Minimum Number of Remote Paths................................................. 3-6Analyzing workload, planning data paths............................................................3-6

    Planning pairs and pair volumes...............................................................................3-7Pair volume requirements and recommendations................................................ 3-7Allowing I/O to the S-VOL................................................................................. 3-9Allowing I/O to the P-VOL after a splitFence Level options................................3-9Differential data .............................................................................................3-10Maximum number of pairs supported............................................................... 3-10

    Calculating maximum number of pairs.................................................... 3-10Priority for initial copy operations and scheduling order..................................... 3-12

    Example 1: more initial copies than previously specified........................... 3-12Example 2: initial copy started, new pairs added......................................3-12

    Consistency group planning................................................................................... 3-13Consistency group for pairs in one primary and one secondary VSP G1000......... 3-13Consistency group for pairs in multiple primary and secondary systems.............. 3-14Consistency group requirements ..................................................................... 3-15

    Requirements for a CTG for one primary and one secondary system......... 3-16Requirements for a CTG for multiple primary and secondary systems........ 3-16

    Assigning pairs to a consistency group............................................................. 3-17Assigning pairs belonging to one primary and secondary system...............3-17Assigning pairs belonging to multiple primary and secondary systems....... 3-17

    Split behaviors for pairs in a CTG..................................................................... 3-18Host access after split............................................................................3-20Pair status before and after a split operation........................................... 3-20

    Consistency group 127....................................................................................3-21CTG 127 behavior and restrictions when a pair is suspended.................... 3-21CTG 127 behavior and restrictions when the data path fails......................3-22

    Notes when you remove or resynchronize pairs by Business Continuity Manager. 3-23Host failover software........................................................................................... 3-23Data path requirements and configurations.............................................................3-23

    Bandwidth requirements........................................................

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