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  • H13697.12

    Technical White Paper

    Dell EMC PowerMax and VMAX All Flash: TimeFinder SNAPVX Local Replication

    Abstract This technical note explains Dell EMC™ TimeFinder™ with PowerMaxOS 5978, HYPERMAX OS 5977, Solutions Enabler 9.1, Unisphere™ 9.1, and REST API 9.1.

    September 2019

  • Revisions

    2 Dell EMC PowerMax and VMAX All Flash: TimeFinder SNAPVX Local Replication | H13697.12

    Revisions Date Description

    September 2019 Content and template update

    Acknowledgements Author: Michael Bresnahan

    The information in this publication is provided “as is.” Dell Inc. makes no representations or warranties of any kind with respect to the information in this publication, and specifically disclaims implied warranties of merchantability or fitness for a particular purpose. Use, copying, and distribution of any software described in this publication requires an applicable software license. Copyright © 2019 Dell Inc. or its subsidiaries. All Rights Reserved. Dell, EMC, Dell EMC and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners. [8/29/2019] [Technical White Paper] [H13697.12]

  • Table of contents

    3 Dell EMC PowerMax and VMAX All Flash: TimeFinder SNAPVX Local Replication | H13697.12

    Table of contents Revisions............................................................................................................................................................................. 2

    Acknowledgements ............................................................................................................................................................. 2

    Table of contents ................................................................................................................................................................ 3

    Executive summary ............................................................................................................................................................. 5

    Audience ............................................................................................................................................................................. 5

    1 Overview ....................................................................................................................................................................... 6

    1.1 Terminology ........................................................................................................................................................ 6

    1.2 Creating snapshots ............................................................................................................................................. 7

    1.3 Generation numbers ........................................................................................................................................... 7

    1.4 Time-to-Live (TTL) .............................................................................................................................................. 8

    1.5 Host writes to source .......................................................................................................................................... 9

    1.6 Redirect-On-Write ............................................................................................................................................... 9

    1.7 Replication cache ............................................................................................................................................. 10

    1.8 Shared allocations ............................................................................................................................................ 14

    1.9 Linking target volumes to snapshots ................................................................................................................ 15

    1.10 Relinking ........................................................................................................................................................... 16

    1.11 Unlinking ........................................................................................................................................................... 16

    1.12 Defining state .................................................................................................................................................... 16

    1.13 Linking larger target .......................................................................................................................................... 17

    1.14 Source volumes/linked targets SRP relationships ............................................................................................ 17

    1.15 Restore operations ........................................................................................................................................... 18

    1.16 Cascading snapshots ....................................................................................................................................... 18

    1.17 Reserved capacity ............................................................................................................................................ 20

    1.18 Interoperability .................................................................................................................................................. 20

    1.19 Storage group operations ................................................................................................................................. 23

    1.20 Secure snaps .................................................................................................................................................... 23

    1.21 Online device expansion .................................................................................................................................. 25

    1.22 Role based access controls .............................................................................................................................. 27

    2 Implementing TimeFinder SnapVX ............................................................................................................................ 28

    2.1 Creating snapshots ........................................................................................................................................... 28

    2.2 Linking, relinking, unlinking ............................................................................................................................... 30

    2.3 Restoring from snapshots ................................................................................................................................. 32

    3 TimeFinder legacy modes: Mirror, Clone, and VP Snap ............................................................................................ 34

    3.1 Interoperability between Native SnapVX and Legacy TimeFinder Modes ....................................................... 34

  • Table of contents

    4 Dell EMC PowerMax and VMAX All Flash: TimeFinder SNAPVX Local Replication | H13697.12

    3.2 Snapshots created by zDP ............................................................................................................................... 34

    3.3 TimeFinder VP Snap ........................................................................................................................................ 35

    3.4 TimeFinder Snap deprecation .......................................................................................................................... 35

    4 Summary .................................................................................................................................................................... 36

    A TimeFinder SnapVX State Table ................................................................................................................................ 37

    B Geometry compatibility mode (GCM) ......................................................................................................................... 38

    B.1 Open Replicator for Symmetrix (ORS) ............................................................................................................. 38

    B.2 TimeFinder SnapVX ......................................................................................................................................... 39

    B.3 TimeFinder Clone and VP Snap ....................................................................................................................... 39

    B.4 TimeFinder Mirror ............................................................................................................................................. 39

    C Monitoring the copy process ...................................................................................................................................... 40

    D Nocopy Linked Target behavior prior to HYPERMAX OS 5977.810.184 .................................................................. 41

    E Scheduling snapshots with Unisphere ....................................................................................................................... 42

    F System resource planning for capacity and performance .......................................................................................... 48

    F.1 Capacity planni

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