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  • H14556.6

    Technical White Paper

    Dell EMC PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices

    Abstract Dell EMC™ SRDF™/Metro™ significantly changes the traditional behavior of SRDF to better support critical applications in high availability environments. This paper is intended for IT professionals who need to understand the SRDF/Metro enhancement for the Dell EMC PowerMax, VMAX3™, and VMAX™ All Flash storage arrays.

    September 2019

  • Revisions

    2 Dell EMC PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices | H14556.6

    Revisions Date Description

    September 2019 Content and template update

    Acknowledgements Author: Michael Adams

    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. [8/28/2019] [Technical White Paper] [H14556.6]

  • Table of contents

    3 Dell EMC PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices | H14556.6

    Table of contents 1 Introduction ................................................................................................................................................................... 7

    1.1 Key differences ................................................................................................................................................... 9

    2 Configuring SRDF/Metro ............................................................................................................................................ 10

    2.1 Createpair operation ......................................................................................................................................... 10

    2.2 Device pair synchronization .............................................................................................................................. 10

    2.3 Device pair operation ........................................................................................................................................ 11

    2.4 FAST integration ............................................................................................................................................... 11

    3 SRDF/Metro resiliency ............................................................................................................................................... 12

    3.1 Understanding bias ........................................................................................................................................... 12

    3.2 Understanding the PowerMax/VMAX Witness ................................................................................................. 14

    3.3 Understanding the Virtual Witness (vWitness) ................................................................................................. 17

    3.4 PowerMax OS / Solutions Enabler 9.0 (and greater) Witness Enhancements ................................................ 19

    3.5 Use bias resiliency option ................................................................................................................................. 20

    3.6 Witness behavior during failures and recovery ................................................................................................ 20

    3.6.1 Witness selection and promotion ...................................................................................................................... 20

    3.6.2 System failures ................................................................................................................................................. 21

    3.6.3 System recovery ............................................................................................................................................... 21

    4 Example host support matrix ...................................................................................................................................... 22

    5 Features and functionality by service release ............................................................................................................ 23

    5.1 PowerMaxOS 5978 Q2 2019 Service Release ................................................................................................ 23

    5.2 PowerMax OS 5978 Q2 2018 service release ................................................................................................. 23

    5.3 HYPERMAX OS Q3 2016 service release ....................................................................................................... 23

    5.4 HYPERMAX OS 5977.811.784 service release ............................................................................................... 24

    6 SRDF/Metro device maintenance (add/move operations) ......................................................................................... 25

    6.1 Createpair –Exempt .......................................................................................................................................... 25

    6.2 Movepair –Exempt ............................................................................................................................................ 25

    6.3 Understanding the consistency exempt status ................................................................................................. 26

    7 SRDF/Metro online device expansion (ODE operations) ........................................................................................... 28

    8 Best practices ............................................................................................................................................................. 29

    8.1 Boot from SAN Support .................................................................................................................................... 29

    8.2 Host multi-pathing software .............................................................................................................................. 29

    8.3 AIX native multi-pathing software ..................................................................................................................... 29

    8.4 AIX, GPFS, and PowerPath ............................................................................................................................. 30

    8.5 Native Linux Multi-pathing Software (Linux Device Mapper) ........................................................................... 30

  • Table of contents

    4 Dell EMC PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices | H14556.6

    8.6 IBM i (AS/400) operating system ...................................................................................................................... 31

    8.7 Powerpath (version 5.7 and above).................................................................................................................. 31

    8.8 Windows 2012 with MPIO ................................................................................................................................ 31

    8.9 Veritas dynamic multi-pathing .......................................................................................................................... 31

    8.10 ESXi with native multi-pathing .......................................................................................................................... 32

    9 General restrictions and dependencies ...................................................................................................................... 33

    10 Conclusion .................................................................................................................................................................. 35

    A References ................................................................................................................................................................. 36

    B Unisphere for VMAX setup Walkthrough ................................................................................................................... 37

    C Solutions enabler SYMCLI walkthrough ..................................................................................................................... 42

    D Unisphere Createpair –Exempt Specific Steps .......................................................................................................... 57

    E Unisphere Movepair –Exempt specific steps ............................................................................................................. 67

    F Unisphere Online Device expansion (ODE) Steps ..................................................................................................... 73

    G Technical support and resources ............................................................................................................................... 77

  • Executive summary

    5 Dell EMC PowerMax and VMAX All Fla

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