Dell EMC SC Series Storage: Synchronous Replication and ...

Technical White Paper

Dell EMC SC Series: Synchronous Replication and Live Volume

Abstract

This document provides descriptions and use cases for the Dell EMC SC Series data protection and mobility features of synchronous replication and Live Volume. December 2020

CML1064

Revisions

Revisions

Date May 2014

July 2014 November 2015 July 2016 October 2016 February 2017 July 2017 December 2017 April 2018 July 2019 September 2019 February 2020 December 2020

Description Merged synchronous replication and Live Volume documents; updated for Enterprise Manager 2014 R2 and SCOS 6.5 vSphere HA PDL update Updated for SCOS 6.7 Updated for SCOS 7.1 and DSM 2016 R2 Minor updates Updated guidance on MPIO settings for Windows Server and Hyper-V Minor updates Minor updates to section 3.4.1 Updated for SCOS 7.3 and DSM 2018 Consistent snapshot and Live Volume updates Updated link Minor updates for vSphere 6.7 Updated for DSM 2020 R1 and vSphere 7

Acknowledgments

Authors: Jason Boche, Marty Glaser, Mike Matthews, Dan Tan, Mark Tomczik, and Henry Wong

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 ? 2014?2020 Dell Inc. or its subsidiaries. All Rights Reserved. Dell Technologies, Dell, EMC, Dell EMC and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners. [12/1/2020] [Technical White Paper] [CML1064]

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Dell EMC SC Series: Synchronous Replication and Live Volume | CML1064

Table of contents

Table of contents

Revisions............................................................................................................................................................................. 2 Acknowledgments ...............................................................................................................................................................2 Table of contents ................................................................................................................................................................3 Executive summary.............................................................................................................................................................6 1 Introduction to synchronous replication........................................................................................................................7

1.1 Features of SC Series synchronous replication .................................................................................................7 1.2 Synchronous replication requirements ...............................................................................................................7 2 Data replication primer .................................................................................................................................................9 2.1 Replication methods ...........................................................................................................................................9 3 Synchronous replication features ...............................................................................................................................13 3.1 Modes of operation ...........................................................................................................................................13 3.2 Minimal recopy..................................................................................................................................................14 3.3 Asynchronous replication capabilities ..............................................................................................................15 3.4 Multiple replication topologies ..........................................................................................................................16 3.5 Live Volume ......................................................................................................................................................17 3.6 Dell Storage Manager recommendations .........................................................................................................18 3.7 Dell Storage Manager DR recovery..................................................................................................................19 3.8 Support for VMware vSphere Site Recovery Manager ....................................................................................19 4 Synchronous replication use cases............................................................................................................................20 4.1 Overview...........................................................................................................................................................20 4.2 High consistency...............................................................................................................................................20 4.3 High availability.................................................................................................................................................22 4.4 Remote database replicas................................................................................................................................25 4.5 Disaster recovery..............................................................................................................................................26 5 Live Volume overview ................................................................................................................................................34 5.1 Reference architecture .....................................................................................................................................34 5.2 Proxy data access ............................................................................................................................................36 5.3 Live Volume ALUA............................................................................................................................................37 5.4 Live Volume connectivity requirements ............................................................................................................40 5.5 Replication and Live Volume attributes ............................................................................................................42 6 Data Progression and Live Volume............................................................................................................................46 6.1 Primary and secondary Live Volume................................................................................................................46 7 Live Volume and MPIO ..............................................................................................................................................47 7.1 MPIO policies for Live Volume .........................................................................................................................47

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8 VMware vSphere and Live Volume ............................................................................................................................49 8.1 Path Selection Policies (PSP) ..........................................................................................................................49 8.2 Round Robin with Live Volume ALUA ..............................................................................................................49 8.3 Fixed .................................................................................................................................................................52 8.4 Single-site MPIO configuration .........................................................................................................................52 8.5 Multi-site MPIO configuration ...........................................................................................................................53 8.6 VMware vMotion and Live Volume ...................................................................................................................54 8.7 vSphere Metro Storage Cluster ........................................................................................................................54 8.8 Live Volume automatic failover.........................................................................................................................55 8.9 vMSC storage presentation ..............................................................................................................................55 8.10 Tiebreaker service ............................................................................................................................................58 8.11 Common automatic failover scenarios .............................................................................................................58 8.12 Detailed failure scenarios .................................................................................................................................61 8.13 Live Volume automatic restore .........................................................................................................................63 8.14 VMware DRS/HA and Live Volume ..................................................................................................................64 8.15 vSphere Metro Storage Cluster and Live Volume Requirements ....................................................................67 8.16 VMware and Live Volume managed replication ...............................................................................................68

9 Live Volume support for Microsoft Windows/Hyper-V................................................................................................70 9.1 MPIO.................................................................................................................................................................70 9.2 Round Robin.....................................................................................................................................................70 9.3 Round Robin with Subset (ALUA) ....................................................................................................................71 9.4 Windows Server support limitations with Live Volume ALUA ..........................................................................72 9.5 Failover Only.....................................................................................................................................................73 9.6 Uniform server mappings with Live Volume and Round Robin ........................................................................74 9.7 Hyper-V and Live Volume.................................................................................................................................75 9.8 SCVMM/SCCM and Performance and Resource Optimization (PRO) ............................................................76 9.9 Live Volume and Cluster Shared Volumes.......................................................................................................76 9.10 Live Volume automatic failover for Microsoft....................................................................................................77 9.11 Live Volume with SQL Server...........................................................................................................................82

10 Live Volume with Linux/UNIX .....................................................................................................................................83 10.1 Live Volume and Synchronous Replication ......................................................................................................83 10.2 Live Volume managed replication ....................................................................................................................83 10.3 Live Volume automatic failover.........................................................................................................................84 10.4 Live Volume and Linux MPIO ...........................................................................................................................84 10.5 Live Volume with ALUA ....................................................................................................................................86 10.6 Identify parent SC Series arrays for Linux storage paths.................................................................................90

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10.7 Use cases .........................................................................................................................................................93 11 Live Volume use cases ..............................................................................................................................................99

11.1 Zero-downtime SAN maintenance and data migration.....................................................................................99 11.2 Storage migration for virtual machine migration.............................................................................................100 11.3 Disaster avoidance and disaster recovery .....................................................................................................101 11.4 On-demand load distribution ..........................................................................................................................102 11.5 Cloud computing.............................................................................................................................................102 11.6 Replay Manager and Live Volume .................................................................................................................103 A Technical support and additional resources.............................................................................................................104 A.1 Related resources...........................................................................................................................................104

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Dell EMC SC Series: Synchronous Replication and Live Volume | CML1064

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