Hitachi Copy-On-Write Snapshot User Guide
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Hitachi Virtual Storage Platform Hitachi Copy-on-Write Snapshot User Guide FASTFIND LINKS Document Organization Product Version Getting Help Contents MK-90RD7013-11 © 2010 - 2014 Hitachi, Ltd. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or stored in a database or retrieval system for any purpose without the express written permission of Hitachi, Ltd. Hitachi, Ltd., reserves the right to make changes to this document at any time without notice and assumes no responsibility for its use. This document contains the most current information available at the time of publication. When new or revised information becomes available, this entire document will be updated and distributed to all registered users. Some of the features described in this document might not be currently available. 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Microsoft product screen shots are reprinted with permission from Microsoft Corporation. ii Hitachi Virtual Storage Platform Hitachi Copy-on-Write Snapshot User Guide Contents Preface . .ix Intended audience. x Product version . x Document revision level . x Referenced documents. x Changes in this revision . xi Document organization . xi Document conventions. xii Convention for storage capacity values . .xiii Accessing product documentation . .xiii Getting help . .xiv Comments . .xiv 1 Overview of Copy-on-Write Snapshot . 1-1 Copy-on-Write Snapshot software . 1-2 How Copy-on-Write Snapshot works . 1-2 Volume pairs: P-VOLs and V-VOLs . 1-2 Data pools . 1-4 Components . 1-4 Licenses and capacity . 1-4 Consistency groups . 1-5 Interfaces for performing Copy-on-Write Snapshot operations . 1-5 The Storage Navigator . 1-5 Command Control Interface . 1-6 Pair status . 1-6 2 Copy-on-Write Snapshot planning and design . 2-1 Consistency group system requirements . 2-2 Data pool requirements and restrictions. 2-4 Planning pair volumes . 2-5 Planning V-VOLs and data pools . 2-5 iii Hitachi Virtual Storage Platform Hitachi Copy-on-Write Snapshot User Guide Sizing the data pool workflow . 2-6 Calculating the number of Copy-on-Write Snapshot pairs . 2-7 Calculating SS pairs when creating external volumes or V-VOLs . 2-7 Calculating maximum SS pairs based on differential tables workflow . 2-7 Calculating maximum SS pairs based on shared memory workflow. 2-9 Calculate the capacity of the pool management block . 2-11 Capacity of pool association information . 2-12 Calculating maximum pairs based on pair tables. 2-12 Determining maximum pairs allowed on your system . 2-12 Planning for splitting pairs in consistency groups . 2-12 Requirements and restrictions for the At-Time Split operation . 2-13 Pair inclusion in At-Time Split operations workflow . 2-13 Consistency maintenance workflow when sharing SS P-VOLs with UR or TC volumes . 2-14 Snapshot secondary volume consistency maintenance . 2-16 External volumes. 2-16 External-volume failures. 2-17 3 Copy-on-Write Snapshot installation and configuration . 3-1 Installing and removing Copy-on-Write Snapshot . 3-2 Configuration workflow . 3-2 Creating data pools . 3-2 Creating V-VOLs . 3-4 Setting up the Command Control Interface command device . 3-5 4 Sharing Copy-on-Write Snapshot volumes. 4-1 Interoperability with other software applications and functions . 4-2 The Data Retention Utility and access attributes. 4-3 Dynamic Provisioning. 4-4 Resource Partition Manager . 4-5 ShadowImage. 4-5 Restrictions when sharing P-VOLs . 4-7 TrueCopy and Universal Replicator . 4-7 TC and UR volume backup in 3DC multi-target configuration . 4-8 Volume Migration . 4-9 Thin Image. 4-9 5 Pair operations. 5-1 Pair operations . 5-2 Checking the pair status . 5-2 Pair creation workflow . 5-2 Pair creation . 5-3 Configuring pairs. 5-3 Removing and moving volumes. 5-4 iv Hitachi Virtual Storage Platform Hitachi Copy-on-Write Snapshot User Guide Creating pairs . 5-5 Pair split . 5-9 Splitting pairs . 5-10 Splitting pairs in consistency groups at a pre-determined time . 5-10 Pair resynchronization and restoration . 5-11 Resynchronizing and restoring pairs . 5-11 Pair deletion . 5-12 Deleting pairs . 5-12 6 Copy-on-Write Snapshot monitoring and maintenance . 6-1 Monitoring the storage system . 6-2 Monitoring pair information, license capacity, status . 6-2 Pair status definitions . 6-2 Monitoring pair properties . 6-3 Monitoring synchronous rates . 6-4 Monitoring consistency groups . 6-4 Monitoring pair operations history . 6-4 Monitoring pool information . ..