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Disk Management IBM i Version 7.2 Systems management Disk management IBM Note Before using this information and the product it supports, read the information in “Notices” on page 141. This edition applies to IBM i 7.2 (product number 5770-SS1) and to all subsequent releases and modifications until otherwise indicated in new editions. This version does not run on all reduced instruction set computer (RISC) models nor does it run on CISC models. This document may contain references to Licensed Internal Code. Licensed Internal Code is Machine Code and is licensed to you under the terms of the IBM License Agreement for Machine Code. © Copyright International Business Machines Corporation 2004, 2013. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Disk management..................................................................................................1 What's new for IBM i 7.2..............................................................................................................................1 PDF file for Disk Management..................................................................................................................... 1 Getting started with disk management.......................................................................................................2 Components of disk storage.................................................................................................................. 2 Finding the logical address for a disk storage component.............................................................. 3 Planning for disk management.............................................................................................................. 4 Requirements for disk management................................................................................................4 Enabling and accessing disk units.............................................................................................. 4 Setting up communication.......................................................................................................... 4 Evaluating the current configuration...........................................................................................5 Printing your disk configuration.................................................................................................. 5 Calculating disk space requirements..........................................................................................5 Setting up your disks.........................................................................................................................6 Configuring disks on a new system.............................................................................................6 Replacing a disk unit....................................................................................................................7 Renaming a disk unit................................................................................................................... 7 Formatting a disk unit..................................................................................................................8 Scanning a disk unit.....................................................................................................................8 Retrieving disk unit logs.............................................................................................................. 8 Disk protection............................................................................................................................................. 9 Comparing disk protection options........................................................................................................9 Disk protection types........................................................................................................................... 10 Device parity protection................................................................................................................. 10 Device parity protection concepts............................................................................................ 10 Starting device parity protection.............................................................................................. 21 Starting device parity protection with hot spare protection ................................................... 21 Managing device parity protection............................................................................................22 Device parity protection examples........................................................................................... 24 Write cache and auxiliary write cache IOA.................................................................................... 25 Mirrored protection.........................................................................................................................26 Mirrored protection concepts................................................................................................... 26 Planning for mirrored protection.............................................................................................. 30 Setting up mirrored protection................................................................................................. 42 Managing mirrored protection.................................................................................................. 44 Hot spare protection.......................................................................................................................45 Hot spare protection concepts................................................................................................. 45 Planning for hot spare protection............................................................................................. 47 Starting hot spare protection....................................................................................................47 Managing hot spare protection................................................................................................. 47 Troubleshooting hot spare protection......................................................................................49 Multipath disk units........................................................................................................................ 50 Considerations for multipath disk units....................................................................................50 Disk protection checklists....................................................................................................................52 Adding a new IOA........................................................................................................................... 52 Adding disk units to an existing IOA.............................................................................................. 53 Removing disk units that have device parity protection from a disk pool without mirrored protection...................................................................................................................................54 Removing disk units that have device parity protection from a disk pool with mirrored protection...................................................................................................................................55 Upgrading the load source disk unit with device parity protection...............................................56 iii Adding disk units without disk protection......................................................................................61 Moving disk units between mirrored disk pools............................................................................ 62 Upgrading the load source disk unit with local mirroring using non-configured disk units......... 63 Upgrading the load source disk unit with local mirroring using newly installed disk units..........69 Disk pools...................................................................................................................................................74 Using disk pool..................................................................................................................................... 74 Types of disk pools...............................................................................................................................75 System disk pool.............................................................................................................................75 User disk pools................................................................................................................................76 Basic disk pools.............................................................................................................................. 76 Independent disk pools..................................................................................................................76 Primary, Secondary, UDFS disk pools............................................................................................ 77 Disk pool groups............................................................................................................................. 77 Disk pool concepts............................................................................................................................... 78 Contrasting basic and independent disk pools..............................................................................78
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