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2 Dell PS Series Storage: Choosing a Member RAID Policy | TR1020 | v 4.7
Table of Contents
1 Introduction to member RAID policies .......................................................................................................................... 4
1.1 RAID policy descriptions ..................................................................................................................................... 5
2 RAID policy availability and performance comparisons ............................................................................................... 6
2.1 RAID policy disk failure protection and reliability ................................................................................................ 6
2.2 RAID policy impact on performance ................................................................................................................... 9
2.3 Spare disks ....................................................................................................................................................... 12
2.4 Examples of data protection with different RAID policies ................................................................................. 13
2.5 Relative capacity utilization by RAID policy ...................................................................................................... 16
3 Setting the member RAID policy ................................................................................................................................ 17
4 Displaying the RAID level space distribution .............................................................................................................. 18
5 PS Series array disk layout ........................................................................................................................................ 19
6 Converting or migrating from a member RAID policy................................................................................................. 20
6.1 Large disk policy for RAID 50 and RAID 10 ..................................................................................................... 20
6.2 Online conversion ............................................................................................................................................. 20
6.3 Array evacuation ............................................................................................................................................... 22
6.4 Online volume migration ................................................................................................................................... 22
6.5 Backup and restore .......................................................................................................................................... 24
7 Summary .................................................................................................................................................................... 25
A 12-Disk PS Series array RAID configurations ............................................................................................................ 26
B 14-Disk PS Series array RAID configurations ............................................................................................................ 27
C 16-Disk PS Series array RAID configurations ............................................................................................................ 28
C.1 RAID 50 ............................................................................................................................................................ 28
C.2 RAID 5 .............................................................................................................................................................. 29
C.3 RAID 6 .............................................................................................................................................................. 29
D 48-Disk PS Series array RAID configurations ............................................................................................................ 31
E 42 or 84-disk PS Series RAID configurations ............................................................................................................ 32
F Technical support and resources ............................................................................................................................... 33