Dell EqualLogic PS6100 series - Page 6

March 2013 Dell EqualLogic Configuration Guide v14.1 v
3.1
Setting the RAID Policy for a member ............................................................................................. 3-25
3.2 Guidelines for choosing a RAID policy ............................................................................................ 3-25
3.2.1 RAID level ...................................................................................................................................... 3-26
3.2.2 Drive configuration ..................................................................................................................... 3-26
3.2.3 Spare drive policy ........................................................................................................................ 3-26
3.3 RAID level characteristics ................................................................................................................... 3-26
3.3.1 Performance and availability characteristics of the supported RAID levels ...................... 3-27
3.4 Supported RAID policy conversions ................................................................................................ 3-28
4 Capacity planning........................................................................................................................................ 4-30
4.1 RAID 6 drive layouts and total reported usable storage ............................................................... 4-30
4.2 RAID 10 drive layouts and total reported usable storage ............................................................. 4-32
4.3 RAID 50 drive layouts and total reported usable storage ............................................................ 4-33
4.4 RAID 5 drive layouts and total reported usable storage ............................................................... 4-34
4.5 Array RAID configurations and associated RAID sets ................................................................... 4-35
5 PS Series array concepts ............................................................................................................................ 5-36
5.1 Groups and pools ................................................................................................................................ 5-36
5.1.1 Pools .............................................................................................................................................. 5-36
5.2 Volumes ................................................................................................................................................ 5-38
5.2.1 Volume attributes ........................................................................................................................ 5-38
5.2.2 Volume features .......................................................................................................................... 5-39
5.3 Snapshots and clones ......................................................................................................................... 5-39
5.3.1 Clones ........................................................................................................................................... 5-40
5.4 Thin provisioning ................................................................................................................................. 5-40
5.4.1 Template volumes and thin clones .......................................................................................... 5-41
6 Array firmware features .............................................................................................................................. 6-42
6.1 Replication ............................................................................................................................................ 6-42
6.1.1 Replication limits ......................................................................................................................... 6-42
6.1.2 Replication paths ......................................................................................................................... 6-43
6.1.3 Replication process ..................................................................................................................... 6-44
6.1.4 Fast failback .................................................................................................................................. 6-46
6.1.5 Sizing Replica Reserve and Delegated Space ......................................................................... 6-46
6.1.6 Effect of TCP Window Size on Latency across WAN links ...................................................6-48
6.1.7 Replication partner compatibility .............................................................................................6-48
6.1.8 Clustering ...................................................................................................................................... 6-49