Dell EqualLogic PS6210XS EqualLogic Group Manager Administrator s Guide PS Ser - Page 122
Enable and Disable a Volume RAID Preference, Prerequisites
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Table 29. 42-Drive Configuration shows the RAID set relationship for each RAID type in a 42-drive configuration. Table 29. 42-Drive Configuration RAID Policy Spare Disks RAID Set Relationship RAID 6 2 (12+2) (12+2) (10+2) RAID 10 2 (7+7) (7+7) (5+5) RAID 50 2 (12+2) (12+2) (10+2) RAID 5 2 (12+2) (12+2) (10+2) Best Practices Yes Yes Not for business-critical data Not for business-critical data Table 30. 48-Drive Configuration shows the RAID set relationship for each RAID type in a 48-drive configuration. Table 30. 48-Drive Configuration RAID Policy Spare Disks RAID Set Relationship RAID 6 1 (12+2, 12+2, 12+2) (3+2) RAID 10 2 (7+7, 7+7, 7+7) (2+2) RAID 50 2 (6+1 ,6+,1, 6+1, 6+1, 6+1, 6+1) (3+1) RAID 5 2 (12+1, 12+1, 12+1) (6+1) Best Practices Yes Yes For selected configurations Not for business-critical data Table 31. 84-Drive Configuration shows the RAID set relationship for each RAID type in a 84-drive configuration. Table 31. 84-Drive Configuration RAID Policy Spare Disks RAID Set Relationship RAID 6 2 (12+2) (12+2) (12+2) (12+2) (12+2) (10+2) RAID 6 Accelerated 1 HHD 1 SSD (12+2 HDD) (12+2 HDD) (12+2 HDD) (12+2 HDD) (10+2 HDD) (12+2 SSD) Best Practices Yes N/A RAID 10 2 RAID 50 2 RAID 5 2 (7+7) (7+7) (7+7) (7+7) (7+7) (6+6) (12+2) (12+2) (12+2) (12+2) (12+2) (10+2) (12+2) (12+2) (12+2) (12+2) (12+2) (10+2) Yes Not for business-critical data Not for business-critical data Enable and Disable a Volume RAID Preference A PS Series group uses automatic performance load balancing (enabled by default) to identify the RAID level that provides the best performance for a volume and store volume data on pool members with that RAID level, if such members are available. Prerequisites The following prerequisites and considerations apply: • RAID 5 does not offer optimal data protection for business-critical data due to the higher risks of encountering a second drive failure during a rebuild, and is therefore not recommended. You cannot configure RAID 5 using the Group Manager GUI; however, it can be configured using the CLI. • Thin clones inherit the RAID preference, if any, of the template volume. You cannot set a separate RAID preference for a thin clone. • You can override automatic performance load balancing by enabling a RAID level preference on a volume. • If you enable a RAID preference, the group attempts to store volume data on pool members with that RAID level. The group still uses capacity-based load balancing on the volume. 122 PS Series Group Operations