Administrator Guide

Table Of Contents
RAID Sets
The tables below show a logical drive layout when an array is initialized for the rst time. The actual physical layout of drives can
change and evolve due to maintenance and administrative actions. Spare drives can move as they are used to replace failed drives
and newly added drives become the spares.
NOTE: It is not possible to determine which physical drives are associated with each RAID set. This information is
dynamic and maintained by the Dell EqualLogic rmware.
Table 25. 12–Drive Conguration shows the RAID set relationship for each RAID type in a 12-drive conguration.
Table 25. 12–Drive Conguration
RAID Policy Spare Disks RAID Set Relationship Best Practices
RAID 6 1 (9+2) Yes
RAID 10 2 (5+5) Yes
RAID 50 2 (4+1, 4+1) For selected congurations
RAID 5 1 (10+1) Not for business-critical data
Table 26. 14–Drive Conguration shows the RAID set relationship for each RAID type in a 14-drive conguration.
Table 26. 14–Drive Conguration
RAID Policy Spare Disks RAID Set Relationship Best Practices
RAID 6 1 (11+2) Yes
RAID 6
Accelerated
1 HDD (6+2 HDD) (6+2 SSD) N/A
RAID 10 2 (6+6) Yes
RAID 50 2 (5+1)(5+1) For selected congurations
RAID 5 1 (12+1) Not for business-critical data
Table 27. 16-Drive Conguration shows the RAID set relationship for each RAID type in a 16-drive conguration.
Table 27. 16-Drive
Conguration
RAID Policy Spare Disks RAID Set Relationship Best Practices
RAID 6 1 (13+2) Yes
RAID 10 2 (7+7) Yes
RAID 50 2 (6+1, 6+1 ) For selected congurations
RAID 5 1 (14+1) Not for business-critical data
Table 28. 24-Drive Conguration shows the RAID set relationship for each RAID type in a 24-drive conguration.
Table 28. 24-Drive
Conguration
RAID Policy Spare Disks RAID Set Relationship Best Practices
RAID 6 1 (10+2) (9+2) Yes
RAID 10 2 (6+6) (5+5) Yes
RAID 50 2 (5+1, 5+1) (4+1, 4+1) For selected congurations
RAID 5 1 (12+1) (9+1) Not for business-critical data
PS Series Group Operations
121