The capacity of a disk array depends on the capacity of
the advanced function disks used and the RAID level of the array.
Before you begin
In order to estimate the capacity of a disk array, you must
know the capacity of the advanced function disks and the RAID level
of the array.
Procedure
- For RAID 0, multiply the number of disks by the disk capacity.
- For RAID 5, multiply one fewer than the number of disks
by the disk capacity.
- For RAID 6, multiply two fewer than the number of disks
by the disk capacity.
- For RAID 10, multiply the number of disks by the disk capacity
and divide by 2.
Note:
- If disks of different capacities are used in the same array, all
disks are treated as if they have the capacity of the smallest disk.
- SAS RAID controllers support up to 18 member disks in each RAID
array.
- For RAID 5T2, 6T2, and 10T2, each tier in the array follows the capacity rules for the
base RAID level of the tier. Note that each tier must contain at least 10% of the total disk
capacity. The disk capacity per tier is calculated by taking the smallest drive in each tier
multiplied by the total number of physical disks in that tier. Divide the disk capacity of each tier
by the total disk capacity. The result must be greater than 10%.