Plan for device parity protection

RAID 5

Systems with IOAs released after V5R2 hold a minimum number of 3 disk units in a parity set; the maximum number of disk units in a parity set is 18.

Note: Systems with IOAs released prior to V5R2 of OS/400^®, the minimum number of disk units in a parity set is 4. The maximum number of disk units in a parity set is 10.

RAID 6

The minimum number of disk units in a parity set is 4. The maximum number of disk units in a parity set is 18.

To learn more about how device parity protection is implemented, see How device parity protection works. Examples: Device parity and mirrored protection shows some examples of how device parity protection can be used in conjunction with mirrored protection.

Note: If your goal is to have a system with data loss protection and concurrent maintenance repair, a combination of mirrored protection and device parity protection is recommended.