The best time to start device parity protection is when you add new or nonconfigured disk units. The Add a disk unit or disk pool has steps for including disk units in a parity set and starting device parity protection. It is also possible to start device parity protection at a later time.
RAID 5 parity set
- 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: For systems with IOAs released after OS/400® V5R2, the minimum number of disk units in a parity set is 4. The maximum number of disk units in a parity set is 10.
- All devices in a parity set must be the same capacity.
RAID 6 parity set
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.
Start device parity protection
- In iSeries™ Navigator, expand Disk Units.
- Select the disk units for which you want to start device parity protection.
- Right-click a selected disk unit and select Start Parity.
Select the level of RAID protection you want.
- From the resulting window, click Start Parity to start device parity protection on the displayed disk units.