Changing an aggregate's RAID level from RAID4 to RAID-DP

You can change an existing aggregate's RAID level from RAID4 to RAID-DP if you want the increased protection that RAID-DP provides.

Steps

Determine the number of RAID groups and the size of their parity disks in the aggregate in question by entering the following command: aggr status aggr_name -r
List the available hot spares on your system by entering the following command: aggr status -s
Make sure that at least one, and preferably two hot spare disks exist for each RAID group listed. If necessary, add additional hot spare disks.
Enter the following command: aggr options aggr_name raidtype raid_dp

When you change the RAID level of an aggregate from RAID4 to RAID-DP, Data ONTAP makes the following changes:

Adds an additional disk to each existing RAID group from the storage system’s hot spare disks; assigns the new disk the dParity disk function for the RAID group. A reconstruction begins for each RAID group to populate the dParity disk.
Changes the raidsize option for the aggregate to the appropriate RAID-DP default value.
Note: You can change the raidsize option after the RAID level change is complete.

You can verify the new RAID level by using the aggr options command.