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

Before you change an aggregate’s RAID protection from RAID4 to RAID-DP, you need to ensure that enough appropriate hot spare disks are available.

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 disk pool; assigns the new disk the dParity disk function for the RAID-DP 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.

Parent topic: Changing the RAID level of an aggregate

Related concepts

How aggregates work

Related reference

Maximum and default RAID group sizes