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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

  1. 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
  2. List the available hot spares on your system by entering the following command:aggr status -s
  3. 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.
  4. Enter the following command:aggr options aggr_name raidtype raid_dp

Result

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-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.

After you finish

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