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

When you change an aggregate's RAID level from RAID-DP to RAID4, the extra parity disks are converted to spares. In addition, the raidsize option is changed.

Step

  1. Enter the following command:aggr options aggr_name raidtype raid4

Result

When you change the RAID level of an aggregate from RAID4 to RAID-DP, Data ONTAP makes the following changes:
  • In each of the aggregate’s existing RAID groups, the RAID-DP second parity disk (dParity) is removed and designated as a hot spare, thus reducing each RAID group’s size by one parity disk.
  • Data ONTAP changes the setting for the aggregate’s raidsize option to the size of the largest RAID group in the aggregate, except in the following situations:
    • If the aggregate’s largest RAID group is larger than the maximum RAID4 group size, then the aggregate’s raidsize option is set to the maximum.
    • If the aggregate’s largest RAID group is smaller than the default RAID4 group size, then the aggregate’s raidsize option is set to the default group size.
    • If the aggregate's raidsize option is already below the default value for RAID4, it is reduced by 1.

After you finish

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