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Changing the RAID type of RAID groups in a Flash Pool aggregate

The SSD cache of a Flash Pool aggregate can have a different RAID type than the HDD RAID groups if you need to reduce the parity overhead for your SSD RAID groups.

Before you begin

About this task

You can change the RAID type of the SSD cache for a Flash Pool aggregate using SSD storage pools only when you add the first storage pool allocation units to the aggregate.

If the SSD cache has a different RAID type than the HDD RAID groups, the Flash Pool aggregate is considered to have a mixed RAID type, displayed as mixed_raid_type for the aggregate. In this case, the RAID type is also displayed for each RAID group.

All HDD RAID groups in a Flash Pool aggregate must have the same RAID type, which should be RAID-DP.

Steps

  1. Change the RAID type of the SSD cache or HDD RAID groups of the Flash Pool aggregate: storage aggregate modify -aggregate aggr_name -raidtype raid_type -disktype disk_type
    To change the RAID type of the SSD cache, use -disktype SSD. To change the RAID type of the HDD RAID groups, specify any disk type included in the HDD RAID groups.
  2. Verify the RAID groups in your Flash Pool aggregate: storage aggregate show -aggregate aggr_name
    You also can use the storage aggregate show-status command to obtain more details about the RAID types of the HDD RAID groups and SSD cache of the Flash Pool aggregate.

Example

In this example, the HDD RAID groups and SSD cache of a Flash Pool aggregate using physical SSDs named "test" initially have a RAID type of RAID-DP. The following command changes the RAID type of the SSD cache to RAID4, and converts the Flash Pool aggregate to the mixed RAID type: storage aggregate modify -aggregate test -raidtype raid4 -disktype SSD

The output from the storage aggregate show-status command shows that the aggregate has a mixed RAID type, the HDD RAID groups have a RAID type of RAID-DP, and the SSD cache has a RAID type of RAID4.

storage aggregate show-status test

Aggregate test (online, mixed_raid_type, hybrid) (block checksums)
  Plex /test/plex0 (online, normal, active, pool0)
    RAID Group /test/plex0/rg0 (normal, block checksums, raid-dp)
                                                              Usable Physical
     Position Disk                        Pool Type     RPM     Size     Size Status
     -------- --------------------------- ---- ----- ------ -------- -------- ----------
     dparity  1.2.3                        0   BSAS    7200  827.7GB  828.0GB (normal)
     parity   1.2.4                        0   BSAS    7200  827.7GB  828.0GB (normal)
     data     1.2.5                        0   BSAS    7200  827.7GB  828.0GB (normal)
     data     1.2.6                        0   BSAS    7200  827.7GB  828.0GB (normal)
     data     1.2.8                        0   BSAS    7200  827.7GB  828.0GB (normal)



    RAID Group /test/plex0/rg1 (normal, block checksums, raid4)
                                                              Usable Physical
     Position Disk                        Pool Type     RPM     Size     Size Status
     -------- --------------------------- ---- ----- ------ -------- -------- ----------
     parity   1.3.3                        0   SSD        -  82.59GB  82.81GB (normal)
     data     1.4.0                        0   SSD        -  82.59GB  82.81GB (normal)
     data     1.4.1                        0   SSD        -  82.59GB  82.81GB (normal)
     data     1.4.2                        0   SSD        -  82.59GB  82.81GB (normal)