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Creating a Flash Pool aggregate using physical SSDs

You create a Flash Pool aggregate by enabling the feature on an existing aggregate composed of HDD RAID groups, and then adding one or more SSD RAID groups to that aggregate. This results in two sets of RAID groups for that aggregate: SSD RAID groups (the SSD cache) and HDD RAID groups.

Before you begin

About this task

After you add an SSD cache to an aggregate to create a Flash Pool aggregate, you cannot remove the SSD cache to convert the aggregate back to its original configuration.

By default, the RAID level of the SSD cache is the same as the RAID level of the HDD RAID groups. You can override this default selection by specifying the raidtype option when you add the first SSD RAID groups.

Steps

  1. Mark the aggregate as eligible to become a Flash Pool aggregate: storage aggregate modify -aggregate aggr_name -hybrid-enabled true
    If this step does not succeed, determine write-caching eligibility for the target aggregate.
  2. Add the SSDs to the aggregate by using the storage aggregate add command.
    You can specify the SSDs by ID or by using the diskcount and disktype parameters.

    If the HDDs and the SSDs do not have the same checksum type, or if the aggregate is a mixed-checksum aggregate, then you must use the checksumstyle parameter to specify the checksum type of the disks you are adding to the aggregate.

    You can specify a different RAID type for the SSD cache by using the raidtype parameter.

    If you want the cache RAID group size to be different from the default for the RAID type you are using, you should change it now, by using the -cache-raid-group-size parameter.