You create a Flash Pool aggregate with SSD storage pools by enabling the feature on an existing aggregate composed of HDD RAID groups, and then adding one or more SSD storage pool allocation units to that aggregate.
Any allocation unit from the storage pool that you want to use must be owned by the same node that owns the Flash Pool aggregate.
You add cache to the aggregate by allocation units. You can increase the size of the allocation units later by adding SSDs to the storage pool if there is room.
After you add a cache to the aggregate from SSD storage pools, you cannot change the RAID type of the cache RAID groups.
You can see the amount of cache that will be added to the total cache size by using the storage pool show command.
If you want the RAID type of the cache to different from that of the HDD RAID groups, you must specify the cache RAID type when you add the SSD capacity. After you add the SSD capacity to the aggregate, you can no longer change the RAID type of the cache.
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.
If you want the RAID type of the cache to be different from that of the HDD RAID groups, you must change it when you enter this command by using the raidtype parameter.
You do not need to specify a new RAID group; Data ONTAP automatically puts the SSD cache into separate RAID groups from the HDD RAID groups.
You cannot set the RAID group size of the cache; it is determined by the number of SSDs in the storage pool.