Creating a Flash Pool aggregate using SSD storage pool allocation units
You can configure a Flash Pool aggregate by adding one or more allocation units from an SSD storage pool to an existing HDD aggregate.
Before you begin
You must have identified a valid aggregate composed of HDDs to convert to a Flash Pool aggregate.
You must have determined write-caching eligibility of the volumes associated with the aggregate, and completed any required steps to resolve eligibility issues.
You must have created an SSD storage pool to provide the SSD cache to this Flash Pool 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 must have determined how much cache you want to add to the 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.
You must have determined the RAID type you want to use for the SSD cache.
After you add a cache to the aggregate from SSD storage pools, you cannot change the RAID type of the cache RAID groups.
You must have determined the maximum cache size for your system and determined that adding SSD cache to your aggregate will not cause you to exceed it.
You can see the amount of cache that will be added to the total cache size by using the storage pool show command.
You must have familiarized yourself with the configuration requirements for Flash Pool aggregates.
About this task
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.