Figure 11 FAST components
Service Levels
*
*
*
* Not supported on storage groups containing CKD volumes.
FAST allocation by storage resource pool
FAST manages the allocation of new data within the Storage Resource Pool by
automatically selecting a Storage Resource Pool based on available disk technology,
capacity and RAID type.
If a storage group has a Service Level (SL), FAST automatically changes the ranking
of the Storage Resource Pools used for initial allocation. If the preferred drive
technology is not available, allocation reverts to the default behavior and uses any
available Storage Resource Pool for allocation.
FAST enforces SL compliance within the Storage Resource Pool by restricting the
available technology allocations. For example, the Platinum SL cannot have allocations
on 7K RPM disks within the Storage Resource Pool. This allows FAST to be more
reactive to SL changes and ensure critical workloads are isolated from lower
performance disks.
Storage Tiering
FAST allocation by storage resource pool 87
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