A storage pool is the logical container for a collection of four or more system drives (SDs). There are two types of storage pools: untiered and tiered.
An untiered storage pool contains SDs created on one or more storage systems in the same storage tier. These storage systems must have comparable performance characteristics. To create an untiered storage pool, you must have at least four unused system drives on the storage system. These system drives will be used to create the pool.
A tiered storage pool is a combination of SDs from high-performance storage, such as flash memory, with lower-performance devices, such as Serial Attached SCSI (SAS) or Near Line SAS (NL SAS). It must include two tiers.
- Tier 0 is used for metadata, and the best-performing storage should be designated as Tier 0.
- Tier 1 is used for user data.
When creating a tiered storage pool, you must have at least four unused SDs available for each tier. First, create the user data tier (Tier 1), and then create the metadata tier (Tier 0).
Storage pools managed by Hitachi Disaster Recovery Solution
Storage pools that are managed by Hitachi Disaster Recovery Solution are indicated by HDRS Managed Storage Pool Yes and are read-only in the File Administrator GUI.