When you create a pool, you select the pool volumes (pool-VOLs) for the pool and set options such as the warning and depletion thresholds for the pool. You can also enable options such as V-VOL protection and data deduplication.
A pool cannot be created from a DDP group by using REST API. To create a pool in a DDP configuration, use CCI.
Before the pool creation, verify the parity group ID of the parity group containing the pool to be created, the pool ID to be used, and the type of pool to be created.
Create a pool by specifying a parity group that contains no LDEVs. The LDEV creation, LDEV formatting, and pool-VOL addition are automatically performed. There is no need to create the LDEV in advance.
- Before you can create pools, the proper amount of shared memory must be installed, and you must have a V-VOL management area in shared memory. When shared memory is added, the V-VOL management area is automatically created. The shared memory must be added depending on the pool capacity to be created. For more information about the relationship between the shared memory expansion and the pool capacity, see Shared memory requirements.
- One pool-VOL with system area is defined for a pool. The priority of the pool-VOL with system area is assigned according to the drive type. The available capacity of the pool-VOL with system area is deducted from the management area capacity. The management area capacity stores the management information of program products software that uses the pool. If Dynamic Provisioning or Thin Image Advanced is used on an open system, 4.2 GB is used as the management area in the pool-VOL with system area.
- When a pool is created, a pool-VOL with system area is assigned the priority shown in the following table. If multiple pool-VOLs of the same drive type exist, the priority of each is determined by the internal index of the storage system.
Priority
Drive type
1 SSD 2 External volume
When you create or expand a pool by using VSP One Block Administrator, a parity group is automatically created.
The drive configuration for a parity group is determined by the number of drives specified, the RAID level, and the DDP settings. In the RAID 6 drive configuration, 14D+2P is preferred over 6D+2P.