Storage pools and volumes

Typically, you assign volumes to storage pools based on their common characteristics, such as device capabilities (availability or performance level) and usage (business division, project, application, location, or customer).

Each storage pool manages its own volumes. File space is allocated to the volumes in a given storage pool in a round-robin algorithm (as shown in Figure 1) in logical partitions, or in blocks. Logical partitions are allocated to the system storage pool in 16-MB blocks. For user storage pools, including the default storage pool, you can allocate logical partitions in 16, 64, or 256-MB blocks. All logical partitions in the same storage pool must be the same size.

Figure 1. File space allocation
This figure illustrates how data is allocated to volumes in a storage pool.
Tip: You can set a threshold to generate an alert when a storage pool reaches or exceeds a certain percentage of its maximum capacity. By default, an alert is generated when a storage pool becomes 80% full. An alert is logged every five minutes until one or more volumes are assigned to the storage pool. You can set configuration parameters to cause an SNMP trap message to be generated as well. An SNMP trap notifies you of this condition asynchronously.

Parent topic: Storage pools

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