Dynamic volume expansion
Dynamic volume expansion is the capability to increase provisioned capacity up to a maximum size while volumes are online to a host and not in a Copy Services relationship.
Dynamic volume expansion increases the capacity of open systems, IBM® i, and IBM Z volumes, while the volume remains connected to a host system. This capability simplifies data growth by providing volume expansion without taking volumes offline.
Some operating systems do not support a change in volume size. Therefore, a host action is required to detect the change after the provisioned capacity is increased.
The following volume sizes are the maximum that are
supported for each storage type.
- Open systems FB volumes: 16 TB
- IBM i variable size volumes
- IBM Z CKD volume types 3390 model 9 and custom: 65520 cylinders
- IBM Z CKD volume type 3390 model 3: 3339 cylinders
- IBM Z CKD volume types 3390 model A: 1,182,006 cylinders
Note: Volumes cannot be in Copy Services relationships (point-in-time
copy, FlashCopy® SE, Metro
Mirror, Global Mirror, Metro/Global Mirror, and z/OS® Global Mirror) during expansion.