Dynamic device allocation allows you to allocate tape devices as they are needed.
There are three ways to allocate your tape devices.
- All tape devices needed for the save operation are allocated in the beginning.
- Only one tape device is allocated at the beginning of a save operation. The maximum number of devices are allocated when data is ready to be written.
- The number of devices specified for the minimum parallel device resources field is allocated at the beginning of a save operation. Additional devices are allocated when data is ready to be written.
Note: Use the Create Media
Definition API to specify your preferred value.
Dynamic tape allocation restrictions
- Initially all of the save operations will continue to allocate at least one device. Any operation that does not use a media definition will allocate its device at the beginning of the operation.
- Devices will not be dynamically deallocated.
- The dynamically allocated devices will be limited to these points in time
- After a save-while-active checkpoint.
- When the initial library data is ready to be written to an available device.
