Modifying data class definitions

You might need to define or modify data classes for objects stored in Object and Object Backup storage groups to use new tape devices, for example.

Data class definitions might be changed to accomplish the following functions:

Specify a media type for a tape device.
Specify a recording technology for a tape device.
Specify performance scaling or performance segmentation for a tape device.

Recommendation for 3592 Model J1A tape devices: If you are not using the performance scaling option, run in 3590-1 emulation mode to use the tape volumes effectively because OAM uses the full capacity of the volume. If you run in 3490E emulation mode, OAM might run out of tape blockids before it uses the full capacity of the volume, depending on the capacity value and the size of the objects being written.