Typically, a storage volume can be used for both backup and restore operations. Occasionally, you might decide that a particular storage volume should not receive any more new data. In this case, you can change the Backup status to Disabled, which prevents ISM from using the storage volume during a backup operation. ISM uses this storage volume only for restore operations until you change the volume status.
If a storage volume fills with data during a backup operation, the ISM server automatically changes the Backup status to Disabled. This action ensures that the ISM server does not try to use the volume for subsequent backup operations. Whenever a storage volume gets full, ISM sets the Backup status to Disabled until that volume is recycled. For the procedure, see Enabling and Disabling a Storage Device.