When Scratch Pool Management is enabled, TLMS provides enforcement for both pool and nonpool nonspecific output requests. If a data set requires the use of a specific pool, but the volume mounted to satisfy the request is not part of the assigned range(s), TLMS demounts the volume and issues a NOT SCRATCH message. The request is reissued.
If the request is not for a specific pool, but a volume is mounted that is assigned to a specific pool, TLMS demounts the volume and issues the message. The request is reissued.
TLMS is not part of the allocation of which volume is being mounted. The IBM tape library manager determines what volser is being mounted for a scratch and not TLMS.
The volsers that are mounted for scratch are determined by ACS rules and the backend tape library manager.