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When a job goes into allocation recovery and an allocation recovery message is outstanding waiting for a reply (DEVICE NAME, WAIT, or CANCEL), the job holds device group locks for the devices that it can allocate. When an allocation recovery message is outstanding on the local system, tape allocations on external systems that require the same locks are delayed until the allocation recovery message is replied to. Jobs in allocation recovery on one system also delay any VARY ONLINE commands on external systems for devices for which the locks are held by the allocation recovery. The VARY ONLINE commands on the external systems are delayed until the local allocation recovery message is replied to. If allocation recovery messages are not replied to promptly, then cross-system delays in VARY ONLINE processing as well as in tape allocation processing can result.
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