VARY ONLINE processing competes with tape device allocations, UNLOADs, and SWAPs for device group locks for CA MIA managed devices. These processes on the local system delay VARY ONLINE processing on external systems. For example, assume a job in tape device allocation on a local system holds the device group locks for a set of devices. VARY ONLINE commands issued on external systems for these devices must wait until device group locks are released. Similarly, a local VARY ONLINE delays external systems tape allocation until VARY processing finishes for the device.
The CA MIA DIAGNOSE command provides information about the device group lock usage for each system. Use this command to display information about delays in tape device allocation, SWAP, UNLOAD, and VARY ONLINE processing.
VARY ONLINE cross-system lock requests time out if they are not satisfied within the interval specified by SETOPTION VARYDELAY. The default VARY Delay timeout value is 30 seconds. When the timeout occurs, the request is re-queued, allowing the next VARY ONLINE request in the queue to enter cross-system lock processing.
|
Copyright © 2014 CA.
All rights reserved.
|
|