IPLing a system that shares DASD

Shared DASD can also affect how an operator IPLs a system that requires devices in use by other systems. An operator might have to re-IPL a system that is sharing DASD. If a device is being used by another system, the initializing system waits and then issues the following message to the operator:

* id IOS120A DEVICE ddd SHARED. REPLY 'CONT' or 'WAIT'

The operators should reply with “WAIT”.

“WAIT” causes the system to wait until the reserved device is released. If the system waits more than one minute, the operator should re-IPL.

If the device is still reserved, the system reissues message IOS120A. The operator should then reply with “CONT” and the path to the device is marked offline to the system. Thus, the device is also unavailable to jobs running on the system.