Previous topic |
Next topic |
Contents |
Contact z/OS |
Library |
PDF
Preventing deadlocks during volume dumps z/OS DFSMShsm Implementation and Customization Guide SC23-6869-01 |
|
DUMP processing holds the VTOC resource while dumping a volume. Whenever DUMP processing reaches the EOV, it must get the TIOT resource in order to access a new tape. However if a request is issued to allocate a data set on the DASD being dumped, the request holds the TIOT resource and requests the VTOC resource instead. This inverse ordering of resource acquisition can result in a function deadlock. To activate the early VTOC release functional change, put the following
PATCH command into your DFSMShsm startup procedure:
You can also activate early VTOC release by invoking the ADRUENQ installation exit. See z/OS DFSMS Installation Exits for more information on the ADRUENQ installation exit. |
Copyright IBM Corporation 1990, 2014
|