At the beginning of automatic primary space management, DFSMShsm determines which volumes are candidates for processing. Volumes in storage groups that have a z/OS® image specified by the MIGRATE SYSTEM/SYSPLEX NAME have a z/OS image affinity.
DFSMShsm uses the following order of processing as a method of controlling input path contention. This order is subject to prioritizing for SMS volumes restricted to processing by one z/OS image.
After DFSMShsm has attempted to process all the candidate volumes eligible for automatic primary space management, it retries the selection of any of these volumes that were found to be in use by another DFSMShsm function.
If multiple DFSMShsm hosts perform automatic primary space management, only the first host to process a given volume performs the function.