To prevent multiple hosts from attempting to simultaneously process
logical volumes in the export category, a SYSTEMS level enqueue, similar
to cartridge entry processing, is used. The resource names are:
QNAME—SYSZCBR
RNAME—EXPORTED_CATEGORY_libname
It is possible to perform export processing without global resource
serialization. The following are the consequences of unserialized
processing:
- Export completion processing occurs simultaneously in all processors.
Each processor handles a subset of the exported volumes.
- Some additional processing overhead takes place, due to concurrent
processing of the same list of volumes.
- The cartridge eject installation exit is entered once for each
volume on each processor. The installation must account for this possibility
when writing the exit.
Recommendation: Use global resource serialization.