If allocation is active, SVC dump data sets can be automatically
allocated as soon as resources are defined to store them. If you have
not changed the name pattern, then the system default is used. See Establishing a name pattern. You can define dump data set resources using the
DUMPDS ADD,VOL=volser (for DASD volumes) and DUMPDS ADD,SMS=class
(for SMS classes) commands. You can remove resources using the DUMPDS
DEL,VOL=volser and DUMPDS DEL,SMS=class commands. Automatic allocation
is directed to SMS classes in preference to DASD volumes.
When automatic allocation is inactive, dumps are written to pre-allocated
SYS1.DUMPxx data sets. Deactivating automatic allocation does not
result in the loss of resource definitions, however. So, if automatic
allocation is reactivated, all the previous resources remain available
for receiving automatically allocated dump data sets. Similarly, removing
the last allocation resource will not cause automatic allocation to
be inactive. Removing the last allocation resource
effectively ‘turns
off’ the function, though, just as if all the defined resources
were full. In both cases the system responds with message IEA799I
and dumps are written to pre-allocated SYS1.DUMPxx data sets if they
exist. Otherwise the dump remains captured until:
- You create a place for it
- The established time limit, as indicated by the CHNGDUMP MSGTIME
parameter, expires
- The operator deletes the dump.