A few notes on how z/OS determines the logical Parmlib concatenation:
MSTRJCL=nn
Where nn identifies the suffix of the MSTJCLxx member to be used.
In either case, both are limited by DF/SMS to a maximum of 120 DASD extents which can be allocated to a concatenated PDS. It is important to monitor the number of DASD extents for critical system data sets.
Exceeding these limits will cause the IPL to fail, so it’s important to monitor the number of DASD extents for critical system data sets. The data sets will be discarded in error when a LOADxx member is used at IPL time. When used after IPL through the SETLOAD command, the SETLOAD command will fail in this instance.
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