The exempt list affects only GDIF; it affects neither EDIF nor ECMF. The exempt list is ignored if every statement of the QNAME list specifies EXEMPT=NO. In this case, the QNAME list provides all the information that controls GDIF. The exempt list is not required to be identical on every system; however, system management is easier if every system has the same exempt list.
The exempt list provides supplemental processing instruction for GDIF. If you want to use the exempt list to give GDIF supplemental and more specific information about processing a QNAME, then you need to specify EXEMPT=YES on that QNAME statement. Doing this allows you to use RNAMEs and job names to determine whether an ENQ request should be propagated. You also can change the way GDIF handles hardware reserves, based on the QNAME and RNAME on the RESERVE request.
You can use the exempt list to give GDIF special processing instructions, based on the RNAME of a resource or on the name of the job that issued the ENQ request. If you want to use other criteria (such as device name, volume serial number) to give GDIF special processing instructions, you can code the optional GDIXMPXT exit routine.
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