SYSTEMS level ENQ

Page data sets are protected with a SYSTEMS level ENQ that contains the name of the page data set and the volser it resides on. The qname used on the ENQ is SYSZILRD, and the rname used on the ENQ is the dsname + volser. This ENQ is obtained during master scheduler initialization for the IPL-specified page data sets. For example, the ENQ would be obtained from the definitions in the IEASYSxx parmlib member. The ENQ is also obtained whenever a page data set is added or replaced after IPL.

A warning-level message is issued if the ENQ cannot be obtained successfully during IPL for the IPL-specified page data sets. Processing for the command is terminated if the ENQ cannot be obtained for a page data set that is being added or replaced with the PAGEADD or PAGEDEL command.