To delete the global resource serialization lock structure (ISGLOCK), a sysplex-wide IPL is needed to convert to a global resource serialization ring complex. After all systems are reset, re-IPL them with GRS=TRYJOIN. See z/OS MVS Planning: Global Resource Serialization for more information.

Note that when performing a sysplex-wide IPL for CF maintenance or reconfiguration, ISGLOCK does not need to be deleted, but the CFRM active policy used at IPL must specify a usable CF for ISGLOCK in order to participate in a global resource serialization star complex.