Corrective action

Take an SVC dump of all systems in the sysplex. Include the OMVS address space and all OMVS data spaces in the dump. See Getting the right z/OS UNIX data in a dump to determine what DUMP parameters to use. To initiate the dump on all systems, use the REMOTE=(SYSLIST=(system1,system2,...),SDATA,DSPNAME) parameter. For more information on the DUMP system command, see z/OS MVS System Commands.
Note that FIX processing performed in the next step also initiates an SVC dump, but the dump includes different data, capturing critical global file system resources.

Retain all dumps in case you need to provide them to the IBM® Service Center for analysis.
If the MODIFY BPXOINIT, FILESYS=DISPLAY,GLOBAL output indicates a recommended action of FIX, issue the MODIFY BPXOINIT,FILESYS=FIX system command. In response, the system should issue message BPXF052I, indicating that the system has an inconsistent XCF representation. FIX starts z/OS UNIX System Services partition cleanup processing for the named system. This processing should clear the original delay condition.
If the MODIFY BPXOINIT, FILESYS=DISPLAY,GLOBAL output indicates that another serialized file system activity is in progress, use the time stamp in the output to determine if the serialized category of processing has been ongoing for a significant period of time. To determine if there is a problem, issue the MODIFY BPXOINIT, FILESYS=FIX system command, then follow the corrective procedures described in Scenario 4: Mount, unmount, or quiesce processing seems to be delayed.