You may decide to restart the SMSPDSE1 address space to try to correct system problems due to a problem in PDSE processing. Before doing so, however, you should be aware this action could result in failures of currently running jobs and TSO sessions that are accessing PDSEs. In addition, you should note the following restrictions and limitations:

1. The SMSPDSE1 address space restart might not work correctly if more than one SMSPDSE1 address space restart is attempted concurrently because of the xQUIESCE time interval that is initiated by the restarting SMSPDSE1. If a SMSPDSE1 restart is performed on more than one system at the same time, then these restarting systems will not get the benefit of the other systems' xQUIESCE time duration interval.
2. If the SMSPDSE1 address space terminates as a result of a hard failure or because of the FORCE command, then the results of a PDSE address space restart are unpredictable. Some undesirable effects that could result from a FORCE command are:
   • If a member is deleted while SMSPDSE1 is down, then a reconnection to that member will fail.
   • If a user on another system opens for update when the restartable connection had a data set open for read/write, the restart connection will fail.
3. If the user address space fails to reconnect after the SMSPDSE1 address space restarts, then the user address space should be forced off of the system.
4. The restart of the SMSPDSE1 address space could result either in a loss of some SMF I/O counts or in duplicate counts.
5. If you used the VARY SMS,PDSE1,MONITOR command to change the PDSE MONITOR values and the SMSPDSE1 address space is restarted, then the values provided either by system defaults or by the MONITOR values specified in the IGDSMSxx member of SYS1.PARMLIB will be used to restart the PDSE1 MONITOR.
6. If callers that do not use the standard PDSE interface are connected, then PDSE will not know that the connection is active (and not behaving as expected). At this time there are no known callers of PDSE that fit this criteria.