Steps for partial shutdowns for JES2 maintenance

Before you begin: You need to notify users that the system is being shut down and ask them to log off. If you do not shut down and quiesce the UNIX workload, these critical system functions might be ended abnormally during the shutdown, which might cause several failures on the system. As a result, the system might not be shut down successfully.

Use the operator SEND command to send a note to all TSO/E users telling them that the system will be shut down. For example:
```
send 'The system is being shut down in five minutes. Please log off.'
```
Use the wall command to send a similar note to all shell users that are logged on. For example:
```
wall The system is being shut down in five minutes.  Please log off.
```

Perform the following steps to accomplish a partial shutdown.

Shut down z/OS UNIX.
```
F BPXOINIT,SHUTDOWN=FORKS
```
Result: You have ended all forked and non-local spawned address spaces on the system. If the operator receives a success message, the shutdown can be continued.
failure message means that some forked processes or non-local spawned address spaces could not be ended. To find these processes, issue:
```
D OMVS,A=ALL
```
To terminate them, issue:
```
F BPXOINIT,FORCE,FORCE=xxxxxxxx
```
If that does not work, use the CANCEL or FORCE operator commands.

_______________________________________________________________
Stop the file system colonies that were started under JES (those without SUB=MSTR specified when they were defined). Use normal shutdown procedures to close all file system address spaces such as Network File System Client (NFSC).
For NFSC use the F OMVS,STOPPFS=NFS command to bring down NFSC.

For all other colonies, use the procedures documented in their publications.

_______________________________________________________________

When you are done, you have partially shut down z/OS UNIX. New fork and spawn activity cannot be done; however, it is still possible for batch jobs and TSO users to use z/OS UNIX services. Now you can do whatever corrective or maintenance actions that were needed for JES2, such as restarting it.

Tip: To restart z/OS UNIX:

Issue the MODIFY (F) command.
```
F BPXOINIT,RESTART=FORKS
```
Restart the file system address spaces.
For NFSC, respond to the operator message BPXF032D issued when you previously stopped NFSC using F OMVS,STOPPFS=NFS command. Then reissue all the mounts if required.

For DFSCM, respond to the operator message BPXF032D.

For all other colonies, use the procedures that were documented in their product publications.