PeopleSoft: Fixing "msgget: No space left on device" Error on Solaris 10 ~ Creation Zone

When high number of application server processes are configured in a single PeopleSoft domain or in multiple domains cumulative, it is very likely that the PeopleSoft server domain boot process may fail with errors like:

Booting server processes ...
exec PSSAMSRV -A -- -C psappsrv.cfg -D CS90SPV -S PSSAMSRV :
        Failed.
113954.ben15!PSSAMSRV.29746.1.0: LIBTUX_CAT:681: ERROR: Failure to create message queue
113954.ben15!PSSAMSRV.29746.1.0: LIBTUX_CAT:248: ERROR: System init function failed, Uunixerr = : 
                   msgget: No space left on device
113954.ben15!tmboot.29708.1.-2: CMDTUX_CAT:825: ERROR: Process PSSAMSRV at ben15 failed with /T 
                   tperrno (TPEOS - operating system error)

In this particular example, the PeopleSoft Enterprise is running on a Solaris 10 system. Fortunately the error message is very clear in this case; and the failure is related to the message queues. During the domain boot up process, there is a call to msgget() to create a message queue. If the call to msgget() succeeds, it returns a non-negative integer that serves as the identifier for the newly created message queue. However in case of a failure, it returns -1 and sets the error number to EACCES, EEXIST, ENOENT or ENOSPC depending on the underlying reason.

From the above error messages it clear that the msgget() failed with the errno set to ENOSPC (No space left on device). Man page of msgget(2) has the following explanation for ENOSPC error code on Solaris:

ERRORS
     The msgget() function will fail if:
     ...
     ...
     ENOSPC    A message queue identifier is to  be  created  but
               the  system-imposed limit on the maximum number of
               allowed  message  queue  identifiers  system  wide
               would be exceeded. See NOTES.

NOTES
     ...
     ...

     The system-imposed limit on  the  number  of  message  queue
     identifiers  is  maintained on a per-project basis using the
     project.max-msg-ids resource control.

Good stuff. It has enough clues to suspect the configured number for the message queue identifiers.

Prior to the release of Solaris 10, the /etc/system System V IPC tunable, msgsys:msginfo_msgmni, could be configured to control the maximum number of message queues that can be created. The default value on pre-Solaris 10 systems is 50.

With the release of Solaris 10, majority of the System V IPC tunables were obsoleted and equivalent resource controls were created for the remaining tunables, to reduce the administrative overhead. On Solaris 10 and later versions, System V IPC can be tuned on a per project basis using the newly introduced resource controls.

On Solaris 10, The resource control, project.max-msg-ids, replaced the old /etc/system tunable, msginfo_msgmni. And the default value has been raised to 128.

Now back to the failure in PeopleSoft environment. Let's first check the current value configured for project.max-msg-ids.

Get the project ID.

 % id -p
uid=222227(psft) gid=2294(dba) projid=3(default)

Examine the project.max-msg-ids resource control for the project with ID 3, using the prctl utility.

 % prctl -n project.max-msg-ids -i project 3
project: 3: default
NAME    PRIVILEGE       VALUE    FLAG   ACTION                       RECIPIENT
project.max-msg-ids
        privileged        128       -   deny                                 -
        system          16.8M     max   deny                                 -

Alternatively run the command ipcs -q to check the number of active message queues. Note that the project with id '3' is configured to create a maximum of 128 (default) message queues. In any case, the number of active message queues from the ipcs -q output may almost match with the configured value for the project.max-msg-ids.

Since it appears the configured PeopleSoft domain(s) needs more than 128 message queues in order to bring up all the application server processes that constitute the PeopleSoft Enterprise, the solution is to increase the value for the resource control, project.max-msg-ids, to any value beyond 128. For the sake of simplicity, let's increase it to 256 (2 * default value, that is). Again prctl utility can be used to set the new value for the resource control.

Login as the 'root' user
```
 % su
Password:
```
Increase the maximum value for the message queue identifiers to 256 using the prctl utility.
```
 # prctl -n project.max-msg-ids -r -v 256 -i project 3
```

Verify the new maximum value for the message queue identifiers

 # prctl -n project.max-msg-ids -i project 3
project: 3: default
NAME    PRIVILEGE       VALUE    FLAG   ACTION                       RECIPIENT
project.max-msg-ids
        privileged        256       -   deny                                 -
        system          16.8M     max   deny                                 -

That's all there is. With the above change, the PeopleSoft Enterprise should boot up at least with no Failure to create message queue .. msgget: No space left on device errors.

Before we conclude, note that the above mentioned solution is not persistent across multiple operating system reboots. To make it persistent, create a new project with projadd command. The man page for projadd(1M) has an example showing the creation of a project.
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