Brice and Murray thanks for the suggestions!
IBM (Informix)does not consider ISM installation problems part of the
core product so no free tech support there.
However I had much joy at the Legato Tech Dialog site
where I discovered a bug
Title: AIX/NetWorker 5.5 - Core dump running nsrexecd; Set nofiles to
Attempting to start NetWorker daemons on an AIX client fails with a
NetWorker server for NT 5.5.1
NetWorker client for AIX 5.5.1
Windows NT 4.0
After installing an AIX 4.3.1 patch, starting the NetWorker daemons
fails with a
core dump. There are no other error messages.
Checked the client index with nsrck -F, and they appear to be okay.
Checked the system parameter set up. The soft file descriptor is set
which means no limit. This setting is causing NetWorker to core dump.
Change the nofiles parameter back to the default of 2000.
1) Edit /etc/security/limit
2) Modify the nofiles parameter
3) Restart the NetWorker daemons
__ End of Legato
The file is actually /etc/security/limits
and even though the text says aix client it also manifests itself in
an AIX server environment.