I have to agree with Jeff. The hung user situations that we have had are not unsolved because of the lack of trying to diagnose them by IBM and other vendors. The nature of the beast is that the culprit has vanished into the night before anyone notices that there is a problem. It is the classic case of it being so long after the actual occurrence of the problem that all clues have been obliterated. Both IBM and VSSI (the vendor of VPARS, the program product that might possibly cause our hangs) have pored over several dumps and found nothing more than what I could find. The dumps were taken too far after the actual hanging of the user. To be sure, it is difficult to imagine being able to take the dump at the best moment for determining what went wrong. For example, a check to insure that the count goes to zero when the last item of deferred work completes may, probably will, be too late. It may have been an earlier task that failed to decrement the count. This is a problem that can only be detected long after it has happened. It is much more difficult to catch a problem when something doesn't happen than it is to catch it at the time it happens.
-----Original Message----- From: VM/ESA and z/VM Discussions [mailto:[EMAIL PROTECTED] On Behalf Of Jeff Gribbin, EDS Sent: Tuesday, December 20, 2005 12:12 AM To: [email protected] Subject: Re: forcing a user Hello Thomas, I have to disagree with your comment about IBM VM Development's attitude to HUNGUSER situations. In my experience IBM has been obsessive about eliminating all possible HUNGUSER situations and will ALWAYS follow up any documented HUNGUSER reports. In my view VM Development is fully aware of the impact of a VM IPL - and this awareness has been a significant contributor to VM's intrinsic reliability - VM reliability has never been compromised merely for the sake of function - sometimes to the frustration of those eagerly awaiting that function - but, in my view, the only realistic strategy if there's to be a future. I guess you're right - it was a bad weekend. Regards Jeff Gribbin (Speaking for myself)
