We have one of these - it's been hung for about a month. I created a
new userid to take over from the one that's hung. There's no way I'm
going to IPL VM to resolve this.
As far as I can tell it occurred because of a tape error during an
SPXTAPE, and the operator forced the userid before SPXTAPE had been
canceled. In experimenting I have found that SPXTAPE will eventually
cancel himself when there's a tape error. I'm not sure that the
operator forced it before this happened - there's no way to know -
but in talking with the operator I think that's what happened.
The interesting thing about the tape error is this: we were doing an
SPXTAPE on a 3490E drive using an old 3480 tape that had never been
written to on a 3490E drive. Ordinarily this isn't a problem because
the fact that the tape is an 18 track tape is detected and it's
reinitialized as a 36 track tape, but apparently this does not happen
when you use SPXTAPE. (The condition is easily re-creatable.) I got
around this by inserting a DITTO INT command into the exec before the
SPXTAPE. I suspect it would be easy to create another hung userid,
but I didn't want to go that far! (Actually, I'm about to bring VM
up second level, so I suppose I could do it there.)
We're z/VM 4.2, so IBM wouldn't be interested in pursuing the
problem. But maybe from this description they can examine the code to
fix it for later releases.
The IMMED option doesn't do a thing. The tape error was fixed long
ago, and it's not possible to reattach the drive to the hung userid
to complete the I/O. HALTIO doesn't do a thing either.
- Tom.
At 12:01 PM 6/2/2006, you wrote:
After 40 years of developement and millions of lines of code why
this will still cause a VM IPL.
HCPCQU361E LOGOFF/FORCE pending for user VSEABCD
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Tom Cluster
County of Sonoma
Santa Rosa, CA
(707) 565-3384 (Tuesdays and Wednesdays only)
