On 5/12/2017 5:18 PM, Jesse 1 Robinson wrote:
It's Friday, so I can (re)tell my war story. Shortly after z/OS R13 hit our
first prod system, I noticed one morning that the system had been IPLed around
05:00. Everyone denied having done it. Then I discovered a fresh SAD taken
around the same time. Sent if off to IBM. Next day or two, the same thing
happened. The system was wait-stating after running clean out of storage
frames! It made no sense. I posted the problem here.
Jim Mulder saw the thread and rang me up with a few questions. The failing
system, unlike the sandbox, was being mirrored to the DR data center. All of
it. Every single volume. Jim suspected and then confirmed that because of a
change in R13, a failing page-in caused an I/O redrive, which lost track of the
failing page request, which never got put back on the queue. With XRC active,
some percentage of page-ins got tangled up with SDM I/O. More lost frames.
Eventually MVS ran completely out of frames, and the system wait-stated. Auto
SAD. Auto IPL. It was Development, so at 05:00, there were no user calls. Ops
never noticed.
Jim fixed the problem immediately. I believe in auto IPL.
.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
323-715-0595 Mobile
626-543-6132 Office ⇐=== NEW
robin...@sce.com
Just don't forget to set MVS(LAST). The res volume you save may be your
own.
Regards,
Tom Conley
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