A former co-worker had a problem last week during a scheduled maintenance
window and the analysis afterward led a consultant to say this in his root
cause analysis report:
"Anytime you are doing any kind of disk work on a system you always want
to power the system down controlled. Ending the system "controlled"
flushes the disk cache from memory to disk, "immediate" does not do this.
I cringe when I see customers using *IMMED. 99% of the time the system
will come back up without issue, but that other 1% results in the type of
issue reported here. They took the time to end all of the subsystems to a
restricted state before issuing the PWRDWNSYS, which is the right thing to
do, but then powered down immediately. It's a common misconception that
ending the system controlled takes significantly longer to end. Once the
system is in a restricted state, it takes only seconds longer to end the
system "controlled" versus "immediate". The trick to using *CNTRLD is to
make sure you change the delay time to something like 5 (for 5 seconds)
rather than the default of 3600, otherwise you'll be waiting an hour before
the system starts powering down."
I have to say in 27 years of administering the platform in all its flavors
I've never done a PWRDWNSYS *CNTRLD and I have yet to have any problems
caused by that. Thoughts anyone??
Paul Fenstermacher | Sys/NW Admin,Sr | Corporate Systems - POWER Systems
Administration | Jack Henry & Associates, Inc.(r)
663 West Highway 60 | Monett, MO 65708 | Ph. 417.235.6652 | x177389 |
NOTICE: This electronic mail message and any files transmitted with it are
exclusively for the individual or entity to which it is addressed. The
together with any attachment, may contain confidential and/or privileged
Any unauthorized review, use, printing, saving, copying, disclosure or
is strictly prohibited. If you have received this message in error, please
immediately advise the sender by reply email and delete all copies.
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
This mailing list archive is Copyright 1997-2013 by MIDRANGE dot COM and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available here. If you have questions about this, please contact