Re: Customer box periodically becoming completely unresponsive -- we can't figure out why

Anything on the 'Front Panel' such as A6xx0255 ? This smells of hardware
that's coming and going.

Alternatively is it possible that severe disk I/O is swamping something? I
was moving 220GB of large files to a 520 yesterday with FTP over GbE to a 6
drive RAID set and at times the partition would appear hung for 30 or more
seconds, including Telnet.


- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 10/2/2014 12:04 PM, James H. H. Lampert wrote:

We have a customer whose Midrange box (a 525 running V7R1, with 4 LPARs,

55% system ASP used) has, recently, started becoming completely
unresponsive. Even their Telnet is unresponsive. This particular time,
it happened while I had a Telnet connection.

We have an ILE-based server program, primarily using native record-level
access, with some SQL done through CLI, and we have a web server that
runs as a Tomcat context, which is a client to both our ILE-based server
program and (via JDBC) to the SQL server. On this system, both our
proprietary server and the Tomcat server run in their own subsystem.

The system was rather quiet at the time it became unresponsive. There
are no QSYSOPR messages going back before the system was abended and
re-IPL'd, and the only history log entries I see from the approximate
time when the system became unresponsive were perfectly routine ones,
and one message -- after the system became unresponsive -- that was a
CPF0A9B, "Probe failed for category QHTTP."

I've been given one lead that I'm about to follow up on, namely a
potential SQL problem (even though I see nothing in any QZDASOINIT
joblogs), but does anybody else have any ideas of what could be causing
this?

--
JHHL

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