On 2014-11-25 13:47, Phil Smith wrote:
Like many companies, we use a z/OS guest at IBM Dallas for our testing. We also
cross-compile our source on Windows, using the Dignus compiler. Obviously, this
results in lots of FTPing bits from our systems to Dallas. Moreover, we do tons
of automated testing submitting jobs and gathering output directly to and from
the JES queue with FILETYPE=JES.
Usually this all works fine. Some days, however, are a disaster, with FTP hanging
constantly, both during "traditional" file transfers and when communicating
with the SPOOL via FILETYPE=JES.
We've been unable to identify any commonality to the bad days. At various times
we've suspected shortage of SPOOL space; something latent in not having IPLed
recently (we do wind up IPLing fairly frequently, due to running out of
reusable address spaces after stopping and restarting our cross-memory STC
repeatedly); shortage of initiators; and other things along those lines, but
have always been able to disprove those theories.
For example, today, with only two of us around (and thus even more control than
usual), is a bad day: test jobs keep hanging in FTP. We reIPLed, and SPOOL and
initiators are fine, but the hangs continue.
We've talked with IBM and our own IT, and nobody seems to have any clue about
how to diagnose this.
Any ideas? It's not only frustrating, but when we're on a release deathmarch,
is particularly disruptive to schedules!
Thanks in advance,
...phsiii
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We had a problem with FTP to IBM Dallas about four years ago. It didn't
hang, but we were only getting about 26 Kb/sec. They changed the MTU
size for the connection from defaultsize to 1492, and things got much
better. Just a thought, in case your hang isn't really quite a hang.
--
Regards, Gord Tomlin
Action Software International
(a division of Mazda Computer Corporation)
Tel: (905) 470-7113, Fax: (905) 470-6507
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