ADSM-L

Strange problem with client hanging

1998-08-12 15:27:27
Subject: Strange problem with client hanging
From: Scott Emmons <scotte AT CENTER.USCS DOT COM>
Date: Wed, 12 Aug 1998 12:27:27 -0700
Have just experienced a strange problem when using the "-ifnewer" flag on
ADSM v3.1/AIX4.2 client and server.

I have a number of fairly large filesystems (300MB-800MB, several hundred
files per), spread across multiple 3590 tapes (4 or so). To get a jump on
moving some filesystems, I did a restore of the filesystems during the
day, with the idea of doing a new incremental, and then a "-ifnewer"
restore during our limited downtime to get the filesystem up-to-date in
the new location as quickly as possible.

I used the command:

        dsmc restore -ifnewer -subdir=yes /old/path/ /new/

All the filesytems would fail when they would attempt to restore either
symbolic links or unix domain socket files over the original restore. The
clients would timeout and eventually generate ANR0481W messages on the
server after the COMMTIMEOUT period.

When I removed all the files, and did:

        dsmc restore -subdir=yes /old/path/ /new/

All was fine. Likewise, if I restored over the original restore doing:

        dsmc restore -ifnewer -subdir=yes -replace=all /old/path/ /new/

it would restore perfectly. What's interesting, is that without the
"-replace=all" flag, "-ifnewer" will, for some reason, normally ask
whether or not to overwrite symbolic link files (even if they have not
changed). However, on these long restores, all the client does is hang
until COMMTIMEOUT is reached. I have set COMMTIMEOUT to an outrageously
large number (1800 seconds), but it makes no difference.

I was interested to know if anyone has seen this problem, or could confirm
that it may indeed be a bug.

Thanks,
-Scott
________________________________________________________________________
________________________________________________________________________
    L. Scott Emmons    | CableData R&D Center - El Dorado Hills, CA, USA
Staff Software Engineer|  Unix Administration, Systems Development Dept
    (916) 939-6088     |  Views and content are my own, not CableData's
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