Messages in this thread | | | From | Denis Vlasenko <> | Subject | Re: server migration | Date | Sun, 7 Mar 2004 01:33:07 +0200 |
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On Friday 05 March 2004 20:13, Lawrence Walton wrote: > Hi all! > > I tried about four months ago to migrate a busy server to 2.6.0-test9, > and failed miserably. Lightly loaded it worked well but as the number > of users increased, the number of processes in uninterruptible sleep > increased to the hundreds and then the server fell on it's face. I never > found out exactly why or what processes where hanging if I guessed it > would be openldap.
Why do you guess? Determine what processes are stuck.
> I'd like to take another shot at it with 2.6.3, I'd also like to get > some hints on how better to debug the problem; remember it is a live > server with live users, I can't spend much time before rebooting back to > a 2.4 kernel and yes 2.4.25 runs fine. > > Things that are non-standard > > Lots of open files, it's not unusual to have 50000 open files. > ext3 is mounted noatime,data=writeback on /home and /var > Total processes are usually around 300 to 350. > > Main applications are: > > imap, exim and openldap running on Debian. > > Questions, comments, flames are welcome.
Compile with stack pointers, capture SysRq-T, post stack traces of D processes to lkml. -- vda
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