You may want to ping Novell to get the 1.2.3 drop of OCFS2. That's
because it is the latest and greatest.
Having said that we'll need more information.
As in, what syscall did strace show as taking time.
What is the memory usage like? cat /proc/meminfo, cat /proc/slabinfo
That is, under production load.
[EMAIL PROTECTED] wrote:
Hello,
we are running SLES9 SP3 with OCFS2 for mailsystem. There are three
nodes in the cluster with shared storage and OCFS2 filesystem on it.
The filesystem is used for mailbox storage and is accessed by smtpd
,pop3 and imap processes. The system works fine for a few hours but
locks up so that the OCFS2 filesystem is accessed by mail system
extremely slowly. It is possible to list the contents of the
filesystem or to change the directories, but mailsystem is working
slowly. Tracing smtp processes with strace showed that mail is
delivered to mailboxes but it is done in a speed of few kilobytes per
second.
This lock up happens under heavier load when the cluster is in
production use and when it happens only restart fixes the problem. The
umounting of the OCFS2 filesystem is not possible even when all
process accessing it are killed. Currently mail system cluster is not
used in production so we tried to do some tests, but we were not able
to replicate the problem while sending several thousands of messages
to a single account.
The only thing that comes in mind, that the filesystem locks in the
case when a file (message) is access by smtp process and pop3 or imap
process simultaniously when the processes are running on distinct
cluster nodes. This might happen because of lack of global knowledge
of localy locked files among OCFS2 cluster nodes.
Could this be true?
And what other reasons might be there for the problem?
Any suggestions on solving the problem?
The system information follows:
OS: Suse Linux Enterprise Server 9 Service Pack 3
Mailbox format: Maildir
SMTP daemon: Postfix (postfix-2.2.6-0.1)
OCFS2 version: 1.2.1
Kernel Version: 2.6.5-7.276-smp
Pop3 and imap daemon: Courier IMAP (courier-imap-4.1.0-1.suse910)
--
Augustas Gutautas
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