On Tue, 2007-10-02 at 17:46 +0200, Jon Blazquez wrote: > Hello, > We are running Red Hat Enterprise Linux AS release 4 (Nahant Update 4) > with OCFS2 for our mail servers. There are three nodes in the cluster > with shared storage and OCFS2 filesystem on it. The filesystem > is used for mail storage(using Maildir layout) and is accessed by smtpd, > pop3 and imap processes(DOVECOT). > The system works fine but when there are mailing lists the load > increases dramatically.
So you mean everything works ok as long as messages are saved into only a few mailboxes, but once there comes a burst of messages to lots of different mailboxes the load increases? Is it just one node doing the writes or all 3 at the same time? If all 3, does it work better if only 1 is doing it? How long are the deliver processes running? If they're there long enough to be straced, check what syscalls are taking the longest.
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