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.