Well, I was surprised about the problem... I have only about 250 mailboxes on that server. But it's used extensively, because some users have over 200 folders and an incredible mail count (mailboxes over 2 GB of size). I assume, my problem comes from Outlooks scanning all headers of a big folder, because the load and IO increase comes with a lot of disk activity (high bi/bo in vmstat). But it has to be only one or two clients, because in the main usage time there is mostly no problem and disk io is moderate to low... I cannot identify the triggering client and/or the action it starts.... Thanks for your suggestions, I will try if that makes a difference and report to the list for the archives! Thanks, Daniel Wesley Craig schrieb: > On 03 Jul 2006, at 11:35, Daniel Eckl wrote: >> At this time I didn't change the scheduler. In fact, I actually learned >> about it a few days ago... So it was SuSE 9.3 default (might be vanilla >> default, don't know) > > I think "anticipatory" is the default IO scheduler for SuSE 9.3 (from > Google). > >> What would you recommend for cyrus? (or for ext3 running cyrus)? And are >> there prefered scheduler for other fs, too, especially reiser and xfs? > > It would probably depend on your setup. Given the problem you describe, > tho, I would think that "deadline" would improve your performance. The > 2.6 kernel has many tunable parameters. If you're pushing a server at > all near its limits, you probably need to become an expert in > performance tuning. Or buy more hardware :) > > :wes ---- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
