From: Daniel Eckl (no email)
Date: Mon Jul 03 2006 - 12:11:34 EDT
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
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