best filesystem for imap server

[Simon Matter]

> This is interesting because I have a linux box (RedHat AS3) using RAID 10.
>  I
> have some 5000 user accounts and anywhere from 2500 to 3000 concurrent
> IMAP
> sessions -- I think the Mulberry client opens multiple sessions since it's
> only some 300 to 500 individual concurrent users.  Anyway, what I
> especially
> notice is that when the mail delivery queue on the MTA gets very large,
> which
> happens occassionally, the CPU load average goes way up and iowait time as
> displayed using top can exceed 300% on a four processor box and
> performance
> goes all to heck.  Is switching the filesystem to XFS likely to help this
> situation?  Since there is some 80GB of mail spool currently in use,
> switching the filesystem to XFS is not a simple task and I don't won't to
> do
> it on a lark.

Your only problem here is that RedHat removes XFS from it's enterprise
kernels so you can't use it. I really blame RedHat for it. If you have
paid for your RedHat AS, I stronlgy suggest you complain there to get this
fixed. They could include the XFS kernel module in the unsupported
package.

Simon

>
> Thanks,
> Rob
>
>
> --On Wednesday, December 01, 2004 12:14:01 PM -0800 David Lang
> <david.lang at digitalinsight.com> wrote:
>
>> I've done some testing and seen a HUGE speedup when switching from
>> EXT2/3
>> to XFS. unfortunantly I haven't had a chance to do the same comparison
>> with
>> Reiserfs (I need to, but haven't had time)
>>
>> I was even able to see a dramatic difference with a single user
>> accessing a
>> fairly large mailbox (thousands of messages in the inbox)
>>
>> David Lang
>>
>
>
> --
> Rob Tanner
> UNIX Services Manager
> Linfield College, McMinnville OR
>
> ---
> 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
>
>


---
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