Re: [Exim] appendfile creating non-contigous data

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Autor: Joseph Kezar
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A: Nigel Metheringham
CC: exim-users
Assumpte: Re: [Exim] appendfile creating non-contigous data
Average mailbox size is around 35MB. There are around 30 dead accounts
that just collect mail.
We currently use UW IMAP. Are there migration tools to take our
existing mailbox(appendfile) and convert to maildir or mbox? Does UW
IMAP support these?

Thanks for your help,
Joe Kezar

Nigel Metheringham wrote:

>On Thu, 2004-02-26 at 17:00, Joseph Kezar wrote:
>
>
>>We have about 1100 users on our system. After about 1 month the ext3
>>filesystem get 80% non-contigous and the load soars with an average of
>>around 7. The performance suffers until I take the server offline and
>>archive to tape and recreate my ext3 partition and then read it all back
>>from tape. After which I am down to about 3% non-contigous. After
>>which it performs like a charm for awhile. I know appending to the
>>bottom of files is bad practice, but I dont know any other ways. Any
>>ideas I would appreciate greatly.
>>
>>
>
>How full is the disk running? - this is very odd frankly as the file
>should be rewritten each time anyone deletes any mail from the file,
>unless the thing is so damn full it cannot rewrite the file
>contiguously.
>
>Do you have a batch of users that receive but never delete mail?
>Maybe there is a spam receiver.....
>
>Do you have a lot of *large* mboxes?
>
>Under these conditions I would look at using a different mail storage
>format (maildir or mbx) or a different filesystem (xfs), although it
>sounds as though there is some usage pattern that is driving it this
>way.
>
>    Nigel.

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