dovecot - Nov 2008 - two dovecot server using the same file system

Hi all.

 I want to use two servers with dovecot using a common file system with drbd.
So I have several questions.
 If one server write a mail to th file system he will use his name as
part of the mail identification.
the second server will use his own name. Each server will generate it
own mail numbers . When an imap or pop user will consult the mails i
shoul be confusion. Am I correct. is there a way of solving this
issue??


Thanks

Osvaldo Alvarez Pozo schrieb:
> Hi all.
> 
>  I want to use two servers with dovecot using a common file system with
drbd.
> So I have several questions.
>  If one server write a mail to th file system he will use his name as
> part of the mail identification.
> the second server will use his own name. Each server will generate it
> own mail numbers . When an imap or pop user will consult the mails i
> shoul be confusion. Am I correct. is there a way of solving this
> issue??
> 
> 
> Thanks
Hi Oswaldo,
 i will test all this during next weeks
i had positv reports with ocfs2 and iSCSI
so it should work with drbd and ocfs2

-- 
Best Regards

MfG Robert Schetterer

Germany/Munich/Bavaria

on 11-21-2008 1:53 AM Osvaldo Alvarez Pozo spake the
following:
> Hi all.
> 
>  I want to use two servers with dovecot using a common file system with
drbd.
> So I have several questions.
>  If one server write a mail to th file system he will use his name as
> part of the mail identification.
> the second server will use his own name. Each server will generate it
> own mail numbers . When an imap or pop user will consult the mails i
> shoul be confusion. Am I correct. is there a way of solving this
> issue??
> 
> 
> Thanks
> 
I thought DRBD only let one node have write access to the shared filesystem at
a time?


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You hope everybody uses it, and
you notice quickly if they don't!!!!

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On Fri, 21 Nov 2008, Scott Silva wrote:
> I thought DRBD only let one node have write access to the shared filesystem
at
> a time?
And I though DRDB is not a filesystem at all, but a block sharing 
protocol.

http://www.drbd.org/home/mirroring/

is very clear about it:

"A consequence of mirroring data on block device level is that you can 
only access your data (using a file system) on the active node. This is 
not a shortcoming of DRBD; this is caused due to the nature of most file 
systems (ext3, XFS, JFS, ext4, ...). These file systems are designed for 
one computer accessing one disk, so they cannot cope with two computers 
accessing one (virtually) shared disk."

Just use a filesystem that allows to be accessed multiple times natively. 
Unfortunately, DRDB.org does not mention a filesystem to overcome the 
restriction.

Bye.

- -- 
Steffen Kaiser
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Steffen Kaiser wrote:
> Just use a filesystem that allows to be accessed multiple times
> natively. Unfortunately, DRDB.org does not mention a filesystem to
> overcome the restriction.
>
OCFS2 or GFS(2) are the usual suspects... be prepared for the
performance hit and fun with fences/quorum though, particularly with
only two nodes