[Dovecot] Basic clustered filesystem advice

[Robert Schetterer]

Am 16.09.2013 15:24, schrieb Simon Fraser:
> 
> Time marches on, and I need to continue the service migration. I'd still
> like to use Dovecot (we're migrating away from Cyrus).  I'm assuming the
> only other alternative without existing shared storage is to use DRBD
> and a cluster file system to provide the replication, and to ensure
> Director is enabled.  Are there any things to watch for surrounding
> this? 
> 
> Simon.

please search the list archives, there are many posts with clustered
filesystems or nfs setups, both are possible, depends what might fit
best at your place / size, i have ocfs2 and drbd cluster working with
maildir on ubuntu lucid
( for better performance in special with bigger mailboxes dbox or mdbox
might be better today ) behind loadbalancers, if you brave you might try
ceph


perhaps have a look

http://sys4.de/de/blog/2013/06/10/loadbalancing-mit-keepalived-postfix-dovecot/

http://sys4.de/de/blog/2013/06/06/postfix-dovecot-ceph-cluster-storage/

sorry only german

i have no good reports in using gfs2 for cluster, but this might got
fixed recent

> 
> 
> On Fri, 2013-08-30 at 09:49 +0100, Simon Fraser wrote:
>> On Mon, 2013-08-19 at 12:08 +0100, Simon Fraser wrote:
>>> Are there any more tests I can run for this? 
>>
>> I've tried an ssh-based replication configuration, and still experience
>> the same symptoms. Going through a director proxy also doesn't help (as
>> expected, that one, since I was already only connecting to one of the
>> servers)
>>
>> Simon.
>>
>>> On Thu, 2013-08-08 at 09:21 +0100, Simon Fraser wrote:
>>>> On Tue, 2013-08-06 at 19:15 +0300, Timo Sirainen wrote:
>>>>
>>>>>> Presumably it's thinking the "-r /tmp/dsync-rawlog" is a mail location?
>>>>>> I've tried changing its location in the appends, but it doesn't make a
>>>>>> difference. 
>>>>>
>>>>> Oops, I messed up the parameter order. It was supposed to have -s state but now it had -s -r rawlog state. New patch should work better.
>>>>
>>>> I ran two tests: one using 'doveadm expunge' and one deleting the
>>>> message using mutt. Since the hosts mentioned so far have a copy of my
>>>> full mailbox on, I re-ran the tests (with the same results) on a test
>>>> server with a fresh mailbox on, so there was no extra folder
>>>> synchronisation in there to fill up the rawlog. 
>>>>
>>>> Those log entries are too big for the mailing list (70k+), so are here:
>>>>
>>>> 'doveadm expunge' dsync-rawlog node A
>>>> http://pastebin.com/LtUnENPv
>>>>
>>>> 'doveadm expunge' dsync-rawlog node B
>>>> http://pastebin.com/QaWLyZq2
>>>>
>>>> imap expunge dsync-rawlog node A
>>>> http://pastebin.com/SuFdWn0w
>>>>
>>>> imap expunge dsync-rawlog node B
>>>> http://pastebin.com/Ex66s7hq
>>>>
>>>> Mail logs on both contain entries like this:
>>>> Aug  6 18:04:37 dcot2a dovecot: master: Dovecot v2.2.5 starting up (core
>>>> dumps disabled)
>>>> Aug  6 18:04:38 dcot2a dovecot: doveadm: Error: Don't give mail location
>>>> with -d parameter
>>>>
>>>> Simon.
>>>>
>>>>
>>>>
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> 
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> 



Best Regards
MfG Robert Schetterer

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