[Dovecot] Same filenames on different servers?

[Alexander Chekalin]

In fact I just try to understand if Dovecot's behaviour  is right and my 
expectations are wrong, or vise versa. I mean when server see two 
identical messages (files) both in cur and in new dirs it can compare 
these files not only by name and rename if these names are the same, but 
maybe check content of the messages.


11.01.2010 16:11, Tom Hendrikx пишет:
> Hi,
>
> This is a general backup issue (files changing during backup run) and
> nothing Dovecot specific. You should look into something that gives you
> a consistent view of the data, f.i. LVM snapshots (when you're running
> linux).
>
> Regards,
> 	Tom
>
> Alexander Chekalin wrote:
>> Yes, I'm trying to make some backup solution.
>>
>> The idea was to have two identical (well, nearly identical) servers with
>> the same software and data on them, and while the first do its job as
>> SMTP and POP3/IMAP4 server, the second server just get copy of first's
>> current state (that is, copy user db and mail spool). In case of
>> something wrong with 1st server I'll just put its IP on second one and
>> will go on.
>>
>> And the problem is that rsynced mailboxes sometimes have duplicates that
>> may confuse users. It happens when box changes between rsyncs by means
>> of Dovecot's ordinary operations (when msg file move from new/ to cur/
>> on 1st server and after rsync to 2nd this may produce two files with
>> same filename in new/ and cur/, and Dovecot for some reason renames one
>> of it).
>>
>> Doing this using imapsync won't work. It is slow (hours vs minutes with
>> rsync) so I can't run it every 5 minutes, and, moreover, it crashes on
>> some messages, so can not rely on it in production.
>>
>> Yours,
>>    Alexander
>>
>> 11.01.2010 15:07, Charles Marcus wrote:
>>> On 2010-01-11, Alexander Chekalin (achekalin at lazurit.com) wrote:
>>>> I'm not sure if this is intended behaviour. It is quite easy to see
>>>> such situation when doing periodical rsync (SMTP put message to new/
>>>> dir, then rsync copy it to second server, then message on the first
>>>> server move to cur/, and second rsync results in two files on second
>>>> server).
>>>>
>>>> It there any workaround?
>>>
>>> I would only use rsync for migrating to a new box, or for backups only...
>>>
>>> It soundslike you're using the wrong tool for the job - maybe you should
>>> be using something like imapsync?
>>>
>>> Or, please describe what you are trying to accomplish?
>>
>