implementing folder hashing

[Adrian Minta]

I need to move from one mount point to multiple mount points and I'm 
searching for the best strategy.

Right now my take is to script a rsync of the folders that need moving, 
change dovecot config and restart.

In order to do this I need to know in advance what users will end up on 
the newly added mount point.

Thank you for 'doveadm user'. This seems to be the appropriate tool.


On 9/23/20 8:07 PM, Manuel Delgado wrote:
> I think I don't understand the question.
>
> Dovecot knows where the user's home is, you don't need to guess. With 
> mail_home or with Passdb variables you can define the user's home 
> location and you can use 'doveadm user' to show where the home 
> directory is in the filesystem.
>
> However, if you are migrating I would use dovecot sync or similar tool 
> instead of doing the manual process.
>
> Regards
> Manuel Delgado
>
> On Wed, Sep 23, 2020 at 10:46 AM Adrian Minta <adrian.minta at gmail.com 
> <mailto:adrian.minta at gmail.com>> wrote:
>
>     Thank you for your reply.
>
>     One questionthough, if you add a mount point how do you know what
>     user to move ?
>
>
>     On 9/23/20 7:35 PM, Manuel Delgado wrote:
>>     Hi Adrian,
>>
>>     It depends much on your site configuration.
>>
>>     In our case, we have several mount points and we distribute our
>>     user mailboxes using username hash (%N)[1] and limit this hash to
>>     the number of mount points. We preferred %N over %H because the
>>     distribution of users was much better.
>>
>>     Ex. xstore%2.3Nn turns to xstore00, xstore01 and xstore03.
>>
>>     Regards
>>     Manuel Delgado
>>
>>     [1]
>>     https://doc.dovecot.org/configuration_manual/config_file/config_variables/#modifiers
>>
>>     -----------------------------------------------------------
>>
>>     **
>>     *Usuario Linux* /#520940 <http://counter.li.org/>/
>>
>>
>>
>>
>>
>>     On Mon, Sep 21, 2020 at 8:24 AM Adrian Minta
>>     <adrian.minta at gmail.com <mailto:adrian.minta at gmail.com>> wrote:
>>
>>         Hi everyone,
>>
>>         I want to ask if any of you has done a migration from a
>>         single storage
>>         to multiple back-end storages and what is the best strategy
>>         for folder
>>         hashing that you use.
>>
>>         Using something like %H or %M how do you predict where the
>>         mail will end
>>         up in order to move the existing folders ?
>>
>>         Thank you !
>>
>>         -- 
>>         Best regards,
>>         Adrian Minta
>>
>>
>     -- 
>     Best regards,
>     Adrian Minta
>
>
-- 
Best regards,
Adrian Minta


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