Re: implementing folder hashing

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 mailto:adrian.minta@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

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On Mon, Sep 21, 2020 at 8:24 AM Adrian Minta
<adrian.minta@gmail.com <mailto:adrian.minta@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