migration with doveadm backup to new cluster running dovecot 2.2.36 and replicator

[Andrea Gabellini]

Hello,

I had a similar problem some time ago, and the problem was the mailbox
format change.

Please try to migrate with the same format.

Andrea

Il 05/01/21 15:02, Thomas Winterstein ha scritto:
> No one?
>
> If there are limitations in regards to how dsync in migration and
> replication can operate together these should be stated clearly in the
> documentation.
>
> On 23.12.2020 20:33, Thomas Winterstein wrote:
>> Hello everyone,
>>
>>
>> we are working on migrating from dovecot 2.0.9 (maildir) to 2.2.36
>> (mdbox). The new cluster has two backend mail servers which replicate
>> through doveadm replicator. To move the data initially we use doveadm
>> backup (imapc).
>>
>> arb
>> Our migration command
>>   doveadm -o mail_fsync=never backup -R -u $user imapc:
>>
>>
>> To test the replication of new and purge of old mails with live data
>> changes we ran imapc on a daily basis but encountered the problem
>> that some mailboxes multiplied in size. We then made sure that imapc
>> and replication don't run at the same time but after the first
>> incremental imapc process, we still had the same problems.
>>
>>
>> The doveadm-backup man-page states that it's possible to run it
>> multiple times during migration. But is it also possible to have the
>> replicator running in between? From our understanding the doveadm
>> backup should just work as an imap connection between the servers,
>> synchronizing all changes made on the source to the destination. Or
>> does the conversion from maildir to mdbox format in our case produce
>> the problems?
>>
>>
>> If you're not supposed to run the replicator before having fully
>> migrated, how can we shorten the downtime? rsync? And how can we be
>> sure that similar problems don't occur after the migration if we
>> can't test all mechanisms together with live data?
>>
>>
>> thanks
>
>

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TIM San Marino S.p.A.
Andrea Gabellini
Engineering R&D
TIM San Marino S.p.A. - https://www.telecomitalia.sm
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