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).
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
--
Thomas Winterstein
