Hi,
Quoting Ian Batten via Info-cyrus <info-cyrus@lists.andrew.cmu.edu>:
Hi, long-time Cyrus user (25 years, I think), but stumped on this one…
I have an ancient Cyrus 2.5.11 on Solaris 11 installation I am
trying to migrate off. The strategy is to run rolling replication
onto the new server (3.0.8-6+deb10u4 on Debian 10.4), and then point
the DNS record at the new server. With Covid, this has become more
protracted than I would like, as I don’t want to accidentally mess
up users who are isolating, so the replication has been running for
some weeks.
The replication structure is old-server -> new-server -> (backup1,
backup2) where backup1 and backup2 are configured as separate
channels on new-server. This has been running seemingly correctly
for about three months now.
Today I decided to check all was well by using rsync -an to confirm
that the replicas have everything that is on the master. They do,
in that using
rsync -anvO --size-only --exclude='cyrus.*'
root@mail:/var/imap/partition1/user/ /var/imap/partition1/user
where “mail” is the old server shows that there are no messages
missing (—size-only because there’s some time slew in a few places,
usually only of a few seconds, but up to a day in others).
However, reversing it:
rsync -anvO --size-only --exclude='cyrus.*'
/var/imap/partition1/user/ root@mail:/var/imap/partition1/user
Shows that there are a _lot_ of files on the replicas which are not
on the master, some of them relating to recent deletions, but some
of them seemingly quite old. I am using:
delete_mode: delayed
expunge_mode: delayed
everywhere, running cyr_expire on the master but not on the
replicas. I have enough bandwidth that sync_reset and re-sync is
realistic, but I’d rather not have to do that immediately prior to a
cut-over. These old files are a worry because if I ever had to
reconstruct one of the mailboxes, presumably the deleted (I think)
messages would all reappear. Does anyone have any suggestions?
you also need to run cyr_expire on the "new_server" to remove the old
expunged mails and deleted folders.
I haven't used replication for backup but I suspect that cyr_expire is
also required your backup servers
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