Re: Out of ideas - migrating from 3.0

Le 11/05/2026 =C3=A0 11:16:31+0200, Per olof Ljungmark a =C3=A9crit
Hi,

> Trying for the Nth. time to upgrade from 3.0.18 to newer (3.2.12 currentl=
y)
> version using sync, the plan is to increment upgrade to 3.4 and so on.
>
> It is a very standard setup, no murder etc., around 500GB mailstore, 100+
> accounts..
>
> Switched from Xapian to Squatter
> Disabled and removed conversations (-z)
> Restarted imapd
>
> Replication runs fine for about 2/3 of the accounts, then bails out.
>
> Ran all sorts of reconstruct on the specific mailbox, checked telemetry e=
tc
> etc nothing helps.
>
> Debugging Cyrus IMAP is not exactly a walk in the park, how can I find wh=
at
> is wrong with this specific account?
>
> sync_client -vv  -l dumps a LOT of info but where in there do I see the
> problem?

I wouldn't answer your question about what append because I've no clue.

All I can say is I made the upgrade from 3.0.something on Freebsd to 3.6.1
on Debian with imapsync.

It's a little painful but work fine. The first time of the sync is long
(don't remember exactly but it's around 12 h). The last sync (no service)
is around 1 h for ~ 100 000 mailbox ~ 10To.

And in this 1h, 90% is for one mailbox who is a little =C2=ABcrazy=C2=BB wi=
th one
mailbox of 250 000 mails.

Because the imapsync is working with the imap protocol I'm =C2=ABsure=C2=BB
everything is create as it should be on the new server.

I'm write some basic script to sync the acl.

Same thing with sieve.

Regards


--
Albert SHIH =F0=9F=A6=AB =F0=9F=90=B8
France
Heure locale/Local time:
lun. 11 mai 2026 11:19:53 CEST

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