Yes, it's safe to ignore that - a highermodseq warning does mean that something 
got changed on the replica, but the replication protocol will repair that and 
bring the mailboxes back into sync safely.

Cheers,

Bron.

On Thu, Oct 20, 2022, at 12:22, Karl Pielorz wrote:
> 
> Hi,
> 
> We're running Cyrus 3.2.x
> 
> I recently moved a replica Cyrus IMAP server to a different box - when I
> tried to re-start replication, the replica grumbled in the logs:
> 
> Oct 20 12:52:14 syncserver[63316]: higher modseq on replica user.fred.Logs
> - 1707305 < 1751211
> 
> I had to leave the box then - but from what I quickly read looking around,
> that would "stop" replication for safety reasons, because something had
> changed on the replica.
> 
> However, getting back to the box now - the source has finished processing
> the run-log etc. - and sync_server is still running on the source.
> 
> The replica logged a bunch of 'modseq' warnings for various mailboxes - but
> still seems to be tracking the source.
> 
> So my question is - is it safe it ignore these warnings? - And presume it's
> ok? - Because the source is still happily running sync_server and sending
> the changes?
> 
> I'm not sure how this happened - the original replica was on a machine that
> had imapd shutdown, then the filesystem snapshotted and moved to another
> box (and spun up there).
> 
> Normally no one can log into the replica.
> 
> I'm also sure in the past - the replica has been logged into by me (and
> noted changes on the replica, migrate back to the source) - in fact, I just
> did this - and the mailboxes on the replica seem fine / up to date (and
> flagging a message - it does, indeed replicate back to the source the next
> time the source runs a sync for that mailbox).
> 
> So ultimately - is it safe to ignore this warning? e.g. Will it happen only
> for each mailbox once?
> 
> -Karl
> 

--
  Bron Gondwana, CEO, Fastmail Pty Ltd
  br...@fastmailteam.com


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