Clustering and replication

[Janne Peltonen]

On Fri, Jan 26, 2007 at 12:07:49AM -0800, Tom Samplonius wrote:
> 
> ----- Janne Peltonen <janne.peltonen at helsinki.fi> wrote:
> > Hi!
> > 
> > As a part of our clustering Cyrus system, we are considering using
> > replication to prevent a catastrophe in case the volume used by the
> > cluster gets corrupted. (We'll have n nodes each accessing the same GFS,
> > and yes, it can be done, see previous threads on the subject.)
> 
>   I really doubt this.  Even if GFS works the way it says it does,
>   Cyrus does not expect to see other instances modifying the same
>   message, and does not lock against itself.

I'm not entering this discussion again. ;) There are long threads on
this subject, especially since last October. See the archives.

>[...]
>   The Cyrus master builds a replication log as changes are made by
>   imapd, pop3d, and lmtpd.  The log contents are pushed to the
>   replica.

OK. Thanks.


--Janne