[Gluster-users] Avoid Split-brain and other stuff

[John Mark Walker]

I think now is a good time to mention the quorum enhancements going into 3.4. I believe we'll have a way to determine quorum and resolve split-brain even in replica 2 setups. This will be possible via the creation of an arbiter node, which isn't a separate server, and whose sole job will be to determine quorum and determine the direction for self-heal. 

I'll leave it to the devs to comment on how much is implemented now and whether it's in the master branch.

-JM


----- Original Message -----
> Hi!
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Brian Candler [mailto:B.Candler at pobox.com]
> > Gesendet: Freitag, 16. November 2012 09:28
> > An: Martin Emrich
> > Cc: gluster-users at gluster.org
> > Betreff: Re: [Gluster-users] Avoid Split-brain and other stuff
> > 
> > > That would be perfectly acceptable, as long as it would heal
> > > deterministically (last one wins, or renamed conflicting files)
> > 
> > Not for me it wouldn't. "Last one wins" means "one set of updates
> > thrown
> > away", i.e.  definite data loss, which will be compounded when
> > further
> > updates take place.
> > 
> > Automatic renaming means either that the file vanishes from its
> > original name
> > (so the application which looks for the file breaks anyway), or
> > that one version
> > has the original name and the other version is renamed - which can
> > also result
> > in irrepairable damage.
> 
> For my use case (File server), that would be highly unlikely, and
> acceptable in rare cases.
> Of course it would be a "No-Go" for computing applications or
> database storage.
> 
> > What you don't want is both nodes to be up, both reachable only by
> > a subset
> > of clients, and updates occurring on both.
> 
> Hmm, that's exactly what I want (Branch offices temporarily
> disconnected can continue to work), thus GlusterFS is probably not
> the right tool for me.
> 
> Ciao
> 
> Martin
> 
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