Re: Ceph on just two nodes being clients - reasonable?

[Tomasz Chmielewski <mangoo@wpkg.org>]

On 19.01.2011 12:41, Wido den Hollander wrote:
> Hi Thomas,
>
> I think the answer is Yes and No on this question, the devs might have
> another approach for your situation.
>
> If you would do this, you would have a MON, MDS and OSD on every server,
> in theory that would work. Mounting would be done by connecting to on of
> the MON's (doesn't matter which one).
>
> But Ceph requires, well, advises a odd number of monitors (Source:
> http://ceph.newdream.net/wiki/Designing_a_cluster )
>
> So you would require a third node which is running your third monitor to
> keep track of both nodes.
>
> My advise, for two nodes, use something like DRBD in Primary<>  Primary
> and use a cluster filesystem like OCFS2.

Currently, I'm running glusterfs in such a scenario (two servers, each 
being also clients), but I wanted to give ceph a try (glusterfs has some 
performance issues with lots of small files), also because of its nice 
features (snapshots, rbd etc.).


-- 
Tomasz Chmielewski
http://wpkg.org