On Mon, 9 Nov 2009, Jürgen Herrmann wrote:
> hi there!
>
> i plan to set up a ceph fs for our mail cluster testing.
> initially i want to have 2 mds and 2 osds, one on each of the
> involved machines. each machine would mount the ceph fs.
> so in the non-failure case every client could read from
> the local osd, is there a way to assure that?
No, Ceph currently does not routing of requests to replicas based on how
close they are. You should also be careful running an OSD on the same
node as the kernel client, as there are theoretical deadlocks possible
when memory is low.
For a simple two node setup, you may be better off with something like
OCFS2 and a shared block device (DRDB?).
> is the requirement to have at least 3 mons in clustered mode
> still in effect? reading
> http://ceph.newdream.net/wiki/Monitor_cluster_expansion
> one could come to the conclusion that having 2 mons is
> working too.
It's possible to have two monitors, and it improves durability in that the
total loss of a single node won't permanently kill the monitor's data, but
availability is worse because the failure of either node will deactivate
the cluster (a majority of monitor nodes must be online to be active).
3 monitors is better.
sage
>
> thanks in andvance,
> jürgen
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