Re: ceph for small cluster?

[Miles Fidelman <mfidelman@meetinghouse.net>]

Wido, Thanks for the comment, a follow-up if I might (below)?

Wido den Hollander wrote:
>
> I build some small Ceph cluster with sometimes just 3 nodes. It works,
> but you have to keep in mind that when one node in a 4 node cluster
> fails you will loose 25% of the capacity.
>
> This will lead to a heavy recovery within the Ceph cluster which will
> but a lot of pressure on that Gbit links and the CPUs and memory of
> the nodes.
>
> With RBD you might want to consider adding an SSD for the journaling
> of the OSDs, that will give you a pretty nice performance boost.
>
Would not journalling alone, say on a separate hard disk volume, help
with recovery?

Thanks,

Miles

-- 
In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra