Ceph - howto, rbd, lvm, cluster

Install ceph

wget -q -O- https://raw.github.com/ceph/ceph/master/keys/release.asc | apt-key add -
echo deb http://ceph.com/debian/ $(lsb_release -sc) main | tee /etc/apt/sources.list.d/ceph.list
apt-get update && apt-get install ceph

Video to ceph intro

https://www.youtube.com/watch?v=UXcZ2bnnGZg
http://www.youtube.com/watch?v=BBOBHMvKfyc&feature=g-high

Rebooting node stops everything

Make sure that the min replica count is set to nodes-1.

ceph osd pool set <poolname> min_size 1

Then the remaing node[s] will start up with just 1 node if everything else is down.

Keep in mind this can potentially make stuff ugly as there are no replicas now.

More info here: http://comments.gmane.org/gmane.comp.file-systems.ceph.devel/10481