Ceph

In http://docs.ceph.com/docs/v0.80.5/start/quick-ceph-deploy/, it reads:

A Ceph Storage Cluster requires at least one Ceph Monitor to run. For high availability, Ceph Storage Clusters typically run multiple Ceph Monitors so that the failure of a single Ceph Monitor will not bring down the Ceph Storage Cluster. Ceph uses the Paxos algorithm, which requires a majority of monitors (i.e., 1, 2:3, 3:4, 3:5, 4:6, etc.) to form a quorum.

Add two Ceph Monitors to your cluster.

ceph-deploy mon *create* {ceph-node}

For example:

ceph-deploy mon *create* node2 node3

But it should be "*add*" rather than "*create*".