...

• ceph_cluster_network: Address block to access to cluster network
• ceph_public_network: Address block to access to public network (ie to the world)

• ceph_osd_disk: Device to stock datas (only for ceph-osd hosts), it's on this disk ceph will build a rbd.

• osd_pool_default_min_size: Minimal number of available OSD to ensure cluster success (best: ceil(osd_pool_default_size / 2.0))

• osd_pool_default_size: Number of OSD in the cluster

...

• there is a rbd pool with this command: ceph osd pool list.
• there is a ceph pool with this command: virsh pool-list.

RADOS Block Devices

During this step, ceph will build a RADOS block device (RBD) from ceph_osd_disk. This disk will be used with the librbd library provided by ceph.