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During this step, ceph will build a RADOS block device (RBD) from ceph_osd_disk. A storage entry (a pool) will be automatically generated for libvirt. When the service will be started, the device hypervisor should be used by the VMsto launch VMs.
On the ceph_osd_disk of all machines, there are the same data.
This disk will be used with the librbd library provided by ceph.
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More details here.