gistfile1.diff

You can use  OpenStack Glance to store images in a Ceph Block Device, and you
 +- **Guest Disks**: Guest disks are guest operating system disks.
 +  By default, when you boot a virtual machine,
 +  its disk appears as a file on the filesystem of the hypervisor
 +  (usually under ``/var/lib/nova/instances/<uuid>/``). Since Havana, it’s
 +  possible to directly boot every virtual machine inside Ceph.
 +  This is really handy because it allows us to easily perform
 +  maintenance operation with the live-migration process.
 +  On the other hand, if your hypervisor dies it’s also really convenient
 +  to trigger ``nova evacuate`` and almost seamlessly run the virtual machine
 +  somewhere else.