What: /sys/bus/rbd/ Date: November 2010 Contact: Yehuda Sadeh , Sage Weil Description: Being used for adding and removing rbd block devices. Usage: [snap name] $ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add The snapshot name can be "-" or omitted to map the image read/write. A will be assigned for any registered block device. If snapshot is used, it will be mapped read-only. Removal of a device: $ echo > /sys/bus/rbd/remove Entries under /sys/bus/rbd/devices// -------------------------------------------- client_id The ceph unique client id that was assigned for this specific session. major The block device major number. name The name of the rbd image. pool The pool where this rbd image resides. The pool-name pair is unique per rados system. size The size (in bytes) of the mapped block device. refresh Writing to this file will reread the image header data and set all relevant datastructures accordingly. current_snap The current snapshot for which the device is mapped. create_snap Create a snapshot: $ echo > /sys/bus/rbd/devices//snap_create rollback_snap Rolls back data to the specified snapshot. This goes over the entire list of rados blocks and sends a rollback command to each. $ echo > /sys/bus/rbd/devices//snap_rollback snap_* A directory per each snapshot Entries under /sys/bus/rbd/devices//snap_ ------------------------------------------------------------- id The rados internal snapshot id assigned for this snapshot size The size of the image when this snapshot was taken.