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- What: /sys/bus/rbd/
- Date: November 2010
- Contact: Yehuda Sadeh <yehuda@newdream.net>,
- Sage Weil <sage@newdream.net>
- Description:
- Being used for adding and removing rbd block devices.
- Usage: <mon ip addr> <options> <pool name> <rbd image name> [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 <dev-id>
- will be assigned for any registered block device. If snapshot is used, it will
- be mapped read-only.
- Removal of a device:
- $ echo <dev-id> > /sys/bus/rbd/remove
- Entries under /sys/bus/rbd/devices/<dev-id>/
- --------------------------------------------
- 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.
- image_id
- The unique id for the rbd image. (For rbd image format 1
- this is empty.)
- pool
- The name of the storage pool where this rbd image resides.
- An rbd image name is unique within its pool.
- pool_id
- The unique identifier for the rbd image's pool. This is
- a permanent attribute of the pool. A pool's id will never
- change.
- 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 <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create
- snap_*
- A directory per each snapshot
- Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
- -------------------------------------------------------------
- snap_id
- The rados internal snapshot id assigned for this snapshot
- snap_size
- The size of the image when this snapshot was taken.
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