1What:		/sys/bus/rbd/
2Date:		November 2010
3Contact:	Yehuda Sadeh <yehuda@newdream.net>,
4		Sage Weil <sage@newdream.net>
5Description:
6
7Being used for adding and removing rbd block devices.
8
9Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name]
10
11 $ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add
12
13The snapshot name can be "-" or omitted to map the image read/write. A <dev-id>
14will be assigned for any registered block device. If snapshot is used, it will
15be mapped read-only.
16
17Removal of a device:
18
19  $ echo <dev-id> > /sys/bus/rbd/remove
20
21Entries under /sys/bus/rbd/devices/<dev-id>/
22--------------------------------------------
23
24client_id
25
26	The ceph unique client id that was assigned for this specific session.
27
28major
29
30	The block device major number.
31
32name
33
34	The name of the rbd image.
35
36pool
37
38	The pool where this rbd image resides. The pool-name pair is unique
39	per rados system.
40
41size
42
43	The size (in bytes) of the mapped block device.
44
45refresh
46
47	Writing to this file will reread the image header data and set
48	all relevant datastructures accordingly.
49
50current_snap
51
52	The current snapshot for which the device is mapped.
53
54create_snap
55
56	Create a snapshot:
57
58	 $ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create
59
60snap_*
61
62	A directory per each snapshot
63
64
65Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
66-------------------------------------------------------------
67
68id
69
70	The rados internal snapshot id assigned for this snapshot
71
72size
73
74	The size of the image when this snapshot was taken.
75
76
77