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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
What: /sys/bus/rbd/add_single_major
Date: December 2013
KernelVersion: 3.14
Contact: Sage Weil <sage@inktank.com>
Description: Available only if rbd module is inserted with single_major
parameter set to true.
Usage is the same as for /sys/bus/rbd/add. If present,
should be used instead of the latter: any attempts to use
/sys/bus/rbd/add if /sys/bus/rbd/add_single_major is
available will fail for backwards compatibility reasons.
What: /sys/bus/rbd/remove_single_major
Date: December 2013
KernelVersion: 3.14
Contact: Sage Weil <sage@inktank.com>
Description: Available only if rbd module is inserted with single_major
parameter set to true.
Usage is the same as for /sys/bus/rbd/remove. If present,
should be used instead of the latter: any attempts to use
/sys/bus/rbd/remove if /sys/bus/rbd/remove_single_major is
available will fail for backwards compatibility reasons.
Entries under /sys/bus/rbd/devices/<dev-id>/
--------------------------------------------
client_id
The ceph unique client id that was assigned for this specific session.
features
A hexadecimal encoding of the feature bits for this image.
major
The block device major number.
minor
The block device minor number. (December 2013, since 3.14.)
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.
parent
Information identifying the pool, image, and snapshot id for
the parent image in a layered rbd image (format 2 only).
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