| What: /sys/bus/rbd/ |
| Date: November 2010 |
| Contact: Yehuda Sadeh <yehuda@hq.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. |
| |
| 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 <snap-name> > /sys/bus/rbd/devices/<dev-id>/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 <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_rollback |
| |
| snap_* |
| |
| A directory per each snapshot |
| |
| |
| Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name> |
| ------------------------------------------------------------- |
| |
| id |
| |
| The rados internal snapshot id assigned for this snapshot |
| |
| size |
| |
| The size of the image when this snapshot was taken. |
| |
| |
