| 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. | |