| Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame^] | 1 | What: /sys/bus/rbd/ |
| 2 | Date: November 2010 |
| 3 | Contact: Yehuda Sadeh <yehuda@hq.newdream.net>, |
| 4 | Sage Weil <sage@newdream.net> |
| 5 | Description: |
| 6 | |
| 7 | Being used for adding and removing rbd block devices. |
| 8 | |
| 9 | Usage: <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 | |
| 13 | The snapshot name can be "-" or omitted to map the image read/write. A <dev-id> |
| 14 | will be assigned for any registered block device. If snapshot is used, it will |
| 15 | be mapped read-only. |
| 16 | |
| 17 | Removal of a device: |
| 18 | |
| 19 | $ echo <dev-id> > /sys/bus/rbd/remove |
| 20 | |
| 21 | Entries under /sys/bus/rbd/devices/<dev-id>/ |
| 22 | -------------------------------------------- |
| 23 | |
| 24 | client_id |
| 25 | |
| 26 | The ceph unique client id that was assigned for this specific session. |
| 27 | |
| 28 | major |
| 29 | |
| 30 | The block device major number. |
| 31 | |
| 32 | name |
| 33 | |
| 34 | The name of the rbd image. |
| 35 | |
| 36 | pool |
| 37 | |
| 38 | The pool where this rbd image resides. The pool-name pair is unique |
| 39 | per rados system. |
| 40 | |
| 41 | size |
| 42 | |
| 43 | The size (in bytes) of the mapped block device. |
| 44 | |
| 45 | refresh |
| 46 | |
| 47 | Writing to this file will reread the image header data and set |
| 48 | all relevant datastructures accordingly. |
| 49 | |
| 50 | current_snap |
| 51 | |
| 52 | The current snapshot for which the device is mapped. |
| 53 | |
| 54 | create_snap |
| 55 | |
| 56 | Create a snapshot: |
| 57 | |
| 58 | $ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create |
| 59 | |
| 60 | rollback_snap |
| 61 | |
| 62 | Rolls back data to the specified snapshot. This goes over the entire |
| 63 | list of rados blocks and sends a rollback command to each. |
| 64 | |
| 65 | $ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_rollback |
| 66 | |
| 67 | snap_* |
| 68 | |
| 69 | A directory per each snapshot |
| 70 | |
| 71 | |
| 72 | Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name> |
| 73 | ------------------------------------------------------------- |
| 74 | |
| 75 | id |
| 76 | |
| 77 | The rados internal snapshot id assigned for this snapshot |
| 78 | |
| 79 | size |
| 80 | |
| 81 | The size of the image when this snapshot was taken. |
| 82 | |
| 83 | |