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This doesn't interact with resizing well, since it doesn't set the size of the device to the size at the snapshot. It's also an expensive operation to be synchronous. Rollback can still be done with the userspace rbd tool. Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>
77 lines
1.5 KiB
Plaintext
77 lines
1.5 KiB
Plaintext
What: /sys/bus/rbd/
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Date: November 2010
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Contact: Yehuda Sadeh <yehuda@newdream.net>,
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Sage Weil <sage@newdream.net>
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Description:
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Being used for adding and removing rbd block devices.
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Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name]
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$ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add
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The snapshot name can be "-" or omitted to map the image read/write. A <dev-id>
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will be assigned for any registered block device. If snapshot is used, it will
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be mapped read-only.
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Removal of a device:
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$ echo <dev-id> > /sys/bus/rbd/remove
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Entries under /sys/bus/rbd/devices/<dev-id>/
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--------------------------------------------
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client_id
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The ceph unique client id that was assigned for this specific session.
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major
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The block device major number.
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name
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The name of the rbd image.
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pool
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The pool where this rbd image resides. The pool-name pair is unique
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per rados system.
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size
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The size (in bytes) of the mapped block device.
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refresh
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Writing to this file will reread the image header data and set
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all relevant datastructures accordingly.
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current_snap
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The current snapshot for which the device is mapped.
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create_snap
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Create a snapshot:
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$ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create
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snap_*
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A directory per each snapshot
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Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
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-------------------------------------------------------------
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id
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The rados internal snapshot id assigned for this snapshot
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size
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The size of the image when this snapshot was taken.
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