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Merge pull request #6908 from nilamdyuti/wip-doc-rbdsnapshot

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doc: Modified a note section in rbd-snapshot doc.

Reviewed-by: Loic Dachary <ldachary@redhat.com>
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Loic Dachary 2015-12-13 02:10:12 +01:00
commit cd4b4cf4f8
1 changed files with 8 additions and 3 deletions
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doc/rbd/rbd-snapshot.rst
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@ -14,9 +14,14 @@ command and many higher level interfaces, including `QEMU`_, `libvirt`_,
.. important:: To use use RBD snapshots, you must have a running Ceph cluster.
.. note:: **STOP I/O BEFORE** snapshotting an image.
If the image contains a filesystem, the filesystem must be in a
consistent state **BEFORE** snapshotting.
.. note:: If a snapshot is taken while `I/O` is still in progress in a image, the
snapshot might not get the exact or latest data of the image and the snapshot
may have to be cloned to a new image to be mountable. So, we recommend to stop
`I/O` before taking a snapshot of an image. If the image contains a filesystem,
the filesystem must be in a consistent state before taking a snapshot. To stop
`I/O` you can use `fsfreeze` command. See `fsfreeze(8)` man page for more details.
For virtual machines, `qemu-guest-agent` can be used to automatically freeze
filesystems when creating a snapshot.
.. ditaa:: +------------+ +-------------+
| {s} | | {s} c999 |