dm snapshot: improve documentation relative to origin suspend requirements
Add a note to snapshot.txt that the origin target must be suspended when loading or unloading the snapshot target. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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@ -49,6 +49,10 @@ The difference between persistent and transient is with transient
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snapshots less metadata must be saved on disk - they can be kept in
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memory by the kernel.
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When loading or unloading the snapshot target, the corresponding
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snapshot-origin or snapshot-merge target must be suspended. A failure to
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suspend the origin target could result in data corruption.
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* snapshot-merge <origin> <COW device> <persistent> <chunksize>
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