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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>
This commit is contained in:
Mikulas Patocka 2015-12-02 12:32:49 -05:00 committed by Mike Snitzer
parent f6e7baadd9
commit 424da29c5a
1 changed files with 4 additions and 0 deletions
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4
Documentation/device-mapper/snapshot.txt
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@ -49,6 +49,10 @@ The difference between persistent and transient is with transient
snapshots less metadata must be saved on disk - they can be kept in
memory by the kernel.
When loading or unloading the snapshot target, the corresponding
snapshot-origin or snapshot-merge target must be suspended. A failure to
suspend the origin target could result in data corruption.
* snapshot-merge <origin> <COW device> <persistent> <chunksize>