[PATCH] Fix dm-snapshot tutorial in Documentation
I've recently added this documentation, Alasdair gave some corrections, and here are some further corrections on top of his work (partly style issue, partly a technical error due to different past experience, partly a note which I've added - i.e. transient snapshots are lighter). Cc: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -19,7 +19,6 @@ There are two dm targets available: snapshot and snapshot-origin.
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*) snapshot-origin <origin>
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which will normally have one or more snapshots based on it.
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You must create the snapshot-origin device before you can create snapshots.
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Reads will be mapped directly to the backing device. For each write, the
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original data will be saved in the <COW device> of each snapshot to keep
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its visible content unchanged, at least until the <COW device> fills up.
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@ -27,7 +26,7 @@ its visible content unchanged, at least until the <COW device> fills up.
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*) snapshot <origin> <COW device> <persistent?> <chunksize>
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A snapshot is created of the <origin> block device. Changed chunks of
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A snapshot of the <origin> block device is created. Changed chunks of
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<chunksize> sectors will be stored on the <COW device>. Writes will
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only go to the <COW device>. Reads will come from the <COW device> or
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from <origin> for unchanged data. <COW device> will often be
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@ -37,6 +36,8 @@ the amount of free space and expand the <COW device> before it fills up.
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<persistent?> is P (Persistent) or N (Not persistent - will not survive
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after reboot).
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The difference is that for transient snapshots less metadata must be
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saved on disk - they can be kept in memory by the kernel.
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How this is used by LVM2
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