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devmapper: document the default DM thin pool blocksize

Docker-DCO-1.1-Signed-off-by: Mike Snitzer <snitzer@redhat.com> (github: snitm)

Mike Snitzer authored on 2014/06/27 01:06:41
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@@ -128,7 +128,8 @@ Here is the list of supported options:
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  *  `dm.blocksize`
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-    Specifies a custom blocksize to use for the thin pool.
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+    Specifies a custom blocksize to use for the thin pool.  The default
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+    blocksize is 512K.
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     Example use:
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