Robert Milkowski wrote:
While lsize is the same for both files asize is smaller fr the second
one. Why is it? When is is possible? Both file systems have
compression turned off and default recordsize. Diff claims both files
to be the same.
Metadata (eg, "DMU dnode", and indirect blocks for "ZFS plain file",
which you can see broken out by using more -b's) is always compressed.
Because the metadata is necessarily different (there are different block
pointers, also the object numbers could be allocated differently, though
not in your situation), it can compress different amounts.
So, this is always possible, and in fact likely.
--matt
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