>On Mon, Dec 14, 2009 at 09:30:29PM +0300, Andrey Kuzmin wrote:
>> ZFS deduplication is block-level, so to deduplicate one needs data
>> broken into blocks to be written. With compression enabled, you don't
>> have these until data is compressed. Looks like cycles waste indeed,
>> but ...
>
>ZFS compression is also block-level.  Both are done on ZFS blocks.  ZFS
>compression is not streamwise.


And if you enable "verify" and you checksum the uncompressed data, you 
will need to uncompress before you can verify.

Casper

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