De-duping attachments

Eric Luyten Eric.Luyten at
Wed Sep 15 08:38:50 EDT 2010

On Wed, September 15, 2010 2:12 pm, Simon Matter wrote:

> You said ZFS, did you
> consider testing its built in deduping?
> (If its even there in Solaris 10?)


OpenSolaris does have it (block level dedup) since about one year
but it is too recent an addition to the commercial Solaris 10 to
start using it (IMO). Apparently (Wikipedia) it is ZFS pool feature
21 listed as 'Reserved' by 'zpool upgrade -v'
(hmmmm... both 'zfs get all ...' and 'zpool get all ...' do not
 yield a parameter sounding as 'deduplication' ; it may very well
 not be there yet)

Furthermore, I'd like to repeat what has been written earlier in
this thread : a message header that is different in size by even
one byte will cause block boundaries to shift and, I suspect, block
level dedup to fail.

Eric Luyten.

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