On Mon, 13 Jul 2015 17:38:35 -0400, Selva Nair wrote:

> As with any dedup solution, performance does take a hit and its often
> not worth it unless you have a lot of duplication in the data.

This is so only in some volumes in our case, but it appears that zfs 
permits this to be enabled/disabled on a per-volume basis.  That would 
work for us.

Is there a way to save cycles by offering zfs a hint as to where a 
previous copy of a file's blocks may be found?

        - Andrew

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