On 08/01/2012 03:35 PM, opensolarisisdeadlongliveopensolaris wrote:
>> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
>> boun...@opensolaris.org] On Behalf Of Jim Klimov
>> Availability of the DDT is IMHO crucial to a deduped pool, so
>> I won't be surprised to see it forced to triple copies. 
> IMHO, the more important thing for dedup moving forward is to create an 
> option to dedicate a fast device (SSD or whatever) to the DDT.  So all those 
> little random IO operations never hit the rusty side of the pool.

That's something you can already do with an L2ARC. In the future I plan
on investigating implementing a set of more fine-grained ARC and L2ARC
policy tuning parameters that would give more control into the hands of
admins over how the ARC/L2ARC cache is used.

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