On Sep 6, 2011, at 9:01 PM, Freddie Cash wrote: > Just curious if anyone has looked into the relationship between zpool dedupe, > zfs zend dedupe, memory use, and network throughput. >
Yes. > For example, does 'zfs send -D' use the same DDT as the pool? > No. > Or does it require more memory for it's own DDT, thus impacting performance > of both? > Yes, no. > If you have a deduped pool on both ends of the send, does -D make any > difference? > Yes, if the data is deduplicable. > If neither pool is deduped, does -D make a difference? > Yes, if the data is deduplicable. > We're waiting on a replacement backplane for our newest zfs-based storage > box, so won't be able to look into this ourselves until next week at the > earliest. Thought i'd check if anyone else has already done some comparisons > or benchmarks. > I'm not aware of any benchmarks, and I'd be surprised if they could be applied to real-world cases. zfs send deduplication is very, very, very dependent on the data being sent. It is also dependent on the release, since it is broken in many OpenSolaris and derived builds. Fixes have recently been submitted into the illumos source tree. Recent Nexenta distributions also have the fixes. -- richard
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