On Dec 29, 2009, at 10:03 AM, Eric D. Mudama wrote: > On Tue, Dec 29 at 9:50, Richard Elling wrote: >> I don't believe compression matters. But dedup can really make a big >> difference. When you enable dedup, the deduplication table (DDT) is >> created to keep track of the references to blocks. When you remove a > > Are there any published notes on relative DDT size compared to file > count, dedup efficiency, pool size, etc. for admins to make server > capacity planning decisions?
I think it is still too early to tell. The community will need to do more experiments and share results :-) Also, the DDT is not instrumented -- quite unlike the ARC, for instance. I've been making some DTrace measurements, but am not yet ready to share any results. -- richard
