Hello Ric,
> (1) Block level or file level dedup?
what is the difference between the two?
> (2) Inband dedup (during a write) or background dedup?
I think inband dedup is way to intensive on ressources (memory) and also
would kill every performance benchmark. So I think the offline dedup is
the right way to go.
> (3) How reliably can you protect the pool of blocks? How reliably can
> you protect the database that maps hashes to blocks?
You have to lock down the i/o requests for the blocks in question and
compare them byte by byte anyway, just to make sure.
> (4) Can you give users who are somewhat jaded confidence in your
> solution (this is where stats come in very handy!)
For virtual machines you can reduce the used data by 1/3. Of course it
can blow in your face when you don't watch your physical resources
closely.
Thomas
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