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ZFS and block deduplication

Subject: ZFS and block deduplication
From: blu-Z8efaSeK1ezqlBn2x/YWAg at public.gmane.org (Edward Ned Harvey)
Date: Mon, 25 Apr 2011 17:28:25 -0400
In-reply-to: <4DB5D60C.2010006-5a1Jt6qxUNc@public.gmane.org>
References: <4DB1A1B7.2040304@mohawksoft.com> <000101cc01b2$52b14ee0$f813eca0$@nedharvey.com> <4DB322E2.9020909@mohawksoft.com> <000001cc02f3$e206d9b0$a6148d10$@nedharvey.com> <4DB5D60C.2010006@vl.com>

> From: Tom Metro [mailto:tmetro-blu-5a1Jt6qxUNc at public.gmane.org]
> 
> (Doesn't ZFS also employ overall file hashing to insure the integrity of
> a file? (Or is that the verification option you referred to?) If so,
> then that would likely thwart this attack vector.)

The data integrity hash is something much faster and weaker.  I forget
exactly what.  

If you enable dedup, I don't know if the sha256 is used instead of, or in
addition to the data integrity hash.

References:
- ZFS and block deduplication
  - From: markw-FJ05HQ0HCKaWd6l5hS35sQ at public.gmane.org (Mark Woodward)
- ZFS and block deduplication
  - From: blu-Z8efaSeK1ezqlBn2x/YWAg at public.gmane.org (Edward Ned Harvey)
- ZFS and block deduplication
  - From: markw-FJ05HQ0HCKaWd6l5hS35sQ at public.gmane.org (Mark Woodward)
- ZFS and block deduplication
  - From: blu-Z8efaSeK1ezqlBn2x/YWAg at public.gmane.org (Edward Ned Harvey)
- ZFS and block deduplication
  - From: tmetro-blu-5a1Jt6qxUNc at public.gmane.org (Tom Metro)

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