Re: announcement of deduplication in Sun ZFS

[Chris Samuel <chris@csamuel.org>]

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On Tue, 3 Nov 2009 07:51:52 am Alex Dedul wrote:

> In any way thats a nice and interesting feature, thanks! :)

My concern would be that it increases the impact of a corruption of the block 
that has been de-dup'd - in other words if the block that now represents the 
same data in lots of files gets trashed then all those files have corrupt 
data. This implies that you would want to keep around at least one other copy 
of that data to be resilient in the face of corruption (checksums will let you 
detect it, but not necessarily recover from it without duplicate copies).

Given that ZFS prides itself on detecting errors it would be strange if they 
hadn't considered this in the implementation but I couldn't see any mention of 
it.  

cheers,
Chris
-- 
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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