[Beowulf] Re: dedupe filesystem

Gerry Creager gerry.creager at tamu.edu
Mon Jun 29 09:57:19 EDT 2009


Dave Love wrote:
> Ashley Pittman <ashley at pittman.co.uk> writes:
> 
>> If you relied on the md5 sum alone there would be collisions and those
>> collisions would result in you losing data.
> 
> The question is whether the probability of collisions is high compared
> with other causes -- presumably hardware, assuming no-one puts figures
> on the software reliability.  As far as I remember, the calculation for
> SHA-1 for Plan 9's Venti¹, which no-one seems to have mentioned, says
> ignore collisions for petabyte filesystems.
> 
> Ob-Beowulf:  You can run Venti on GNU/Linux,² but I don't know how the
> current implementation performs.  Also, GlusterFS has a `data
> de-duplication translator' on its roadmap, which I didn't see mentioned.

Our initial results with a GlusterFS implementation led us back to NFS. 
  Who's got a really successful GlusterFS implementation working?

> --
> 1. http://plan9.bell-labs.com/sys/doc/venti/venti.html
> 2. http://swtch.com/plan9port/
> 
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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