[Beowulf] Re: dedupe filesystem
gerry.creager at tamu.edu
Mon Jun 29 06:57:19 PDT 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
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