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SubjectRe: Transparent compression in the FS
Chris Meadors wrote:
> On Thu, 2003-10-16 at 17:02, Jeff Garzik wrote:
>>I'm curious if anyone has done any work on using multiple different
>>checksums? For example, the cost of checksumming a single block with
>>multiple algorithms (sha1+md5+crc32 for a crazy example), and storing
>>each checksum (instead of just one sha1 sum), may be faster than reading
>>the block off of disk to compare it with the incoming block. OTOH,
>>there is still a mathematical possibility (however-more-remote) of a
> I don't think multiple hashes will gain any more uniqueness over just a
> larger hash value.

I disagree...

But as long as the hash is smaller than the block
> being hashed there is the possibility of two dissimilar blocks producing
> the same hash.



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