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On Thu, 06 Jun 2002 13:25:05 +0400, Oleg Drokin said:
> But MD5 may be identical for different files.
Only a 2**128 chance of that. If you know a way to force a hash collision
more frequently than that, the crypto world wants to hear from you.. ;)
> Also this buys you nothing.
> You write file in chunks, once file is identical to other file,
> one of the files deleted. Looks like just more extra work (but some saved
space
> of course).
A much more productive way to save space is file-system compression. AIX
supports LZ-compressing each 4K block and then only saving as many 512 byte
fragments as actually needed. It's a big win - /usr (even with all the
binaries)
needs about 30% less space, and I've seen over 50% for file systems with
source trees in them...
--
Valdis Kletnieks
Computer Systems Senior Engineer
Virginia Tech
