On 07/11/2012 11:53 AM, Tomas Forsman wrote:
> On 11 July, 2012 - Sa??o Kiselkov sent me these 1,4K bytes:
>> Oh jeez, I can't remember how many times this flame war has been going
>> on on this list. Here's the gist: SHA-256 (or any good hash) produces a
>> near uniform random distribution of output. Thus, the chances of getting
>> a random hash collision are around 2^-256 or around 10^-77. If I asked
>> you to pick two atoms at random *from the entire observable universe*,
>> your chances of hitting on the same atom are higher than the chances of
>> that hash collision. So leave dedup=on with sha256 and move on.
> So in ZFS, which normally uses 128kB blocks, you can instead store them
> 100% uniquely into 32 bytes.. A nice 4096x compression rate..
> decompression is a bit slower though..
I really mean no disrespect, but this comment is so dumb I could swear
my IQ dropped by a few tenths of a point just by reading.
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