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. Cheers, -- Saso _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
