On 07/11/2012 12:37 PM, Ferenc-Levente Juhos wrote: > Precisely, I said the same thing a few posts before: > dedup=verify solves that. And as I said, one could use dedup=<hash > algorithm>,verify with > an inferior hash algorithm (that is much faster) with the purpose of > reducing the number of dedup candidates. > For that matter one could use a trivial CRC32, if the two blocks have the > same CRC you do anyway a > byte-to-byte comparison, but if they have differenct CRC's you don't need > to do the actual comparison.
Yes, and that's exactly what the Fletcher4+verify combo does (Fletcher is faster than CRC32). That's why I started this thread - to assess whether a better hash algorithm is needed and/or desired. -- Saso _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
