Darren J Moffat
2007-Jan-10 16:26 UTC
[zfs-discuss] Re: [osol-discuss] Difference between ZFS checksum
Dmitry Mozheyko wrote:> Hello all. > Where i can find information about differences between fletcher2, fletcher4, and sha256 algorithms for ZFS checksums?Start here: http://en.wikipedia.org/wiki/Checksum Then read up on Fletcher here at this link http://en.wikipedia.org/wiki/Fletcher''s_checksum Then go here: http://en.wikipedia.org/wiki/Cryptographic_hash_function and finally specific information on SHA256 is here: http://en.wikipedia.org/wiki/SHA-256 As for how they are used in ZFS is it all a strength vs performance trade off. On my todo list is to actually do some benchmarking and document what the performance characteristics of each of them are, particularly the SHA256 one when there is hardware crypto support available in the CPU or an add in card. -- Darren J Moffat _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss