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
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