I'm testing out ceph with s3cmd (http://s3tools.org/s3cmd) and it seems to work great but I get an MD5 checksum error every time I put a file (although the file looks fine).
$ s3cmd -r -P put somefile.png s3://mybucket/public/
somefile.png -> s3://mybucket/public/somefile.png [1 of 1]
335 of 335 100% in 0s 1020.10 B/s done
WARNING: MD5 Sums don't match!
Is there any reason why the MD5 sums shouldn't match?