Checksumming the files on ZFS is fine, even before the fix, unless the checksum program is attempting an optimization that seems insane to me. Since the proble

Checksumming the files on ZFS is fine, even before the fix, unless the checksum program is attempting an optimization that seems insane to me. Since the problem is in the read path, having copied them off ZFS might result in them being incorrect on the destination, modulo all the caveats about this being quite rare and hard to hit unless you're very deliberately trying. You can reproduce this back on 0.6.5 and pre-OpenZFS merge FreeBSD and illumos, if you really want to.