On Thu, Mar 18, 2010 at 10:38:00PM -0700, Rob wrote: > Can a ZFS send stream become corrupt when piped between two hosts > across a WAN link using 'ssh'?
No. SSHv2 uses HMAC-MD5 and/or HMAC-SHA-1, depending on what gets negotiated, for integrity protection. The chances of random on the wire corruption going undetected by link-layer CRCs, TCP's CRC and SSHv2's MACs is infinitessimally small. I suspect the chances of local bit flips due to cosmic rays and what not are higher. A bigger problem is that SSHv2 connections do not survive corruption on the wire. That is, if corruption is detected then the connection gets aborted. If you were zfs send'ing 1TB across a long, narrow link and corruption hit the wire while sending the last block you'd have to re-send the whole thing (but even then such corruption would still have to get past link-layer and TCP checksums -- I've seen it happen, so it is possible, but it is also unlikely). Nico -- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
