On Sep 30, 2008, at 19:44, Miles Nordin wrote: > There are checksums in the ethernet FCS, checksums in IP headers, > checksums in UDP headers (which are sometimes ignored), and checksums > in TCP (which are not ignored). There might be an RPC layer checksum, > too, not sure.
Not of which helped Amazon when their S3 service went down due to a flipped bit: > More specifically, we found that there were a handful of messages on > Sunday morning that had a single bit corrupted such that the message > was still intelligible, but the system state information was > incorrect. We use MD5 checksums throughout the system, for example, > to prevent, detect, and recover from corruption that can occur > during receipt, storage, and retrieval of customers' objects. > However, we didn't have the same protection in place to detect > whether this particular internal state information had been corrupted. http://status.aws.amazon.com/s3-20080720.html _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
