On Thu, 30 Sep 2010 14:03:40 -0400 Tom Keiser <[email protected]> wrote:
> RAID-5 only provides a single parity bit. Unfortunately, this means > that it can merely detect a single bit parity error; it cannot correct > the error since there is insufficient information to prove which of > the stripes is in error. RAID-6 is complicated because different > implementations use different algorithms for the two orthogonal > checksums. IIRC, all of them are able to detect two-bit errors, and > some of them can correct a single-bit error. yes, in a traditional raid5. i believe that most hardware raid5 vendors have a per disk block checksum also 'protecting' the individual data blocks on the drives. i have seen disks that have been formatted to a blocksize of 520. i gather this additional 8 bytes is to store a per block checksum. _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info
