On Mon, Oct 15, 2012 at 5:02 PM, Richard Elling < richard.ell...@richardelling.com> wrote:
> There is some interesting research that shows how scrubs for RAID-5 > systems can > contaminate otherwise good data. The reason is that if a RAID-5 parity > mismatch > occurs, how do you know where the data corruption is when the disks > themselves > do not fail. In those cases, scrubs are evil. ZFS does not suffer from > this problem because > the checksums are stored in the parent's metadata. > A similar problem happens for traditional RAID-1 mirrors. If mirror verification shows the two disks differ, there's no way of knowing which is correct. -- David Brodbeck System Administrator, Linguistics University of Washington _______________________________________________ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
