On Thu, 15 Dec 2011 11:15:42 +0800 Tao Guo <glorioustao@xxxxxxxxx> wrote: > Hi all, > > Today I checked the raid6's scribbling code, and I think there may be > some improvements to handle bad sectors: I think the common term is "scrubbing" rather than "scribbling". > > If we have one bad sector(with corrupted data) in the data block, > scribbling thread will find parity mismatch and will try to > recompute&rewrite P&Q, but that will cause final data loss. > Since we have P & Q, actually we can try to use them and find out the > wrong data block then fix it. > > But the algorithm to find the bad data block seems not > straightforward... Does anyone know if there is any paper discussed > this issue before? > > Update: I just found there is one talk about this in FAST08: > http://www.usenix.org/events/fast08/tech/krioukov.html. > But that approach will add checksums.etc. For bare-bones raid6, does > any guru have any better ideas? http://neil.brown.name/blog/20100211050355 NeilBrown
Attachment:
signature.asc
Description: PGP signature
