On Fri, Feb 23, 2007 at 05:37:23PM -0700, Andreas Dilger wrote: > > Probably the only sane thing to do is to remember the bad sectors and > > avoid attempting reading them; that would mean marking "automatic" > > versus "explicitly requested" requests to determine whether or not to > > filter them against a list of discovered bad blocks. > > And clearing this list when the sector is overwritten, as it will almost > certainly be relocated at the disk level. For that matter, a huge win > would be to have the MD RAID layer rewrite only the bad sector (in hopes > of the disk relocating it) instead of failing the whiole disk. Otherwise, > a few read errors on different disks in a RAID set can take the whole > system offline. Apologies if this is already done in recent kernels... And having a way of making this list available to both the filesystem and to a userspace utility, so they can more easily deal with doing a forced rewrite of the bad sector, after determining which file is involved and perhaps doing something intelligent (up to and including automatically requesting a backup system to fetch a backup version of the file, and if it can be determined that the file shouldn't have been changed since the last backup, automatically fixing up the corrupted data block :-). - Ted - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
