On Wed, Jul 18, 2012 at 07:01:48AM -0400, Jaromir Capik wrote: > Hello. > > I'd like to ask you to implement the following ... > > The current RAID1 solution is not robust enough to protect the data > against random data corruptions. Such corruptions usually happen > when an unreadable sector is found by the drive's electronics > and when the drive's trying to reallocate the sector to the spare area. > There's no guarantee that the reallocated data will always match > the original stored data since the drive sometimes can't read the data > correctly even with several retries. That unfortunately completely masks > the issue, because the sector can be read by the OS without problems > even if it doesn't contain correct data. Would it be possible > to implement chunk checksums to avoid such data corruptions? > If a corrupted chunk is encountered, it would be taken from the second > drive and immediately synced back. This would have a small performance > and capacity impact (1 sector per chunk to minimize performance impact > caused by unaligned granularity = 0.78% of the capacity with 64k chunks). > > Please, let me know if you find my request reasonable or not. I believe alternative to that is implemented via the Linux RAID MD badblock feature. best regards keld -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
