On Wed, 18 Jul 2012 07:01:48 -0400 (EDT) Jaromir Capik <jcapik@xxxxxxxxxx> 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. If a drive ever lets you read incorrect data rather than giving you an error indication, then the drive is broken by design. Don't use drives that do that. > Would it be possible > to implement chunk checksums to avoid such data corruptions? No. NeilBrown > 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. > > Thanks in advance. > > Regards, > Jaromir. > > -- > Jaromir Capik > Red Hat Czech, s.r.o. > Software Engineer / BaseOS > > Email: jcapik@xxxxxxxxxx > Web: www.cz.redhat.com > Red Hat Czech s.r.o., Purkynova 99/71, 612 45, Brno, Czech Republic > IC: 27690016 > > > -- > 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
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