On Tuesday March 22, Thomas.Schuett.extern@xxxxxxxxxxxxxxx wrote: > >Neil Brown wrote: > >>> Is there any way to tell MD to [...] and > >>> read-from-all-disks on a RAID1 array? > > > >Not sure why a checksum of X data blocks should be cheaper > >performance-wise than a comparison between X data blocks, but I can > >see the point in that you only have to load the data once and check > >the checksum. Not quite the same security, but almost. > > Still, if there is different data on the two disks due to a previous > power failure, the comparsion could really be the better choise, isn't it? > What does a comparison of two blocks tell you? That they are different, not which one is "right". A filesystem designed to handle these sort of problems wouldn't suffer from data inconsistencies due to power off. It would "know" where it was up to and would either re-write or ignore any data that it doesn't know to certainly be safe. NeilBrown - 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
