that´s the point... in few words.... 2012/7/23 Drew <drew.kay@xxxxxxxxx>: > Been mulling this problem over and I keep getting hung up on one > problem with ECC on a two disk RAID1 setup. > > In the event of silent corruption of one disk, which one is the good copy? > > It works fine if the ECC code is identical across both mirrors. Just > checksum both chunks and discard the incorrect one. nice we can recover data =) > > It also works fine if the ECC codes are corrupted but the data chunks > are identical. Discard the bad checksum. nice we can recover data too =) > > What if the corruption goes across several sectors and both data & ECC > chuncks are corrupted? Now you're back to square one. report badblock to upper layer (file system or a mdraid or lvm or anyother process) the same should occur on harddisk with known corrupted data but in this case we know that´s wrong and we can report it! =) that´s the nice part! very different from "silent data corruption" where no alert or warning or error is reported, that´s the today bad part... ok... you will tell about NEC report? they have this 'software security' in firmware (i think we could make something similar) > -- > Drew > > "Nothing in life is to be feared. It is only to be understood." > --Marie Curie > -- > 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 -- Roberto Spadim Spadim Technology / SPAEmpresarial -- 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
