On Monday June 22, gnu@xxxxxxx wrote: > what happens in the case of a single unrecoverable bit error when resyncing a > raid5 or upgrading it? During resync, a read error will cause the drive to fail and the resync to abort. So you get a degraded array. On the next restart, you will need to --force assemble the array because it will appear not to be 'clean'. What exactly do you mean by "uprade". > > and in the case of raid6? The same. > > would raid6 only be able to survive 2 bit errors? I don't understand why you are focussing on 'bit' error. raid deals with whole blocks, which either succeed or fail. During resync you cannot trust the parity, so any read error means lost data. During recovery (to a hot spare) for a partially degraded raid6, the correct data will be generated from the remaining good drives and written out. NeilBrown > > couldn't really find any information on it in the docs or google, but I have > heard about systems failing because of single bit errors. > > /Michael Ole Olsen -- 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
