2 ms·
RAID5 corruption is non-recoverable - you can't tell which is right, the data or the parity. RAID6 is recoverable - you can get consensus between the data and t
by ilikejam 7y ago
RAID5 corruption is non-recoverable - you can't tell which is right, the data or the parity.
RAID6 is recoverable - you can get consensus between the data and the two parity bits.
ZFS stores hashes of each block, so as long as you have two copies, you can just pick the data+hash that's correct and restore the corrupt block, even with only two copies of the data.