On 15/08/18 10:22, Danil Kipnis wrote: > I had the naive understanding, that with raid5 one chunk goes to one > drive, another - to the second and the XOR of them - to the third. > Does it mean, with two drives, a chunk and a XOR have to go to the > same drive? Don't mind, I should read the code, I know. This is actually how you convert between different raid types. It's strange, but parity for a single drive is just a copy of that drive ... :-) And it's why, iirc, you can't go directly from raid-6 to most anything else. You have to convert it to raid 5 and go from there ... Cheers, Wol