d tbsky writes: > Xiao Ni <xni@xxxxxxxxxx> >> >> Hi >> >> It depends on which layout do you use and the copies you specify. There >> is a detailed description in `man md 3` No, it only depends on the number of copies. They layout just effects the performance. > Thanks a lot for the hint. After studying the pattern I think n2 and > o2 could survive if losing two correct disks with 4 or 5 disks. but f2 > will be dead. is my understanding correct? No; 2 copies means you can lose one disk and still have the other copy. Where those copies are stored doesn't matter for redundancy, only performance.
