Re: raid10 redundancy

d tbsky writes:

Xiao Ni [off-list ref]

quoted

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.