I figured out the raid under Linux

Question

linux

Good afternoon or evening, dear% username%!

Had a schema:

md1: active raid1 sdb1[1] sda1[0]
488384 blocks [2/2] [UU]

md3: active raid1 sdb3[1] sda3[0]
9765824 blocks [2/2] [UU]

md4: active raid1 sdb4[1] sda4[0]
468365248 blocks [2/2] [UU]

And after that I drove the car with one disk, then with another, after that I put everything in place. As a result, I have a decompression:

md3: active raid1 sda3[0]
9765824 blocks [2/1] [U_]

md126: active raid1 sda4[0]
468365248 blocks [2/1] [U_]

md1: active raid1 sdb1[1] sda1 [0]
488384 blocks [2/2] [UU]

md127: active raid1 sdb3[1]
9765824 blocks [2/1] [_U]

md4: active raid1 sdb4[1]
468365248 blocks [2/1] [_U]

CHYADNT, and how to get it back? ps — mdadm

Answer 1

blog.sozinov.eu/2007/05/software-raid-1.html - in detail. Option 1 is your case.

Answer 2

mdadm /dev/md4 --add /dev/sda4