Figured out the RAID under Linux

Good afternoon or evening dear %username%!

Had the scheme:

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 I drove the car with one drive then another, then put everything back in place. In the end we have the 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]

CHANT, and how to return back? z.s. — mdadm
October 8th 19 at 03:14
2 answers
October 8th 19 at 03:16
Solution
blog.sozinov.eu/2007/05/software-raid-1.html — in detail. 1 option Your case.
Thank you. The dock is not really my case but adaptive. Thank you everything works. - Ila.Mayert commented on October 8th 19 at 03:19
October 8th 19 at 03:18
mdadm /dev/md4 --add /dev/sda4

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