[UU_U] in software raid

  • The [UU] indicates the health of the RAID. Each U corresponds to a constituent device of the RAID. Failed, offline, or missing devices would be indicated with an underscore, as in [U_] or [_U].

How to Fix it.

=====================

 mdadm –detail /dev/md0

(The above command shows the error)

Example:

0 8 1 0 active sync /dev/sda1

1 8 17 1 active sync /dev/sdb1

2 0 0 2 removed

3 8 49 3 active sync /dev/sdd1

==

To Fix the error

/sbin/mdadm /dev/md0 –fail /dev/sdc1 –remove /dev/sdc1
/sbin/mdadm /dev/md0 –add /dev/sdc1

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