Software RAID 1 broken, how do I fix this?

Posted by Edward on Super User See other posts from Super User or by Edward
Published on 2012-10-22T13:38:54Z Indexed on 2012/10/22 17:05 UTC
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linux

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software-raid

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raid-1

I'm running CentOS 6 x86_64. There is a software RAID 1 being used on the two internal 80GB drives. I got the following e-mail sent to me:

A DegradedArray event had been detected on md device /dev/md1.

Faithfully yours, etc.

P.S. The /proc/mdstat file currently contains the following:

Personalities : [raid1]
md0 : active raid1 sda1[0]
      511988 blocks super 1.0 [2/1] [U_]

md1 : active raid1 sda2[0]
      8190968 blocks super 1.1 [2/1] [U_]
      bitmap: 1/1 pages [4KB], 65536KB chunk

md4 : active raid1 sdc1[0] sdb1[1]
      1953512400 blocks super 1.2 [2/2] [UU]

md3 : active raid1 sdd5[1] sda5[0]
      61224892 blocks super 1.1 [2/2] [UU]
      bitmap: 1/1 pages [4KB], 65536KB chunk

md2 : active raid1 sdd3[1] sda3[0]
      8190968 blocks super 1.1 [2/2] [UU]

unused devices: <none>

The system appears to have booted fine and is working.

The two drives' content did not change at all. I only removed and reinstalled them while I was booted on the CentOS Live DVD.

How do I get the array working again?

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