[BlueOnyx:15037] Re: DegradedArray event on /dev/md0

[Chris Gebhardt - VIRTBIZ Internet]

Hi RC

On 3/28/2014 8:33 AM, RC Barker wrote:
> I have a server that rebooted yesterday then I got this email:
>
> Personalities : [raid1]
> md0 : active raid1 sda1[1]
>         256896 blocks [2/1] [_U]
>
> md1 : active raid1 sda2[1]
>         243938880 blocks [2/1] [_U]
>
> unused devices: <none>
>
> I have tried the following:
> mdadm hotadd /dev/md0 /dev/sda1
> mdadm /dev/md0 -a /dev/sda1

It already sees /dev/sda (as indicated by your /proc/mdstat printed 
above).  So more than likely you're missing /dev/sdb.

You can try adding /dev/sdb back to the RAID, but before that, I'd check 
SMART to see if it reports anything about the drive health:
smartctl -a /dev/sdb

Or maybe sdb just got knocked loose?  You could check to see if it's a 
physical issue if you don't get any output from SMART.

-- 
Chris Gebhardt
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