[CentOS] DegradedArray message

[Fred Smith]

On Tue, Dec 02, 2014 at 08:14:19PM -0500, David McGuffey wrote:
> Received the following message in mail to root:
> 
> Message 257:
> >From root at desk4.localdomain  Tue Oct 28 07:25:37 2014
> Return-Path: <root at desk4.localdomain>
> X-Original-To: root
> Delivered-To: root at desk4.localdomain
> From: mdadm monitoring <root at desk4.localdomain>
> To: root at desk4.localdomain
> Subject: DegradedArray event on /dev/md0:desk4
> Date: Tue, 28 Oct 2014 07:25:27 -0400 (EDT)
> Status: RO
> 
> This is an automatically generated mail message from mdadm
> running on desk4
> 
> A DegradedArray event had been detected on md device /dev/md0.
> 
> Faithfully yours, etc.
> 
> P.S. The /proc/mdstat file currently contains the following:
> 
> Personalities : [raid1] 
> md0 : active raid1 dm-2[1]
>       243682172 blocks super 1.1 [2/1] [_U]
>       bitmap: 2/2 pages [8KB], 65536KB chunk
> 
> md1 : active raid1 dm-3[0] dm-0[1]
>       1953510268 blocks super 1.1 [2/2] [UU]
>       bitmap: 3/15 pages [12KB], 65536KB chunk
> 
> unused devices: <none>

Could be a bad drive, as digimer alludes in his reply.

OTOH, I had a perfectly good drive get kicked out of my RAID-1
array a fewyears ago just because, well, I guess I could say
"it felt like it".

In reality, I had (in my ignorance) purchased a pair of WD
drives that aren't intended to be used in a RAID array, and
once in a long while (that was actually the only such instance
in the 4-5 years I've had that RAID array) it doesn't respond to
some HD command or other and gets dropped.

turned out to be easy to reinsert it and it ran for a long
time thereafter without trouble.

I can dig for the info on the drives and the nature of the
problem if anyone wants to see it.

Fred

<huge snippage>

-- 
---- Fred Smith -- fredex at fcshome.stoneham.ma.us -----------------------------
                        The Lord is like a strong tower. 
             Those who do what is right can run to him for safety.
--------------------------- Proverbs 18:10 (niv) -----------------------------