[aklug] Re: Raid "degraded"?

Follow Arthurs instructions. Here's where I add my 2 cents. Even if
you can add it back I would replace the drive. I don't know why but
RAID seems to be picky about drives. If it kicked it out there might
be a good reason it did so.

You could run it until it kicks it out a second time. Assuming you
even get to add it back.

Maybe someone else with more knowledge can explain why RAID is picky.
Just something I've noticed.

Sent from my iPhone

On Oct 8, 2010, at 6:20 AM, Christopher Howard <choward@indicium.us> wrote:

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> My main desktop at home has a RAID-1 software array (two 500GB drives).
> I restarted the system and booted into the kernel, but when it tried to
> read the root file system (I have xfs on top of lvm on top of Luks on
> top of RAID 1) I got a disk-read error.
>
> This morning, I had no trouble booting into the system. So my prime
> suspect is one of my drives is failing. I have two RAID devices on the
> system, actually (one for boot, one with encryption). Here's the info I
> see on them:
>
> cat /proc/mdstat
> Personalities : [raid1] [multipath] [raid0] [raid6] [raid5] [raid4]
> [raid10]
> md0 : active raid1 sdb1[1]
> 9767424 blocks [2/1] [_U]
>
> md1 : active raid1 sdb5[1]
> 477540032 blocks [2/1] [_U]
>
> unused devices: <none>
>
> mdadm --detail /dev/md0
> /dev/md0:
> Version : 0.90
> Creation Time : Sat Apr 11 12:56:34 2009
> Raid Level : raid1
> Array Size : 9767424 (9.31 GiB 10.00 GB)
> Used Dev Size : 9767424 (9.31 GiB 10.00 GB)
> Raid Devices : 2
> Total Devices : 1
> Preferred Minor : 0
> Persistence : Superblock is persistent
>
> Update Time : Fri Oct 8 06:12:28 2010
> State : clean, degraded
> Active Devices : 1
> Working Devices : 1
> Failed Devices : 0
> Spare Devices : 0
>
> UUID : 57f2c75f:18ce0a9a:e1f12d88:5b3d3652
> Events : 0.76
>
> Number Major Minor RaidDevice State
> 0 0 0 0 removed
> 1 8 17 1 active sync /dev/sdb1
>
> mdadm --detail /dev/md1
> /dev/md1:
> Version : 0.90
> Creation Time : Sat Apr 11 12:56:46 2009
> Raid Level : raid1
> Array Size : 477540032 (455.42 GiB 489.00 GB)
> Used Dev Size : 477540032 (455.42 GiB 489.00 GB)
> Raid Devices : 2
> Total Devices : 1
> Preferred Minor : 1
> Persistence : Superblock is persistent
>
> Update Time : Fri Oct 8 06:12:29 2010
> State : clean, degraded
> Active Devices : 1
> Working Devices : 1
> Failed Devices : 0
> Spare Devices : 0
>
> UUID : e4f7f201:b58ba33c:ad7db351:0882a0f8
> Events : 0.2215328
>
> Number Major Minor RaidDevice State
> 0 0 0 0 removed
> 1 8 21 1 active sync /dev/sdb5
>
> I don't see a "Failed Device", but it says that the state is "degraded".
> What does this mean?
>
> - --
> Christopher Howard
> frigidcode.com
> theologia.indicium.us
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Received on Fri Oct 8 10:37:18 2010