[aklug] Raid "degraded"?

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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 06:20:37 2010