linux software raid

[Asif Iqbal]

Hi I just install ubuntu with software raid. I noticed during the
configure raid I saw a message that kernel does not know of md0 and I
need to reboot to fix it. I went along and finish the install. When
the system rebooted it came back with a message raid degraded.

Here is an excerpt from the dmesg

[   35.454913] md: md0: raid array is not clean -- starting background
reconstruction
[   35.565022] raid1: raid set md0 active with 1 out of 2 mirrors
[   35.579360] md: md1 stopped.
[   35.579373] md: unbind<dm-2>
[   35.597226] md: export_rdev(dm-2)
[   35.638893] md: bind<dm-2>
[   35.638911] md: md1: raid array is not clean -- starting background
reconstruction
[   35.738506] raid1: raid set md1 active with 1 out of 2 mirrors

root at host:~#  mdadm --query --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Tue Mar  3 14:38:40 2009
     Raid Level : raid1
     Array Size : 74918976 (71.45 GiB 76.72 GB)
  Used Dev Size : 74918976 (71.45 GiB 76.72 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Tue Mar  3 15:31:42 2009
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           UUID : 111256f9:cad06de4:2c5872f0:3d319ab8
         Events : 0.126

    Number   Major   Minor   RaidDevice State
       0     254        1        0      active sync   /dev/block/254:1
       1       0        0        1      removed

root at host:~# ls -al /dev/block/254\:1
lrwxrwxrwx 1 root root 26 2009-03-03 15:10 /dev/block/254:1 ->
../mapper/nvidia_eeffhbef1

I have two disks and I setup md0 raid1 out of sda1 and sbd1 and mount
as / and md1 raid1 swap device
out of sda5 and sdb5
root at ftp0:~# fdisk -l

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xffffffff

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        9327    74919096   fd  Linux raid autodetect
/dev/sda2            9328        9729     3229065    5  Extended
/dev/sda5            9328        9729     3229033+  fd  Linux raid autodetect

Disk /dev/sdb: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xffffffff

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1        9327    74919096   fd  Linux raid autodetect
/dev/sdb2            9328        9729     3229065    5  Extended
/dev/sdb5            9328        9729     3229033+  fd  Linux raid autodetect

How do I fix the degraded raid?


-- 
Asif Iqbal
PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?