mdadm not properly starting RAID 1 device

[Matt Adams <madams@phantomware.ca>]

Hi:

I have a RAID 1+LVM configuration on one of my 2.6 desktop machines.

I recently re-installed and discovered that, for some reason unknown to
me, mdadm is starting one of the RAID devices as "clean, degraded."

I can't for the life of me figure out how to convince mdadm to start
this RAID device properly (since there is no problem with /dev/sdb2).

If I add /dev/sdb2 to /dev/md1, the RAID is reconstructed properly,
however, if I restart the computer mdadm (or whatever) appears to forget
that the RAID device was reconstructed without error.

Please find below a printout of the RAID array.  I am hoping that this
will shed some light on why my RAID device fails to start properly.

Any thoughts or suggestions as to why I am having problems with my RAID
array would be greatly appreciated!


Thanks in advance,

Matt

BTW, I should point out that where /dev/sda and /dev/sdb appear, they
are really written as /dev/.static/dev/sda and /dev/.static/dev/sdb on
my machine.

======= Printout of RAID array /dev/md1 appears below =======

marvin:~# mdadm --detail /dev/md1
/dev/md1:
        Version : 00.90.01
  Creation Time : Thu Sep  1 01:58:33 2005
     Raid Level : raid1
     Array Size : 156151680 (148.92 GiB 159.90 GB)
    Device Size : 156151680 (148.92 GiB 159.90 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Sun Sep 18 14:10:18 2005
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           UUID : bebbd27a:23b0569f:bb2f3aa3:a847ac87
         Events : 0.1027438

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       0        0        -      removed


marvin:~# mdadm --examine /dev/sda2
/dev/sda2:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : bebbd27a:23b0569f:bb2f3aa3:a847ac87
  Creation Time : Thu Sep  1 01:58:33 2005
     Raid Level : raid1
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 1

    Update Time : Sun Sep 18 14:09:27 2005
          State : clean
 Active Devices : 1
Working Devices : 1
 Failed Devices : 1
  Spare Devices : 0
       Checksum : 7ec0af78 - correct
         Events : 0.1027364


      Number   Major   Minor   RaidDevice State
this     0       8        2        0      active sync   /dev/sda2

   0     0       8        2        0      active sync   /dev/sda2
   1     1       0        0        1      faulty removed


marvin:~# mdadm --examine /dev/sdb2
/dev/sdb2:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : bebbd27a:23b0569f:bb2f3aa3:a847ac87
  Creation Time : Thu Sep  1 01:58:33 2005
     Raid Level : raid1
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 1

    Update Time : Wed Sep  7 18:23:15 2005
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : 7ea23153 - correct
         Events : 0.495742


      Number   Major   Minor   RaidDevice State
this     1       8       18        1      active sync   /dev/sdb2

   0     0       8        2        0      active sync   /dev/sda2
   1     1       8       18        1      active sync   /dev/sdb2


marvin:~# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid5]
md0 : active raid1 sda1[0] sdb1[1]
      136448 blocks [2/2] [UU]

md1 : active raid1 sda2[0]
      156151680 blocks [2/1] [U_]

unused devices: <none>


marvin:~# cat /etc/mdadm/mdadm.conf
DEVICE partitions
ARRAY /dev/md0 level=raid1 num-devices=2 \
	UUID=bf874399:c4646ff4:0348c990:37462047 \
   	devices=/dev/sdb1,/dev/sda1
ARRAY /dev/md1 level=raid1 num-devices=2 \
	UUID=bebbd27a:23b0569f:bb2f3aa3:a847ac87 \
	devices=/dev/sdb2,/dev/sda2