Bug#559390: mdadm: checkarray -s gives no warning of a degraded array

[Ross Boylan]

Package: mdadm
Version: 2.6.7.2-3
Severity: normal

The misbehavior occurred on a system different from the one being used
to file this report.  The actual system had a 2.6.30-2-amd64 kernel
(stock debian).

md1 looked like this:
/dev/md1:
        Version : 00.90
  Creation Time : Mon Dec 15 06:50:18 2008
     Raid Level : raid1
     Array Size : 730523648 (696.68 GiB 748.06 GB)
  Used Dev Size : 730523648 (696.68 GiB 748.06 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Thu Dec  3 16:12:41 2009
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           UUID : b77027df:d6aa474a:2a09e10c:740d4ffc
         Events : 0.30940

    Number   Major   Minor   RaidDevice State
       0       0        0        0      removed
       1       8       19        1      active sync   /dev/sdb3

checkarray, or rather its log output, did not indicate there was any
problem with md1.

Expected result: a log message like "md1 is degraded".

I also expected that the system would automatically recover the
missing device.  I don't know if that is the intended behavior.

The reasons the device got separated are murky, but there appears to
have been a hardware problem.  Also, the removal of the missing part
happened during an usuccessful reboot; because the root device
changed, the root partition was never mounted.

Details of the setup.
8 core system with 2 identical SATA disks.
md0 is made from sda1 and sdb1.
md1 is made from sda3 and sdb3.
sda3 is the part that got kicked out.

I am currently running
 mdadm /dev/md1 --re-add /dev/sda3
which appears to be recovering the lost partition.

-- System Information:
Debian Release: 5.0.3
  APT prefers stable
  APT policy: (500, 'stable'), (50, 'unstable'), (40, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 2.6.26-2-686 (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash

Versions of packages mdadm depends on:
ii  debconf                       1.5.24     Debian configuration management sy
ii  libc6                         2.7-18     GNU C Library: Shared libraries
ii  makedev                       2.3.1-88   creates device files in /dev

mdadm recommends no packages.

mdadm suggests no packages.