Bug#606389: mdadm: metadata format 00.90 unknown, ignored

[Jacob Anawalt]

Package: mdadm
Version: 2.6.7.2-3
Severity: important

I used mdadm --detail --scan >> /etc/mdadm/mdadm.conf before rebooting to
make
sure everything came back as configured. After rebooting I had two md
devices
again, but both were auto-read-only and one was pointing to an old device
that
shouldn't have been active. Every action I took with mdadm was prefixed
with:

mdadm: metadata format 00.90 unknown, ignored.
mdadm: metadata format 00.90 unknown, ignored.

After some heart pounding, hair pulling and searching (ignoring any advice
to zero the superblock) I came across a post that suggested the parsing of
metadata=00.90 was at fault. Sure enough, I changed it to metadata=0.90
and everything's good again.

http://ubuntuforums.org/showthread.php?p=6345457#post6345457

After getting this sorted out I checked around further and found that mdadm
-Ds
was the generally recommended way to add those settings, if one uses a
mdadm.conf file (bug 569359) and they format the metadata parameter with
00.90 just
like all other mdadm output, but for some reason assemble hates them. I also
noted
that the /usr/share/mdadm/mkconf tool doesn't include the metadata
parameter.

I see there is suppose to be a patch that is hopefully in the version of
mdadm
for Squeeze already.

http://neil.brown.name/git?p=mdadm;a=commit;h=d7ee65c960fa8a6886df7416307f57545ddc4460

-- Package-specific info:

-- System Information:
Debian Release: 5.0.7
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.26-2-686 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages mdadm depends on:
ii  debconf                   1.5.24         Debian configuration management
sy
ii  libc6                     2.7-18lenny6   GNU C Library: Shared libraries
ii  lsb-base                  3.2-20         Linux Standard Base 3.2 init
scrip
ii  makedev                   2.3.1-88       creates device files in /dev
ii  udev                      0.125-7+lenny3 /dev/ and hotplug management
daemo

Versions of packages mdadm recommends:
ii  module-init-tools             3.4-1      tools for managing Linux kernel
mo
ii  postfix [mail-transport-agent 2.5.5-1.1  High-performance mail transport
ag

mdadm suggests no packages.

-- debconf information:
* mdadm/autostart: true
  mdadm/mail_to: root
  mdadm/initrdstart_msg_errmd:
* mdadm/initrdstart: all
  mdadm/initrdstart_msg_errconf:
  mdadm/initrdstart_notinconf: false
  mdadm/initrdstart_msg_errexist:
  mdadm/initrdstart_msg_intro:
  mdadm/autocheck: true
  mdadm/initrdstart_msg_errblock:
  mdadm/start_daemon: true

-- 
Jacob
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