[Bug 120375] Re: cannot boot raid1 with only one disk

Ace Suares ace at suares.an
Tue Aug 19 11:29:10 BST 2008


** Description changed:

+ The impact of the bug on users: Systems with root on a RAID array will
+ not be able to boot if the array is degraded. Usrs affected by this will
+ encounter an unusable system after a reboot (say, a kernel upgrade).
+ 
+ Justification for backporting the fix to the stable release: Hardy is a
+ LTS edition. It is expected that people will continue to use this
+ version and not upgrade to Intrepid. People who have upgrade from Dapper
+ LTS to Hardy LTS are affected too.
+ 
+ TEST CASE
+ Build a clean system with root on RAID, with Ubuntu 8.04 LTS. Degrade the root array. Reboot and shiver.
+ 
+ A discussion of the regression potential of the patch and how users could get inadvertently effected. 
+ - the only users that could be affected, as fas as  know, are the ones that already made a workaround and altered their system files accordingly.
+ 
+ 
  Binary package hint: mdadm
  
  if i unplug one hd from raid1 i cannot successfully boot because raid
  starts only if all disks are available through
  
  : "${MD_DEGRADED_ARGS:= --no-degraded}" in /usr/share/initramfs-
  tools/scripts/local-top/mdadm
  
  my workaround is:
  
  /etc/initramfs-tools/hooks/startdegradedraid
  
  #!/bin/sh
  #
  # Copyright <C2><A9> 2006 Martin F. Krafft <madduck at debian.org>
  # based on the scripts in the initramfs-tools package.
  # released under the terms of the Artistic Licence.
  #
  # $Id: hook 281 2006-12-08 08:14:44Z madduck $
  #
  
  set -eu
  
  PREREQ="udev"
  
  prereqs()
  {
          echo "$PREREQ"
  }
  
  case ${1:-} in
    prereqs)
      prereqs
      exit 0
      ;;
  esac
  
  MDADM=$(command -v mdadm 2>/dev/null) || :
  [ -x $MDADM ] || exit 0
  
  DESTCONFIG=$DESTDIR/conf/md.conf
  
  echo "MD_DEGRADED_ARGS=' '" >> $DESTCONFIG
  
  exit 0

-- 
cannot boot raid1 with only one disk
https://bugs.launchpad.net/bugs/120375
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