[Bug 776422] Re: [Natty] Grub no longer recognizes raid5 array

Sat Aug 11 09:00:29 UTC 2012

I can confirm this bug for Oneric. I've added a new 6th disk to md raid5
(grew it), several days later I've uprgaded the kernel (apt-get dist-
upgrade), system was not rebooted between these two events. When grub
was configured for a new kernel numerous "error: found two disks with
the index 5 for RAID md1. " messages were diplayed (full
/var/apt/term.log below). System functions properly after the reboot.

root at server:/var/log/apt# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10] 
md1 : active raid5 sdg1[1] sdf1[4] sde1[2] sdc1[0] sdd1[3] sda1[5]
      9767559680 blocks level 5, 64k chunk, algorithm 2 [6/6] [UUUUUU]

>sda is the new disk.

unused devices: <none>

root at server:/var/log/apt# uname -a
Linux server 3.0.0-24-generic-pae #40-Ubuntu SMP Tue Jul 24 15:55:26 UTC 2012 i686 athlon i386 GNU/Linux

Log started: 2012-08-11  10:25:15
Selecting previously deselected package linux-image-3.0.0-24-generic-pae.
(Reading database ... 252585 files and directories currently installed.)
Unpacking linux-image-3.0.0-24-generic-pae (from .../linux-image-3.0.0-24-generic-pae_3.0.0-24.40_i386.deb) ...
Done.
Preparing to replace linux-generic-pae 3.0.0.23.27 (using .../linux-generic-pae_3.0.0.24.28_i386.deb) ...
Unpacking replacement linux-generic-pae ...
Preparing to replace linux-image-generic-pae 3.0.0.23.27 (using .../linux-image-generic-pae_3.0.0.24.28_i386.deb) ...
Unpacking replacement linux-image-generic-pae ...
Selecting previously deselected package linux-headers-3.0.0-24.
Unpacking linux-headers-3.0.0-24 (from .../linux-headers-3.0.0-24_3.0.0-24.40_all.deb) ...
Selecting previously deselected package linux-headers-3.0.0-24-generic-pae.
Unpacking linux-headers-3.0.0-24-generic-pae (from .../linux-headers-3.0.0-24-generic-pae_3.0.0-24.40_i386.deb) ...
Preparing to replace linux-headers-generic-pae 3.0.0.23.27 (using .../linux-headers-generic-pae_3.0.0.24.28_i386.deb) ...
Unpacking replacement linux-headers-generic-pae ...
Setting up linux-image-3.0.0-24-generic-pae (3.0.0-24.40) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/dkms 3.0.0-24-generic-pae /boot/vmlinuz-3.0.0-24-generic-pae
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.0.0-24-generic-pae /boot/vmlinuz-3.0.0-24-generic-pae
update-initramfs: Generating /boot/initrd.img-3.0.0-24-generic-pae
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.0.0-24-generic-pae /boot/vmlinuz-3.0.0-24-generic-pae
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.0.0-24-generic-pae /boot/vmlinuz-3.0.0-24-generic-pae
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.0.0-24-generic-pae /boot/vmlinuz-3.0.0-24-generic-pae
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
Generating grub.cfg ...
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
Found linux image: /boot/vmlinuz-3.0.0-24-generic-pae
Found initrd image: /boot/initrd.img-3.0.0-24-generic-pae
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
Found linux image: /boot/vmlinuz-3.0.0-23-generic-pae
Found initrd image: /boot/initrd.img-3.0.0-23-generic-pae
Found linux image: /boot/vmlinuz-3.0.0-22-generic-pae
Found initrd image: /boot/initrd.img-3.0.0-22-generic-pae
Found linux image: /boot/vmlinuz-3.0.0-21-generic-pae
Found initrd image: /boot/initrd.img-3.0.0-21-generic-pae
Found linux image: /boot/vmlinuz-2.6.38-11-generic-pae
Found initrd image: /boot/initrd.img-2.6.38-11-generic-pae
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
error: found two disks with the index 5 for RAID md1.
Found memtest86+ image: /memtest86+.bin
done
Setting up linux-image-generic-pae (3.0.0.24.28) ...
Setting up linux-generic-pae (3.0.0.24.28) ...
Setting up linux-headers-3.0.0-24 (3.0.0-24.40) ...
Setting up linux-headers-3.0.0-24-generic-pae (3.0.0-24.40) ...
Examining /etc/kernel/header_postinst.d.
run-parts: executing /etc/kernel/header_postinst.d/dkms 3.0.0-24-generic-pae /boot/vmlinuz-3.0.0-24-generic-pae
Setting up linux-headers-generic-pae (3.0.0.24.28) ...
Log ended: 2012-08-11  10:26:39

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https://bugs.launchpad.net/bugs/776422

Title:
  [Natty] Grub no longer recognizes raid5 array

Status in “grub2” package in Ubuntu:
  Opinion

Bug description:
  Binary package hint: grub2

  After upgrading from Maverick to Natty, grub drops to the rescue shell
  complaining about the raid5 array.  It says:

  error: Found two disks with the index 0 for RAID md0
  error: Found two disks with the index 1 for RAID md0
  error: Found two disks with the index 2 for RAID md0
  error: Superfluous RAID member (4 found)
  error: Unknown filesystem

  This is a 4 disk raid5 array that mdadm still recognizes and looks
  fine, with each disk having IDs 0 through 3 respectively.  Despite the
  fact that it complains about the raid, it still shows the LVM logical
  volumes in the output of ls.  The array is the sole LVM PV.

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