[Bug 396564] Re: grub2 shows 'biosdisk read error', then boots

[Al Grabauskas]

i can confirm this on a clean install from karmic stable. it was also
present in an upgrade from jaunty on the same machine.

my situation is two partitions per drive (4 drives) - the first
partition(s) are /boot and are raid1, and the other partition(s) are a
raid5 lvm volume group.

it's not a problem - the system boots just fine after a delay waiting
for that message.

some data on the disk layout - /dev/md0 is the /boot raid1:

------------------------------
### BEGIN /etc/grub.d/10_linux ###
menuentry "Ubuntu, Linux 2.6.31-14-generic" {
        recordfail=1
        if [ -n ${have_grubenv} ]; then save_env recordfail; fi
        set quiet=1
        insmod raid
        insmod mdraid
        insmod ext2
        set root=(md0)
        search --no-floppy --fs-uuid --set 41a623ac-fd6d-428d-abc9-472bd6caf9dd
        linux   /vmlinuz-2.6.31-14-generic root=/dev/mapper/vger2-sys ro   quiet splash
        initrd  /initrd.img-2.6.31-14-generic
}
------------------------------

root at vger:~# cat /proc/mdstat 
Personalities : [raid6] [raid5] [raid4] [raid1] [linear] [multipath] [raid0] [raid10] 
md1 : active raid5 sdd2[3] sdc2[1] sda2[2] sdb2[0]                                    
      1464260160 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]                  
                                                                                      
md0 : active raid1 sdb1[0] sdd1[3] sdc1[1] sda1[2]                                    
      297088 blocks [4/4] [UUUU]                                                      
                                                                                      
unused devices: <none>                                                                
root at vger:~# fdisk -l                                                                 

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xda56cdd4

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          37      297171   fd  Linux raid autodetect
/dev/sda2              38       60801   488086830   fd  Linux raid autodetect

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000bad08

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1          37      297171   fd  Linux raid autodetect
/dev/sdb2              38       60801   488086830   fd  Linux raid autodetect

Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xa5357bed

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *           1          37      297171   fd  Linux raid autodetect
/dev/sdc2              38       60801   488086830   fd  Linux raid autodetect

Disk /dev/sdd: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1   *           1          37      297171   fd  Linux raid autodetect
/dev/sdd2              38       60801   488086830   fd  Linux raid autodetect

Disk /dev/md0: 304 MB, 304218112 bytes
2 heads, 4 sectors/track, 74272 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md0 doesn't contain a valid partition table

Disk /dev/md1: 1499.4 GB, 1499402403840 bytes
2 heads, 4 sectors/track, 366065040 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md1 doesn't contain a valid partition table

-- 
grub2 shows 'biosdisk read error', then boots
https://bugs.launchpad.net/bugs/396564
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