Disk layout is extremely standard:
$ grep sd /proc/partitions
8 0 244198584 sda
8 1 96358 sda1
8 2 3903795 sda2
8 3 240195847 sda3
8 16 488386584 sdb
8 17 488384001 sdb1
8 32 244198584 sdc
8 33 96358 sdc1
8 34 3903795 sdc2
8 35 240195847 sdc3
8 48 488386584 sdd
8 49 488384001 sdd1
$ sudo fdisk -l /dev/sd[abcd]
Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00038c50
Device Boot Start End Blocks Id System
/dev/sda1 * 1 12 96358+ fd Linux raid autodetect
/dev/sda2 13 498 3903795 fd Linux raid autodetect
/dev/sda3 499 30401 240195847+ 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
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdb1 1 60801 488384001 fd Linux raid autodetect
Disk /dev/sdc: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00057200
Device Boot Start End Blocks Id System
/dev/sdc1 * 1 12 96358+ fd Linux raid autodetect
/dev/sdc2 13 498 3903795 fd Linux raid autodetect
/dev/sdc3 499 30401 240195847+ 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
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdd1 1 60801 488384001 fd Linux raid autodetect
Grub lives on all 4 drives, and in the past has had no problem.
For completeness, though I assume well after the stage where grub would
kick into rescue mode, I boot from /dev/md1, which is the sda2/sdc2
pair:
$ cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4]
[raid10]
md2 : active raid1 sdc3[1] sda3[0]
240195776 blocks [2/2] [UU]
md1 : active raid1 sdc2[1] sda2[0]
3903680 blocks [2/2] [UU]
md0 : active raid1 sdc1[1] sda1[0]
96256 blocks [2/2] [UU]
md3 : active raid1 sdd1[1] sdb1[0]
488383936 blocks [2/2] [UU]
unused devices: <none>
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https://bugs.launchpad.net/bugs/690030
Title:
fails to read disk partitions
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