I think my previous post requires some more info: I've got three HDs, two of them (twin disks) have two partitions, one /boot partition (md0) and the other one for LVM filesystems (md1), where root_vg-root_lv lives (among others). The third disk is unpatitioned, and has one only lv (var_lv)
So, provided this autogenerated grub.cfg entry:
menuentry "Debian GNU/Linux, with Linux 2.6.32-3-686-bigmem" --class debian
--class gnu-linux --class gnu --class os {
insmod raid
insmod mdraid
insmod ext2
set root='(md0)'
search --no-floppy --fs-uuid --set 785366b0-d597-4e9c-9284-b6b9161236ed
echo Loading Linux 2.6.32-3-686-bigmem ...
linux /vmlinuz-2.6.32-3-686-bigmem root=/dev/mapper/root_vg-root_lv
ro rootdelay=25 quiet
echo Loading initial ramdisk ...
initrd /initrd.img-2.6.32-3-686-bigmem
}
...and compared to the examples in the grub wiki¹:
Example grub.cfg for LVM
Below is a sample grub.cfg using LVM. Linux is installed under
MainGroup-linuxLV where MainGroup is the VolumeGroup und linuxLV is
the logical volume. Notice that vmlinuz (the linux kernel) and
initrd.img are lying in the logical volume and can be accessed by
symlinks.
set timeout=20
set default=0
menuentry "Linux on LVM" {
insmod lvm
set root=(MainGroup-linuxLV)
linux /vmlinuz root=/dev/mapper/MainGroup-linuxLV
initrd /initrd.img
}
Example grub.cfg for RAID
This is an example of grub.cfg when the /boot filesystem is on a RAID
device.
insmod raid
set root=(md0)
search --fs-uuid --set 155c8fdb-607f-45a4-bd6d-0dd89f21eac2
menuentry "Linux" {
insmod raid
set root=(md0)
search --fs-uuid --set 155c8fdb-607f-45a4-bd6d-0dd89f21eac2
linux /vmlinuz-2.6.31 root=LABEL=root ro
initrd /initrd.img-2.6.31
}
I can't find documented the scenario when /boot resides in /dev/md0
and root filesystem is mounted in /dev/mapper/root_vg-root_lv (md1, in
my case).
Removing the `quiet' option shows LVM log lines appearing *before*
mdadm lines, which suggest some timming issues in the init scripts(?).
Again, any hints are appreciated.
Regards.
¹ http://grub.enbug.org/LVMandRAID
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