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Grub2 and and mdraid
From: |
Patrick Begou |
Subject: |
Grub2 and and mdraid |
Date: |
Wed, 30 Sep 2015 14:04:30 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:22.0) Gecko/20100101 Firefox/22.0 SeaMonkey/2.19 |
Hi,
for a while now I'm trying to set up grub to boot on a md array without any
success. The system is actualy runing with:
/dev/sda2 mounted on /boot
/dev/sda3 a physical volume and /dev/mapper/pve-root mounted on /root
(proxmox distribution)
I've added a second disk /dev/sdc to move to a RAID1 config.
/dev/sdc2 is part of a degraded raid1 array /dev/md2 and /dev/md2 is an ext4
filesystem for /boot
/dev/sdc3 is part of a degraded raid1 array /dev/md3 and /dev/md3 is a lvm
physical volume.
On dev/md3 there is a logical volume /dev/mapper/pveraid-root, with ext4
filesystem to mount as /
System has been copied from sda to sdc.
I try to set-up grub with:
mount /dev/md2 /mnt/boot
mount /dev/pveraid/root /mnt/root
cp -dpRx / /mnt/root
cp -dpRx /boot/* /mnt/boot
update-grub -o /mnt/boot/grub/grub.cfg
grub-install --no-floppy --modules="biosdisk raid mdraid1x ext2 part_msdos
part_gpt" --boot-directory=/mnt/boot --recheck /dev/sdc
I've added a menu /etc/grub.d/09_swraid1_setup to try to boot /dev/sdc using the
uuids as described in
http://unix.stackexchange.com/questions/196212/required-grub-modules-for-booting-on-mdadm-raid1
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry 'proxmox with RAID1' --class proxmox --class gnu-linux --class gnu
--class os {
load_video
set root=(mduuid/c65cfbac-c874-4d3b-9b43-47e9d539db35)
echo 'Loading Proxmox with RAID...'
linux /vmlinuz-2.6.32-32-pve root=64342e2a-867b-421a-b5e1-062558c782f0 ro
quiet
echo 'Loading initial ramdisk...'
initrd /initrd.img-2.6.32-32-pve
}
Or without the UUIDs as discribed in
https://www.howtoforge.com/how-to-set-up-software-raid1-on-a-running-system-incl-grub2-configuration-debian-squeeze-p2
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry 'proxmox with RAID1' --class proxmox --class gnu-linux --class gnu
--class os {
load_video
insmod raid
insmod raid1
insmod mdraid
insmod part_msdos
insmod ext2
set root='(md/2)'
echo 'Loading Proxmox with RAID...'
linux /vmlinuz-2.6.32-32-pve root=/dev/mapper/pveraid-root ro quiet
echo 'Loading initial ramdisk...'
initrd /initrd.img-2.6.32-32-pve
}
But every time I get in the a rescue shell, saying the disk is not found. In the
"ls" command of the rescue shell no md devices seams available.
When I try to boot on the raid config, I set /dev/hdc to be the first in the
device order at boot time via the bios.
I can of course restart the server on /dev/sda to keep it runing.
I do not find any help in the grub2 manual nor on the web, just an old
discussion (2013) on a problem with degraded arrays...
Thanks for your advices
Patrick
--
===================================================================
| Equipe M.O.S.T. | |
| Patrick BEGOU | mailto:address@hidden |
| LEGI | |
| BP 53 X | Tel 04 76 82 51 35 |
| 38041 GRENOBLE CEDEX | Fax 04 76 82 52 71 |
===================================================================
- Grub2 and and mdraid,
Patrick Begou <=