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| Maurizio Manetti... |
 Posted: Mon Mar 23, 2009 3:33 am |
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Guest
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Hi all!
I'm trying to convert a running installation of a Ubuntu server 7.10
AMD64 running on a single drive to a RAID 1 system, but I'm stuck at the
boot with a BusyBox shell.
The machine has two identical SATA drives, the system is at the moment
installed on partition /dev/sda1 (/dev/sda2 being the swap partition).
These are the steps I did until now:
1. made a backup of the system on an external drive
2. cfdisk /dev/sdb to have exactly the same partitions of /dev/sda
3. created md0 device node (mknod /dev/md0 b 9 0)
4. installed mdadm
5. created raid device:
mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb1
6. checked /proc/mdstat (it's ok)
7. created filesystem on /dev/md0
8. mounted /dev/md0 on /mnt/md0 and copied data from /dev/sda1 (/)
to /dev/md0 (/mnt/md0/) via rsync excluding content of /sys, /proc,
/dev, /mnt
9. edited grub menu in /mnt/md0:
modified menu.lst just in "root" argument with "root=/dev/md0"
10. edited /etc/fstab in /mnt/md0 specifying that root has to be
mounted from /dev/md0
11. chrooted to /mnt/md0
12. updated ramdisk with update-initramfs
13. installed grub on the new raid disk:
root (hd1,0)
setup (hd1)
All went ok
14. rebooted and changed BIOS setting to start from the new disk
At that point, grub starts, but after about 1 minute I get an error and
then a BusyBox shell.
This is the error:
Check root= bootarg cat /proc/cmdline
or missing modules, devices: cat /proc/modules ls /dev
ALERT! /dev/md0 does not exist. Dropping to a shell!
If I check with "cat /proc/cmdline" I get the following:
root=/dev/md0 ro quiet splash
which looks to be correct
List of modules shows that raid modules and md_mod are present.
Command mdadm is present
If I give the command:
mdadm --assemble /dev/md0
I get the following:
mdadm: CREATE user root not found
mdadm: CREATE group disk not found
mdadm: /dev/md0 not identified in config file.
"ls -l /dev/md0" shows that device md0 is present (or at least, it seems):
brw-rw---- 1 0 0 9, 0 /dev/md0
Any help or suggestion would be greatly appreciated.
Fortunately I still get a fully working system if I boot from the first
hard drive. |
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