I need help FAST! Kernelupdate = no boot.

bredin · 2009-10-14 19:06:32

So I updated my kernel, and then when I rebooted the system didn't start at all.

initramfs gives error that mdadm can't find the devices for my 2 lvm raids. /dev/md0 /dev/md1
/dev/md1 consists of /dev/sdb1 /dev/sdc1 and /dev/md1 of /dev/sdd1 /dev/sde1. The drives are formated as reiserfs and /dev/sda is ext4.

I get 2 optiones, where's one is to reboot or the other to exit and resume normal boot. And if I exit I get a kernel-panic.
I have dm-mod & raid1 loaded as modules in /etc/rc.conf
I have MODULES="ext4 reiserfs ahci raid1" in /etc/mkinitcpio.conf and I tried with these hooks: HOOKS="base udev autodetect pata scsi sata filesystems lvm2 mdadm"

here is how my mdadm.conf looks like: ARRAY /dev/md0 level=raid1 num-devices=2 metadata=0.90 #UUID=77a8c1c0:b3d7e2f8:af9795ab:03d0a1cd
ARRAY /dev/md1 level=raid1 num-devices=2 metadata=0.90 #UUID=88b0efc9:7cb295b4:2a479691:6ac48900

any ideas?

lilsirecho · 2009-10-14 19:45:02

Perhaps you don't have the file /etc/mdadm.conf in your /etc directory.

This is required for mkinitcpio to obtain the raid array data for inclusion in initramfs.

If the file is missing, the latest kernel and its mkinitcpio re-invoke will not find the array and the kernel will not boot.

If this is the problem, a LiveCD boot and chrrot will aid in re-establishing the /etc/mdadm.conf file.

My experience with this was not as severe as yours since my raid0 is not used for boot but I did lose the raid0 because the /etc/mdadm.conf file had been deleted.

Good luck.........

lilsirecho · 2009-10-14 19:50:11

My system recognizes the drives with uuid in raid0.

bredin · 2009-10-14 19:57:56

there is a /etc/mdadm.conf file, and as I rememberd when the kernel was updating it said that it used a custom mdadm.conf file. I've been trying to chroot my arch-root from a ubuntu-live-cd to run:

rm /etc/mdadm.conf
mdadm –D –-scan >> /etc/mdadm.conf

Bit it seems I'm just to noob to figure out how chroot works.
I mounted my / (/dev/sda3) to /media/ in the ubuntu-live-cd. then I tried to run chroot /media/ /bin/bash and it didn't work.

This is the complete mdadm output:

:: Loading Initramfs
mdadm: no devices found for /dev/md0
mdadm: no devices found for /dev/md1
     read_urandom: /dev/urandom: open failed: No such file or directory
     read_urandom: /dev/urandom: open failed: No such file or directory 
Waiting 10 seconds for device /dev/sda3 ...
ERROR: Faild to pare block device ids for '/dev/sda3'
ERROR: Unable to detect or create root device '/dev/sda3'
You are being dropped to a recovery shell
     Type ´reboot´ to rebot
     Type ´exit´to try and continue booting 
NOTE: klibc contains no 'ls' binary, use ´echo *´ instead

If the device '/dev/sda3' gets created while you are here, try adding ´rootdelay=10´ or higher to the kernel command-line

Last edited by bredin (2009-10-14 20:18:21)

lilsirecho · 2009-10-14 20:13:50

Perhaps you will find a good reference for chroot in the wiki called "kernel panics".

I found it useful........

bredin · 2009-10-14 20:39:54

I chrooted my / with the arch installation cd, I ran:

mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1
mdadm --assemble /dev/md1 /dev/sdd1 /dev/sde1

and then I ran the:

rm /etc/mdadm.conf
mdadm –D –-scan >> /etc/mdadm.conf

and A new /etc/mdadm.conf was created. And it still does not work!

Last edited by bredin (2009-10-14 20:47:13)

bredin · 2009-10-14 20:55:22

I actually went as far as:

root@ubuntu:/mnt# cat etc/mdadm.conf
ARRAY /dev/md0 level=raid1 num-devices=2 devices=/dev/sdb1,/dev/sdc1 metadata=0.90 UUID=77a8c1c0:b3d7e2f8:af9795ab:03d0a1cd
ARRAY /dev/md1 level=raid1 num-devices=2 devices=/dev/sdd1,/dev/sde1 metadata=0.90 UUID=88b0efc9:7cb295b4:2a479691:6ac48900
DEVICE /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1

Guess what, it doesn't work! If nobody have posted a fix for this till tomorrow morning will I re-install Vista.

lilsirecho · 2009-10-14 22:52:51

If the info you posted is actual code, there is a typo in the first line:

@ubuntu:/mnt# cat etc/mdadm.conf
ARRAY /dev/md0 level=raid1 num-devices=2 devices=/dev/sdb1,/dev/sdc1 metadata=0.90 UUID=77a8c1c0:b3d7e2f8:af9795ab:03d0a1cd
ARRAY /dev/md1 level=raid1 num-devices=2 devices=/dev/sdd1,/dev/sde1 metadata=0.90 UUID=88b0efc9:7cb295b4:2a479691:6ac48900
DEVICE /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1

The first line should show /etc/mdadm.conf..............

bredin · 2009-10-15 00:21:12

lilsirecho wrote:

If the info you posted is actual code, there is a typo in the first line:
@ubuntu:/mnt# cat etc/mdadm.conf
ARRAY /dev/md0 level=raid1 num-devices=2 devices=/dev/sdb1,/dev/sdc1 metadata=0.90 UUID=77a8c1c0:b3d7e2f8:af9795ab:03d0a1cd
ARRAY /dev/md1 level=raid1 num-devices=2 devices=/dev/sdd1,/dev/sde1 metadata=0.90 UUID=88b0efc9:7cb295b4:2a479691:6ac48900
DEVICE /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
The first line should show /etc/mdadm.conf..............

Actually not. The / drive was mounted in /mnt and I was standing in /mnt. so instead of /mnt/etc/mdadm.conf i just went etc/mdadm.conf as /etc was a folder in the folder I was standing in.

Anyway, I solved the problem by installing Vista <3

Arch Linux

#1 2009-10-14 19:06:32

I need help FAST! Kernelupdate = no boot.

#2 2009-10-14 19:45:02

Re: I need help FAST! Kernelupdate = no boot.

#3 2009-10-14 19:50:11

Re: I need help FAST! Kernelupdate = no boot.

#4 2009-10-14 19:57:56

Re: I need help FAST! Kernelupdate = no boot.

#5 2009-10-14 20:13:50

Re: I need help FAST! Kernelupdate = no boot.

#6 2009-10-14 20:39:54

Re: I need help FAST! Kernelupdate = no boot.

#7 2009-10-14 20:55:22

Re: I need help FAST! Kernelupdate = no boot.

#8 2009-10-14 22:52:51

Re: I need help FAST! Kernelupdate = no boot.

#9 2009-10-15 00:21:12

Re: I need help FAST! Kernelupdate = no boot.

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