making raid 1

xrado · 02-27-2005, 04:55 PM

i created degradated raid1 using only hdc, and copy all system from hda to it.
then i got this error booting from second disk (hdc):
"Kernel panic: No init found. Try passing init= option to kernel"

using grub menu:
# RAID
title Raid
root (hd0,0)
kernel /boot/vmlinuz root=/dev/md1 ro
savedefault
boot

what shoud i do?

edgood1 · 02-28-2005, 08:34 AM

how did you copy the 'system' ??

are you sure there is a bootloader (grub) installed on the disk?

xrado · 02-28-2005, 08:52 AM

first i got system installed on hda,
then i mounted /dev/hdc1 to /mnt and copyed all directories except /proc and /mnt on it,
then i made empty /proc on /mnt
grub is still instaled on hda, but im booting from hdc wich is md1 for now

is this wrong?

gbonvehi · 02-28-2005, 10:01 AM

root (hd0,0) = hda1
I guess that's wrong...

edgood1 · 02-28-2005, 10:06 AM

install grub on /dev/hdc to make it boot.

if you used 'cp -a' to copy everything it doesn't copy grub....

don't forget to make a mountpoint /sys either

xrado · 02-28-2005, 12:11 PM

thx guys! its working now
it is first time im using grub

but now i have another problem

when i add hda to md1 array using #mdadm /dev/md0 -a /dev/hda1
everything works fine, drives get sync as #cat /proc/mdstat shows
but when i reboot the machine hda1 is missing from the array
the array doesnt get autostart at boot, just hdc1 is in array after reboot
partitions on booth drives have "fd" id

what am i missing?

gbonvehi · 02-28-2005, 12:17 PM

I think that writting mdadm /dev/md0 -a /dev/hda1 in /etc/rc.d/rc.local will do the job.

xrado · 02-28-2005, 12:23 PM

thx for advice!

but isnt there any more elegant option

edgood1 · 02-28-2005, 12:35 PM

did you wait fot the reconstruction process to complete?

i spend many hours at my desk watching 'cat /proc/mdstat' over and over and over and over......

ive seen weird things happen if you don't let the process complete before a reboot....

xrado · 02-28-2005, 01:11 PM

i did
i installed only minimal system to test and learn raid, its about 1Gb all together
so it took about 10min to complete the array

i tryed again and looks like is working now

i tryed also "mdadm -As" after completing the array, maybe it did some trick