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Boot errors, fix for EVMS



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October 27, 2009 12:08 pm

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After installing updates on SLES/OES servers we have had issues where the server doesn’t boot. The console comes to:

"No root device found; exiting to /bin/sh
sh: "

Usually the console is unresponsive.

This is because the kernel was upgraded and a new initrd was created but it was not created with EVMS support (for some reason, not sure why, wonder when Novell/Suse is going to fix this??).

Mostly copied from:
http://www.lotterer.net/blog/en/51-sles10-with-evms-missing-root-past-boot

# boot with the SLES10 AMD64/EMT64 CD1 or DVD. Use the correct arch, 32 or 64 bit.
The link says to use rescue mode of a SLES cd, but I like using RIPLinux 7.2. 
(the newer versions don't support evms).
RIPLinux 7.2 has a smaller footprint so it boots faster.
# boot to rescue mode and enter "root" at the prompt. You will be at a command prompt. #This isn't needed, but I left it just in case. # sidenote: to access a CD/DVD at this point, use # modprobe ide-cd; mkdir -p /mnt; mount /dev/hda /mnt # probe EVMS information echo "probe" | evms -s # query devices echo "q:d" | evms -s # query volumes, this should display the name your root container echo "q:v" | evms -s #If you know your mount points, you won't really need to use the commands above. # mount root (note the comma in the mount command after the "sys_lx") This should be mounting your root files system. echo "mount:/dev/evms/lvm2/system/sys_lx,/mnt" | evms -s If you have /var as a separate partition you'll want to mount it also. Ex: mount /dev/evms/lvm2/system/var /mnt/var #and if boot is separate: (it should be) mount /dev/evms/sda1 /mnt/boot # you should see your valuable data on the old root ls -l /mnt/ # turn your old root into the current root mount -t proc none /mnt/proc mount -o bind /dev /mnt/dev chroot /mnt /bin/bash #you must choose the correct RIP kernel for your architecture. #you may get an error here if you did not choose the correct arch # create a new EVMS ramdisk /sbin/mkinitrd -f evms #exit chroot exit #dismount volumes umount /mnt/boot umount /mnt/var umount /mnt # shutdown properly and reboot init 6 or reboot #or press CTRL+ALT+DEL
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Disclaimer: This content is not supported by Novell. It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test it thoroughly before using it in a production environment.

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