Am 12.12.2011 17:01, schrieb Joseph Spenner:
>
> ________________________________
> From: Joseph Spenner <joseph85750@xxxxxxxxx>
> To: "centos@xxxxxxxxxx" <centos@xxxxxxxxxx>
> Sent: Monday, December 12, 2011 8:51 AM
> Subject: dd disk will not boot - can't find /dev/root
>
> OS= CentOS 5.4, 64bit.
>
> I've always had great luck using dd to copy entire disks, and booting on other systems. However, I'm having difficulty with a couple systems. I boot using an install DVD so the OS disk is quiet, and dd to my target disk:
>
> # dd if=/dev/sda of=/dev/sdb bs=1024k
>
> /dev/sdb is the blank disk. The disks are 2T. After a few hours the operation is complete. But when I try to boot the new disk on my other system, I get the following errors after the CentOS boot menu (it counts down to boot the default disk fine, then this error):
>
> (screen shot at http://img214.imageshack.us/img214/645/centosbooterror.jpg ; )
>
> I've read posts regarding the /dev/root error, and they talk about rebuilding initrd. I've tried some of the fixes mentioned, but have had no success.
> All I can think of is slightly different hardware on the new system where I'm trying to boot, but I'm not sure what the difference could be.
> They're both 64bit SuperMicro systems.
>
> If anyone has any ideas, I'd love to hear.
boot from the rescue-cd and reinstall the kernel of the cloned system
or make a new initramdisk per hand - i guess the kernel is missing some
needed hardware-driver of the new computer in the initrd
=============
Thanks for the replies!
I booted the rescue-cd and reinstalled initrd from RPM. That seemed to fix it.
It amazes me how complex the whole boot process needs to be. Or why there doesn't exist a simple bootable CD to fix an incorrect or destroyed MBR /boot partition, based on what it can analyze and figure out.
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