[CentOS] Old hd, new machine

Robert Heller heller at deepsoft.com
Wed Dec 16 15:21:52 UTC 2009

At Wed, 16 Dec 2009 07:33:38 -0600 CentOS mailing list <centos at centos.org> wrote:

> Jussi Hirvi wrote:
> >>> What should I do to make an existing CentOS (5.4) disc boot up on a new
> >>> computer?
> >>> [...]
> >>> Would it be enough to boot with a DVD in rescue mode, or boot with
> >>> another hd, and install grub?
> > On 16.12.2009 12:16, Sorin Srbu wrote:
> >> For me it has worked to just install the old hd in the new machine and boot
> >> it up. Kudzo takes care of the rest.
> > 
> > Then you have been lucky. :-) For me, the startup stopped already before 
> > the CentOS splash screen. I guess something was wrong with the initrd.
> >
> If the disk holding the / partition needs a different driver than what you had 
> during the install, you have to rebuild the initrd.  Anaconda knows how to do 
> that, kudzo can't.  You can do it from a rescue-mode boot, but you may have to 
> know the right module names.

*Before* swapping out the old disk, add an appropriate scsi_hostadapterN
(N >= 1) alias to /etc/modprobe.conf and then do:

mkinitrd -f /boot/initrd-`uname -r`.img `uname -r`

All should be good then.

IF both the old machine and the new machine have your basic, vanila IDE
disks, then there is no problem.


Robert Heller             -- 978-544-6933
Deepwoods Software        -- Download the Model Railroad System
http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
heller at deepsoft.com       -- http://www.deepsoft.com/ModelRailroadSystem/

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