[CentOS] how to dual boot centos with redhat?

Tue Aug 3 12:56:42 UTC 2010
Les Mikesell <lesmikesell at gmail.com>

John R. Dennison wrote:
> On Tue, Aug 03, 2010 at 04:09:47PM +0430, hadi motamedi wrote:
>> If so, I can un-subscribe from the list.
> 	Please?  Pretty please?
> 	Or, even better....
> 	Just learn to do some amount of research on your own so we don't
> 	feel you are just using the list to do your work for you.
> 	Google is a wonderful resource, and quite frankly, would
> 	have presented you with *thousands* of applicable hints for
> 	every issue you've raised here.  The CentOS web site and
> 	wiki are also great resources; as are the documents in
> 	/usr/share/doc/* and the man pages.
> 	If we saw you expending some effort to solve your problems
> 	before coming here we wouldn't mind assisting you.

Please point out the search result that will solve his problem if it is so easy 
for you...  Or if you can't, please avoid polluting future searches with 

Specifically, he needs a search result that shows how to get the older RedHat 
installed on the USB disk it doesn't recognize.  There might be a lot that show 
how to point a grub entry to different boot partitions, but he won't get that 
far.  And if he copies a working image from a different install it still 
probably won't recognize the disk it is on, and even if the hardware drivers are 
there he would have to rebuild the initrd to contain them (and what's the driver 

My advice is to buy hardware that an OS recognizes if you want to actually use 
it.  And if you just want to try it out (doing research, perhaps?), install 
VMware on the best machine you have and run the OS in question as a guest.  In 
many cases you can find an image already installed that you can just download 
and run under VMware player.  If you have to build your own, you'll probably 
want the latest version of vmware server 1.x that you can find (the 2.x versions 
have a problem running under Red Hat or Centos and  nobody likes the web based 
console).  Or if you can meet its hardware requirements, load ESXi on the bare 
machine and run all of your other OS's under it.   VMware presents virtual 
hardware that the guests will see as scsi or ide drives regardless of what the 
server is actually using and you can generally copy the images around to 
different physical hosts - and you can do what you need with the free versions.

   Les Mikesell
     lesmikesell at gmail.com