Re: Looking for advise on a special grub setup.

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On Sun, 2010-02-28 at 22:03 -0500, Steven W. Orr wrote:
> I have two hard drives which look like this:
> 
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda6             9.4G  1.5G  7.5G  16% /
> /dev/sda11             85G   45G   36G  57% /g
> /dev/sda10             30G  6.1G   23G  22% /h
> /dev/sda5              30G   21G  7.6G  74% /home
> /dev/sda8             1.9G   36M  1.8G   2% /tmp
> /dev/sda9             9.3G  4.7G  4.1G  54% /e
> /dev/sda2              31G   19G  9.9G  66% /var
> /dev/sda3              31G  9.4G   20G  33% /usr
> /dev/sdb1             294G  244G   36G  88% /d2
> /dev/sda1             479M   52M  403M  12% /boot
> tmpfs                 1.5G  472K  1.5G   1% /dev/shm
> 
> I just bought a new 1T SATA drive to add to the mix, and here's what I'd like
> to do (but I don't understand how to do it).
> 
> I want to add the new drive as a third disk so that the system will continue
> to boot off of sda. I'm current;y running F10 in 32 bit mode.
> 
> After I add the new drive, it will be seen as sdc, and I will want to install
> F12 in 64 bit mode on sdc.
> 
> Q0: Can I tell the install DVD to install on sdc and to leave sda alone?

Yes. Customize partitions and check every item twice.

> Q1: Is it possible to have multiple bootable devices? And how do I do this?

Yes. This is the process you should setup:

a) Bios starts OS from the disk you select (in your case, sda)
b) Grub chooses which disk to boot from (in your case, sda1 or, say,
sdc1)

If you are not so sure, you can

a) Bios boot from sdc
b) Grub choosing boot from sda1 or sdc1

> Next, after I'm thrilled to death that sdc is how I want it to be, I want to
> make a cutover so that sdc will then become the primary boot device. My
> understanding is that the four SATA plugs I have on my motherboard are defined
> so that one (currently sda) is considered to be the primary device.
> 
> Q2: When I do a cutover, do I have to switch the cables on the new sdc and
> what is now sda? Will the new drive end up being referred as sda and the now
> current sda become sdc?

Ah, you should know hoy your bios chooses which one is sda, which sdb,
etc. That depends on cabling. I believe:

IDE1/Master: hda/sda 
IDE1/Slave: hdb/sdb 
IDE2/Master: hdc/sdc 
IDE2/Slave: hdd/sdd 

and so on.

> Q3: Is there a grub command I need to run to make the new drive become the
> bootable device? Or do I have to then reload from scratch to make it all work?

Yes. just check your /boot/grub/menu.lst, google for grub and man grub

> Thanks :-)

Please, tell us by the list how it went. Greets!
----------------------------------------------
Rodolfo Alcazar - rodolfo.alcazar@xxxxxxxxxxxx
otbits.blogspot.com / counter.li.org: #367962
----------------------------------------------


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