CentOS - Oct 2008 - [Fwd: Re: Install CentOS-5.0 on HP-ComPaq DC7700 Dual Core]

---------------------------- Original Message ----------------------------
Subject: Re: [CentOS] Install CentOS-5.0 on HP-ComPaq DC7700 Dual Core
From:    "James B. Byrne" <byrnejb at harte-lyne.ca>
Date:    Mon, October 6, 2008 12:26
To:      cenos at centos.org
Cc:      "John Newbigin" <jnewbigin at ict.swin.edu.au>
--------------------------------------------------------------------------


On Sun, October 5, 2008 20:39, John Newbigin wrote:
> Also make sure you have the latest firmware and set the hard disk mode
> in the BIOS to Raid (Which will enable AHCI).
>
> John.
By the time I received this message I had already installed the ia_64
version of CentOS-5.2 with the BIOS set to IDE emulation.  If now I change
the BIOS to use RAID then the system cannot see the SATA drive at all.

Is it possible to change the BIOS setting to RAID and subsequently load
the necessary drivers from the boot DVD without having to reinstall the
entire system?

If so, then what is the procedure?

Regards,

-- 
***          E-Mail is NOT a SECURE channel          ***
James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3



-- 
***          E-Mail is NOT a SECURE channel          ***
James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3

James B. Byrne wrote:
> By the time I received this message I had already installed the ia_64
> version of CentOS-5.2 with the BIOS set to IDE emulation.  If now I change
> the BIOS to use RAID then the system cannot see the SATA drive at all.
There is no ia64/ CentOS-5.2


-- 
Karanbir Singh : http://www.karan.org/  : 2522219 at icq

> There is no ia64/ CentOS-5.2
x86_64


The substantive question remains unanswered.  Can I install the new disk
drivers for SATA AHCI from the 64 bit CentOS-5.2 boot dvd without having
to reinstall the entire OS or not?

Regards,

-- 
***          E-Mail is NOT a SECURE channel          ***
James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3

Edit /etc/modprobe.conf
and add
alias scsi_hostadapter2 ahci

Then rebuild your initrd with mkinird
mkinitrd -f /boot/initrd-$(uname -r).img $(uname -r)

Then reboot and make the BIOS change.  This should give you much better 
disk performance.


James B. Byrne wrote:
> 
> ---------------------------- Original Message ----------------------------
> Subject: Re: [CentOS] Install CentOS-5.0 on HP-ComPaq DC7700 Dual Core
> From:    "James B. Byrne" <byrnejb at harte-lyne.ca>
> Date:    Mon, October 6, 2008 12:26
> To:      cenos at centos.org
> Cc:      "John Newbigin" <jnewbigin at ict.swin.edu.au>
> --------------------------------------------------------------------------
> 
> 
> On Sun, October 5, 2008 20:39, John Newbigin wrote:
>> Also make sure you have the latest firmware and set the hard disk mode
>> in the BIOS to Raid (Which will enable AHCI).
>>
>> John.
> 
> By the time I received this message I had already installed the ia_64
> version of CentOS-5.2 with the BIOS set to IDE emulation.  If now I change
> the BIOS to use RAID then the system cannot see the SATA drive at all.
> 
> Is it possible to change the BIOS setting to RAID and subsequently load
> the necessary drivers from the boot DVD without having to reinstall the
> entire system?
> 
> If so, then what is the procedure?
> 
> Regards,
> 

-- 
John Newbigin
ITS Senior Analyst / Programmer
Faculty of Information and Communication Technologies
Swinburne University of Technology
Melbourne, Australia
http://www.ict.swin.edu.au/staff/jnewbigin