Re: switching from single IDE drive to Promise IDE RAID

[Amith Varghese]

I figured it out... pretty stupid.  Remember to compile RAM disk support
into the kernel as opposed to compiling it as a module.  When its a
module you don't get the initrd support.  Grub was working fine, just my
kernel wasn't :)

Amith

On Wed, 2002-07-24 at 22:37, Amith Varghese wrote:
> I have installed redhat 7.3 on a small IDE drive and now I am trying to
> switch over to an IDE RAID array that I have constructed using the
> Promise SX6000.  I want to be able to boot off of the RAID and remove
> the small IDE drive.
>   
> However I am having problems getting the kernel on the RAID to boot
> because for some reason it is unable to mount the root file system.
> 
> Originally I had all my data on /dev/hda1 (the IDE drive connected to
> the onboard controller).  I then created 6 partitions on /dev/sda
> 
> /dev/sda1 - is /
> /dev/sda2 - is /usr
> /dev/sda3 - is /home
> /dev/sda5 - swap
> /dev/sda6 - swap
> 
> I used cp -ax to copy the files from /dev/hda1 to the appropriate
> partitions on /dev/sda.  I then did the following:
> 
> 1) Copied the pti_st.o promise driver into
> 
>    /lib/modules/2.4.18/kernel/drivers/scsi/
> 
> 2) I then added "alias scsi_hostadapter pti_st" to /etc/modules.conf
> 3) Ran "/sbin/mkinitrd /boot/initrd-2.4.18 2.4.18"
> 4) I gunziped the initrd-2.4.18 file and mounted it.  Inside contains
> /lib/pti_st.o and a linuxrc script and some other stuff.  The linuxrc
> script runs the command "insmod /lib/pti_st.o"
> 5) Shut down the machine and Unplugged the IDE HD.
> 6) Boot off of a grub floppy that I made by running cat stage1 stage2 >
> /dev/fd0
> 7) Ran the following commands from grub
> 
>    root (hd0,0)
>    kernel /boot/vmlinuz-2.4.18 ro root=/dev/sda1
>    initrd /boot/initrd-2.4.18
>    boot
> 
> I get the following error
> 
> SCSI subsystem driver Revision: 1.00
> request_module[scsi_hostadapter]: Root fs not mounted
> 
> [snip...]
> 
> VFS: Cannot open root device "sda1" or 08:01
> Please append a correct "root=" boot option
> kernel panic: VFS: Unable to mount root fs on 08:01
> 
> Does anyone know why I am getting this error?  What should my "root="
> boot option be?
> 
> Any help is appreciated.
> 
> Thanks
> Amith
> 
> 
> 
> 
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