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switching from single IDE drive to Promise IDE RAID

From: Amith Varghese
Subject: switching from single IDE drive to Promise IDE RAID
Date: 24 Jul 2002 22:37:37 -0400

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


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 >
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

I get the following error

SCSI subsystem driver Revision: 1.00
request_module[scsi_hostadapter]: Root fs not mounted


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.


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