This is a really long email...my apologies.
Hardware platform: Dell Poweredge 1855 (blade), Dual Xeon 2.8 GHz; 12 MB
RAM; PERC 4/IM; mirrored 73 GB U320 SCSI; qLogic 2312 PCI Fibre Channel
HBAs.
OS: (currently) CentOS 4.3, gcc 3.4.5
Software: Xen 3.0.2-2
Attempting to boot off local SCSI RAID (mirror)...not the SAN.
I am more of a Solaris person, so forgive me if I don't know all I should
about Linux. I'm learning, but a long, long way from guru status.
(I have tried using Red Hat Enterprise 3 update 7, and 4 update 3 with the
same results.)
I installed Xen from source, with no problems, following the instructions
in the README. (I had to build the bridge-utils software from source, but
the other needed software is included.) I did the following to install from
the source.
# make KERNELS="linux-2.6-xen0 linux-2.6-xenU" world
# make install
This did exactly what I expected, including placing the following files
and links in the /boot directory:
# ls -aF /boot/*xen*
config-2.6.16-xen vmlinux-syms-2.6.16-xen xen-3.0.2-2.gz xen.gz@
initrd-2.6.16-xen.img vmlinuz-2.6.16-xen xen-3.0.gz@
xen-syms-3.0.2-2
System.map-2.6.16-xen vmlinuz-2.6-xen@ xen-3.gz@
(I did create the initrd-2.6.16-xen.img file myself.(more on this later))
The Xen entry in my grub.conf file is as follows:
title Xen 3.0.2-2 / XenLinux 2.6
root (hd0,0)
kernel /xen-3.0.gz dom0_mem=262144
module /vmlinuz-2.6-xen root=LABEL=/ ro
module /initrd-2.6.16-xen.img
When I tried booting from the Xen kernel with the grub config:
title Xen 3.0.2-2 / XenLinux 2.6
kernel /xen-3.0.gz dom0_mem=262144
module /vmlinuz-2.6-xen root=LABEL=/ ro
as suggested by the documentation, I observe a kernel panic with the message
Kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)
I assume this is because there is no driver support for the PERC 4/IM in the
Xen kernel.
So, I thought to create a initrd file, to provide support for the PERC
4/IM. I first had to use the command "depmod 2.6.16-xen" because there was
no modules.dep file in /lib/modules/2.6.16-xen. When I attempted to create
the initrd file from the 2.6.16-xen directory, it failed because there were
no kernel module files for the qla2300 card.
So, I copied the files listed in the modules.dep file for the 2.6.9-34-EL
kernel that comes with CentOS 4.3 to the corresponding
/lib/modules/2.6.16-xen locations.
/lib/modules/2.6.9-34.EL/kernel/drivers/scsi/qla2xxx/qla2300.ko:
/lib/modules/2.6.9-34.EL/kernel/drivers/scsi/qla2xxx/qla2xxx.ko
/lib/modules/2.6.9-34.EL/kernel/drivers/scsi/scsi_transport_fc.ko
/lib/modules/2.6.9-34.EL/kernel/drivers/scsi/scsi_mod.ko
I edited the modules.dep line in /lib/modules/2.6.16-xen to read as follows:
/lib/modules/2.6.16-xen/kernel/drivers/scsi/qla2xxx/qla2300.ko:
/lib/modules/2.6.16-xen/kernel/drivers/scsi/qla2xxx/qla2xxx.ko
/lib/modules/2.6.16-xen/kernel/drivers/scsi/scsi_transport_fc.ko
/lib/modules/2.6.16-xen/kernel/drivers/scsi/scsi_mod.ko
I then was able to create the initrd file, and called it
"initrd-2.6.16-xen.img". When I boot with the grub.conf what includes the
initrd, we get past finding the root directory, so I guess we now have
support for the RAID controller, but now I get another kernel panic. I have
not been able to write down much of what is on the screen, except the kernel
does not sync, and it cannot find label /.
Oh, the /etc/fstab file reads:
# This file is edited by fstab-sync - see 'man fstab-sync' for details
LABEL=/ / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /dev/shm tmpfs defaults 0 0
LABEL=/local /local ext3 defaults 1 2
none /proc proc defaults 0 0
none /sys sysfs defaults 0 0
LABEL=SWAP-sda3 swap swap defaults 0 0
Help? I know copying ko files was probably pretty cludgy. Is there a better
way? If I were to try to include support for the PERC 4/IM and qLogic
hardware into the Xen kernel, how would I do that? I am something of a
newbie, so perhaps there is a "HOWTO" out there that could help?
In advance, many, many thanks.
Randy
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