On Fri, Nov 27, 2015 at 06:18:05PM -0500, Craig Thompson wrote:
> First post to this list. I would appreciate some help on this issue.
> As background, I installed CentOS 7 on a Dell server, and then ran the
> following commands:
> yum update
>
> [1]http://buildlogs.centos.org/centos/7/virt/x86_64/xen/centos-release-xen-7-11.el7.x86_64.rpm
> yum --enablerepo=centos-virt-xen-testing update
> yum --enablerepo=centos-virt-xen-testing install xen
> Doing that, I was able to successfully install Xen, create a virtual
> machine with its own HVM setup, logical volume, etc. and boot it just
> fine.
> I then tried to do the same on an IBM x3550 server I*m trying to install
> with CentOS 7. The CentOS 7 install went just fine. I can boot into the
> standard kernel and have a working machine. But after running the
> commands above to install the Xen hypervisor, the machine hangs on boot
> for a few moments after displaying the lines below and then reboots in a
> loop over and over and over:
> Loading Xen 4.6.0-2.el7 *
> Loading Linux 3.18.21-16.el7.x86_64 *
> Loading initial ramdisk *
> It never gets beyond that.
>
Weird. So you don't see any output from Xen?
I guess that means GRUB gets stuck somehow, and doesn't even get to actually
starting Xen..
> If I choose the stock kernel (no Xen) from the
> Grub menu, it will continue to boot into that just fine.
> My grub.cfg file has these entries of note:
> multiboot /xen-4.6.0-2.el7.gz placeholder
> dom0_mem=1024M,max:1024M cpuinfo com1=115200,8n1 console=com1,tty
> loglvl=all guest_loglvl=all ${xen_rm_opts}
> echo 'Loading Linux 3.18.21-16.el7.x86_64 ...'
> module /vmlinuz-3.18.21-16.el7.x86_64 placeholder
> root=UUID=9dc18146-f9b3-41cc-ba9c-7314689abcde ro crashkernel=auto debug
> irqpoll ipv6.disable=1 console=hvc0 earlyprintk=xen nomodeset
> echo 'Loading initial ramdisk ...'
> module --nounzip /initramfs-3.18.21-16.el7.x86_64.img
> What I have tried:
> 1) adding debug into the vmlinuz line
> 2) disabling ipv6 in that line
> 3) adding root=UUID=9dc18146-f9b3-41cc-ba9c-7314689abcde to the last line
> AFTER /initramfs *.
> Nothing so far has made any difference. Obviously the process works, as
> it works for me just fine on the Dell server.
> Underlying this machine is a SATA RAID 1 PCI card with two SSD drives
> attached in a RAID 1 mirror. Not that that should matter, but I*m
> including it for reference. As noted previously, it boots into the stock
> kernel just fine.
> Any help would be appreciated.
>
Yeah it's not about options to Xen and/or Linux when GRUB fails to boot the
entry in the first place..
Is this UEFI setup? Or legacy-BIOS? Did you try playing with the BIOS options?
-- Pasi
> --
> Craig Thompson, President
> Caldwell Global Communications, Inc.
> 423-559-5465
>
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