[fedora-virt] CentOS 6 install via virt-install - "No usable disks have been found."

[Bill McGonigle]

Hi, all,

I'm not seeing disks under CentOS 6 when trying to install.  I'm using:

   xen-4.0.2-1.fc14.x86_64
   2.6.32.39-175.xendom0.fc13.x86_64

installing using:

virt-install --debug -n sully --mac=02:00:0A:01:01:10 -f 
/var/lib/xen/images/sully -s 12 -r 2048 --vcpus=2 --nographics -p 
--os-type=linux --os-variant=rhel6 --location 
http://librescu.bfccomputing.com/cobbler/ks_mirror/centos6-x86_64/

It sounded like:

   https://bugzilla.redhat.com/show_bug.cgi?id=678374

so I tried dropping the --nonsparse option, but I'm using a newer 
version of python-virtinstall:

   python-virtinst-0.500.6-1.fc14.noarch

than should be required, and I'm seeing this with and with the option 
anyway.

I do see the disk image is created, and attached to the DomU.  e.g.:

[2011-07-26 01:01:47 18534] DEBUG (DevController:97) DevController: 
writing {'domain': 'sully', 'frontend': 
'/local/domain/18/device/vbd/51712', 'uuid': 
'3380cea8-a322-292d-cc5d-8bb084306976', 'bootable': '1', 'dev': 'xvda', 
'state': '1', 'params': 'aio:/var/lib/xen/images/sully', 'mode': 'w', 
'online': '1', 'frontend-id': '18', 'type': 'tap'} to 
/local/domain/0/backend/tap/18/51712.

and I can see the disk image if I dump configuration from virsh.

I do see this in the DomU kernel messages:

   XENBUS: Device with no driver: device/vbd/51712
   XENBUS: Device with no driver: device/vif/0
   XENBUS: Device with no driver: device/console/0

but I see reports online that say not to worry about those, initrd will 
load the modules.

The initrd does have:

   ./kernel/drivers/xen
   ./kernel/drivers/xen/xenfs
   ./kernel/drivers/net/xen-netfront.ko.gz
   ./kernel/drivers/block/xen-blkfront.ko.gz

on it.

I tried adding:

   xen_emul_unplug=never

to the kernel parameters per a previous thread here, but that didn't 
seem to change anything.

It seems like others are having success with CentOS 6 in general:

 
http://grantmcwilliams.com/tech/virtualization/xen-howtos/538-centos-6-virtual-machine-64-bit-installation-on-xen

so I suspect it's got something to do with Xen 4.0.2, but I'm not sure 
where to look right now.

Any suggestions?

-Bill

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Bill McGonigle, Owner
BFC Computing, LLC
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