Specifications

File "/usr/lib/python2.4/site-packages/xen/xend/image.py" , line30, in ?

xc = xen.lowlevel.xc.xc ()

RuntimeError: (2, 'No such file or directory' )

What is most likely happened here is that you rebooted your host into a kernel that is not a

xen-hypervisor kernel. To correct this, you must select the xen-hypervisor kernel at boot

time (or set the xen-hypervisor kernel to default in your grub.conf file.

13. Loop Device Errors

If you use file-based guest images, one may have increased the number of configured loop

devices (the default allows up to 8 loop devices to become active). If you need more than 8

file-based guests/loop devices, you must modify the /etc/modprobe.conf file. When modifying

the modprobe.conf file, you must include this line:

options loop max_loop=64

This example uses 64 but you can specify another number to set the maximum loop value. You

may also have to implement loop device backed guests on your system. To employ loop device

backed guests for a paravirtual system, use the phy: block device or tap:aio commands.

To employ loop device backed guests for a full virtualized system, use the phy: device or

file: file commands.

14. Guest Creation Errors

When you attempt to create a guest, you receive an "Invalid argument" error message. This

usually means that the kernel image you are trying to boot is incompatible with the hypervisor.

An example of this would be if you were attempting to run a non-PAE FC5 kernel on a PAE only

FC6 hypervisor.

You do a yum update and receive a new kernel, the grub.conf default kernel switches right

back to a bare-metal kernel instead of the Virtualization kernel.

To correct this problem you must modify the default kernel RPM that resides in the

/etc/sysconfig/kernel/ directory. You must ensure that kernel-xen parameter is set as the

default option in your gb.conf file.

15. Serial Console Errors

You receive no output to the serial console. To correct this problem, you must modify the

grub.conf and change the com port parameters to:

Chapter 18. Red Hat Virtualization Troubleshooting