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For more information about hypervisor parameters, see
/usr/share/doc/
packages/xen/pdf/user.pdf
section “Xen Boot Options” after installing the
package
xen-doc-pdf
.
The first
module
line specifies the directory and filename of the Linux kernel to load.
Replace
kernel_parameters
with the parameters to pass to the kernel. These
parameters are the same parameters as those that can be passed to a standard Linux
kernel on physical computer hardware.
The second
module
line specifies the directory and filename of the RAM disk used
to boot the virtual machine host.
To set the GRUB boot loader to automatically boot the Xen virtualization software,
change the
default
entry from
0
, which means the first
title
entry, to the number
that corresponds to the
title XEN
entry. In the example file, Xen is the second
title
line. To specify it, change the value of
default from 0
to
1
.
9.2 Sparse Image Files and Disk Space
If the host’s physical disk reaches a state where it has no available space, a virtual ma-
chine using a virtual disk based on a sparse image file is unable to write to its disk.
Consequently, it reports I/O errors.
The Reiser file system, perceiving a corrupt disk environment, automatically sets the
file system to read-only. If this situation happens, you should free up available space
on the physical disk, remount the virtual machine’s file system, and set the file system
back to read-write.
To check the actual disk requirements of a sparse image file, use the command
du -h
<image file>
.
To increase the available space of a sparse image file, first increase the file size and
then the file system.
WARNING: Backup Before Resize
Touching the sizes of partitions or sparse files always bears the risk of data
failure. Do not work without a backup.
82 Virtualization with Xen