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3 Enter sax2 to run the SaX2 graphical configuration module.
4 Configure the GUI as desired.
5 Enter telinit 5 to switch to GUI mode.
5.6 Paravirtual Mode and Journaling
It is recommended that operating systems running in paravirtual mode set up their kernel
on a separate partition that uses a non-journaling file system, such as ext2.
Before a paravirtualized operating system can boot, the management domain must
construct a virtual machine and place the paravirtualized kernel in it. Then, the paravir-
tualized operating system boots. To retrieve the kernel during the bootstrapping process,
the virtual machine's boot disk is mounted in read-only mode, the kernel is copied to
the virtual machine's memory, and then the boot disk is unmounted.
When a virtual machine's operating system crashes, its disks are not shut down in an
orderly manner. This should not pose a problem to a virtual machine running in full
virtualization mode because the pending disk entries are checked and corrected the next
time the operating system starts. If the disk is using a journaling file system, the journal
is replayed to update and coordinate any pending disk entries.
This type of system crash poses a potential problem for paravirtualized operating sys-
tems. If a paravirtualized operating system using a journaled file system crashes, any
pending disk entries cannot be updated and coordinated because the file system is ini-
tially mounted in read-only mode.
Therefore, it is recommended that you set virtual machine boot files, such as the kernel
and ramdisk, on a separate partition that is formatted with a non-journaling file system,
such as ext2.
46
Virtualization with Xen
File Systems
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