I've been playing around with Xen for a few weeks now and enjoying some of the features. If you read anything here and have any suggestions because I did something stupid, feel free to E-mail me (see the bottom of the page).
I configured my base system with a Xen kernel and LVM support. I made the entire disk array
(software RAID with four disks) one big PV (except for
/boot) and configured a volume group
on it we'll call server. I created logical volumes for my root,
/home and a couple other
mount points as usual, leaving much of the space free. When I configured my first domU, a
web server, I created a logical volume of 12G called
/dev/server/xen_webserver1 and installed
Linux on it as per the Xen instructions. Within that server (which sees
/dev/xvda as its
disk), I partitioned it also as one small /boot partition with the rest as a volume group
After some time, I realized I needed more space. I went out to the console of
lvextend to grow the
volume. Then I entered the console for the webserver (
xm console webserver1) and
rebooted it into runlevel 1 and then used
fdisk to delete the PV's partition
/dev/xvda2) and recreate it (with the same start cylinder) to fill the rest of
the now larger disk. After rebooting again (within the virtual 'webserver' machine), I logged
in as root and ran
pvresize /dev/xvda2 and the physical volume was resized to match
the larger partition size after which I could then use that space from within LVM on the webserver.
I was curious about performance issues with running Xen, especially CPU and disk overhead. I've got my results here if you're interested.
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