on Mon, Jun 20, 2005 at 10:43:12AM -0500, Tom Adelstein (tadelste@xxxxxxxxxxx) wrote:
> http://www.linuxjournal.com/article/8382
>
>
> This part of the Linux in Government series will cover advances in
> Linux for what IBM calls "On Demand Computing".
>
> In this issue we cover increasing server utilization by virtualization
> - using Linux as the host operating system.
I haven't looked at Xen yet, but was giving qemu a try a few weeks ago.
Got GNU/Linux running readily, also installed FreeDOS, Win3.0, and WinNT
(last involved a few hoops, basically: bootstrap install from FreeDOS
boot floppy image).
The neat thing is that you can basically point at a disk image (or real
floppy / CD) and boot from it. So if you want to try out the latest
Knoppix but don't want to kill your uptime:
$ qemu knoppix.img # image file.
...or
$ qemu /dev/cdrom # CDRom.
...will get you going. I've done this with Tom's Root Boot (Oehser, not
Adelstein), LNX-BBC, Damn Small Linux, and Knoppix).
The main difference between qemu and Xen is that qemu provids full HW
virtualization and does not need a modified kernel to run. Xen requires
a modified Linux kernel to run (the modifications are now part of the
standard kernel tree, and are a build "arch" target, and this is planned
to change). Qemu supports (as I indicate) multiple OSs.
Performance is reasonable but not lickety-split. From my experiences
with VMWare ~2003, it's roughly comperable, though I'm running a 1.4 GHz
now, was ~500 MHz then. Bogomips are reported as ~80% host, though
perceived performance is less than this.
Oh, and NT, which I'd not run for ~six years, *still* sucks rocks.
Peace.
--
Karsten M. Self <kmself@xxxxxxxxxxxxx> http://kmself.home.netcom.com/
What Part of "Gestalt" don't you understand?
Obviously it's not going to be trivial to run GNOME apps outside
of GNOME.
- Adam Hooper, clarifying the topic of GNOME interoperability
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