Serge *and Hennign, thanks
Just some informational replies:
Sou mentioned "if you prefer Xen, go with Debian Lenny, or CentOS 5.5." We*are pretty much limited to Ubuntu for this config, we are running a specific customised version of (the generally flakey) Red5 open source media server that we know works on 9.10, so we are there for a while. Actually we are pretty much standardised on Ubuntu, and will move to the next LTS when we can. We do use CentOS to run a particular triple store, but we'd rather standardise on Ubuntu.
Disc performance is very important to us, so its good to hear your pro-Xen advice:*"If performance is key, IMHO you need to go with Xen (or avoid doing virtualisisation, obviously :-) ), especially when it comes to disk performance."*
For info, we have a disc-activity intensive set of web services (web 2.0 social networking services), potentially for use by large numbers of users.
So are we in the world of paravirtualisation? We are running quad-core intel CPUs which support hyperthreading.*
Hennig, yes a reinstall is obviously the way to go, but its worth a quick trial to see what we get from a short cut procedure. Actually thinking about it we should be able to do a complete reinstall and test in a day. Hmmm.... thinks....
It seems that the largest task here is*negotiating*the different options
On Sun, Jun 6, 2010 at 11:40 AM, Serge van Ginderachter <email@example.com> wrote:
On 6 June 2010 12:10, Mark van Harmelen <firstname.lastname@example.org> wrote:
Has anyone got any experience converting a bare metal server to a virtual image? For some free target, maybe KVM or one of the Xen products. Xen is run by one of our friend-companies, so there is a slight preference for that. We are interested in minimising any potential virtualisation overheads, so the less interventionist the virtualisation technology, the better. But if method A is quick and easy to do and is only somewhat slower than method B, we'd in the first instance go method A (time is tight right now).
You basically just need to give you VM Host access to a container which has the disk image(s) of your original server, and tell your vm system to boot that image, possibly with a specific kernel in case of Xen.
Make an image of your offline server with dd, and output that to an LVM volume on your vm host. Once you got that image, you might need to tweak something to provide a specific kernel, depending on your chosen vm techology, and maybe tweak fstab if you have different partitions next to / in your vm guest. Consider paravirtualisation with Xen.
If Ubuntu is your server of choice, KVM will be your best option. If you prefer Xen, go with Debian Lenny, or CentOS 5.5.
If performance is key, IMHO you need to go with Xen (or avoid doing virtualisisation, obviously :-) ), especially when it comes to disk performance.
KVM on the other hand is more easy to set up and to manage.
* * Met cordiale groet,
* * Serge van Ginderachter
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