Slackware :: Best Virtualisation For 24x7 LAMP - Joomla - Server

My task is to set-up a dedicated LAMP server to host a site with joomla (this is basically LAMP + joomla which is a PHP-based content management system). Beside the basic web content, the site will hold a large amount of sample videos and similar large files (2TB on a RAID is available a lot of them will be used).

I googled a lot, and I read a lot about all the virtualisation solutions such as kvm, xen, virtualbox, vmware, openvz and vserver, I more or less understand their properties, but I cannot decide which one to choose.

I tried a few of them but I have no experience about its long term usage, stability etc.

In short I need an advice from people who successfully running real-word sites with some virtualisation solution. Basically I would like to know which one to use for the more robust, stable server.

Only read further if you have a similar system.

I would like to use some kind of virtualisation solution for the joomla server, becauseI have no trust in such systems, so if it is hacked I will just recover from a backup (or reinstall) the guest, but I do not need to go to the server-park. (after it, I have to find out how it was hacked) perhaps later we would like to use some other services which is also good if they are separated

I would like to use Slackware as a host and a guest.

I would like to put one file-system to the large raid array, and share it among the virtual-servers if it is possible (there is only one server now but there could be more with different applications). Or do I need to use lvm on the raid for the different servers?

Here is what I think:Because I want to "run linux on linux", first I thought that a container based solution (vserver, openvz) is perfect for the job, because of the low overhead and because I can use the whole file system for the storage, and I can share free space with other services in the future. The problem is vserver and openvz are big patches for the kernel, but I would like to change slackware as small as possible. So I would like to stay with the kernel of slack-13.0. openvz does not even support 2.6.29 while vserver is, but I have to compile a new patched kernel. So the the options here are to use a different kernel with openvz, or use the same but patched kernel with vserver.

Another option is to use "real" virtualisation solutions such as kvm, xen, virtualbox and vmware. It seems that kvm is the future, because it is already in the official kernel and "powered" by Red Hat, so it will be well supported. I likely will choose kvm.

As i wrote I tried a few of them but I have no experience about its long term usage, stability, so I want here about which one is used in real word servers, what kind of problems (stability) they have, etc.?