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We do have disk I/O resource control.
Here is the comparison of Virtuozzo for XEN.
- System management tools. Virtuozzo comes with a complete set of management tools which includes an XML/API, complete command Line interface, SOAP interface, and a GUI tool. We also us a secure VPS "Service VPS" interface to manage the connections to the physical server as well as the VPSs. This enables us to completely control traffic to the host from the outside world, and considerably improves the stability of the host OS. We also offer departmental interfaces that would allow administrators to offer a management utility to the individual Virtual servers.
- XEN QOS settings are not changeable without a server reboot. For example in the case of XEN memory must be allocated on VM creation and may not be freed without VM reboot. In the case of Virtuozzo you can change CPU, Memory, Network I/O, Disk I/O all on the fly and without having to reboot the servers. You can also migrate servers, between physical hardware nodes even with non-shared storage. This is not possible with XEN.
- XEN currently supports Linux distributions only. In the case of Virtuozzo management of both Linux and Windows environments are possible. It is also possible to manage both environments under one management interface.
- Virtuozzo offers the ability to template an application and share a single instance of an application without having to load a separate instance of the application for each and every VPS. This will save you on both application licensing costs as well as resource costs on your server.
- XEN is considered a Para virtualization solution. Para virtualization contains the same inherent overhead of technologies such as VMWare - there is a base OS and additional OSes are ported on top, meaning there are multiple complete instances of OSes. This means it is possible to place fewer server instances on a single physical server. So XEN is less scalable and you will experience greater overhead with XEN.
- XEN is not operating in many critical application environments, while VZ is a proven product that has been in production for over 3 years.
I'm not sure how we priced ourselves out of the market. You can put multiple virtual servers on the same physical machine for the price of one. Also with our management tools and templating tools you can create create a preconfigured server in as little as 3 mouse clicks. This saves you time and money. I can also run you through our ROI model if you are interested.
It sounds like you haven't tried Virtuozzo in awhile, it is now available for windows 2003, and if you are interested I can send you the download instructions to test it out.
Dan
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