Flexibility is essential in a fast changing environment. Your VPS server needs to be adaptable and scalable at the touch of a button. Make sure that your VPS provider gives you this flexibility, A great feature is a VPS control via mobile phone. Check out if your VPS provider includes the ability to increase your CPU, RAM or storage from your smartphone. A very user friendly app is provided by OnApp, a Cloud software developer from the UK.
Xen compared with OpenVZ
Lets talk hypervisor and before you do a runner let me assure you that this blog is not going to overwhelm with too much tech jargon instead it should help trying to explain the functioning of a Virtual Server in simple terms. A hypervisor acts like a monitor of a Virtual Machine or in other words it is software that provides a virtual working platform on which a guest can install an operating system. This article will help to explain why some of the VPS hosting companies are using Xen technology and explain the main differences with OpenVZ, both systems are open source server virtualization technology Xen is a hypervisor providing services that allow multiple computer operating systems to execute on the same computer hardware at the same time. This process is called virtualization, offering many benefits such as:
There are different types of virtualization that we are not further exploring here; important to understand is that Xen is a layer of software running directly on the machine’s hardware, replacing its OS. This allows that the hardware can run multiple guest operating systems (Linux or Windows) concurrently. It becomes the interface for all hardware requests. Another important point is that Xen Server are designed to maintain absolute and dedicated resource limitation. it is therefore impossible to overcommit the resources on this server. A customer who is buying 3 GB RAM with 128 GB disk will have exactly that portion guaranteed on the Virtual Server. OpenVZOpenVZ is an operating system level virtualization technology based on the Linux kernel and Linux OS. It allows a physical machine to run multiple isolated OSs called containers Features are:
OpenVZ tackles memory management in a different way, so that it can “ burst” RAM and free up other extra resources when nodes are underused. Burst RAM is RAM that is made available assuming it is not used by another task/user and is therefore not reliably available. Another frequently mentioned disadvantage is the fact that the amount of memory an application is allocated can differ to the amount of memory an application uses in that there is less memory than promised. Xen Servers to the contrary provide an absolute and dedicated resource limitation. As a result the resources cannot be over-committed. |
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