Virtual Private Server Technology

ZZ Servers virtual private servers (VPS) are powered by Xen. Xen VPS hosting is also known as XenSource and is a solution to managing VPS. It is a new type of web hosting based on the concept of partitions on mainframes and advanced resource scheduling and monitoring to divide a computer into many virtually isolated servers. A VPS is a server that runs inside another server. Each VPS acts like a dedicated server but shares the same hardware. Because of this, many servers can share the resources of hardware more efficiently.

Virtual private servers or virtual dedicated servers are a form of virtualization that splits a single physical server into multiple independent virtual servers. The practice of partitioning a single server so that it appears as multiple servers has long been common practice in mainframe computers but has seen resurgence lately with the development of software and technologies such as Xen and VMware. Virtual private servers have also become popular for their ability to establish secure sandboxes. For example, a single physical server may have two virtual private servers running: one hosting the production or live Web site and a second testing copy. When updates to crucial parts of software need to be made, they can be tested in the second VPS, allowing detailed testing to be conducted without requiring several physical servers and protecting the production version.

Xen is an open-source virtual machine manager, called a hypervisor, developed by the University of Cambridge. Xen provides secure server isolation, resource control with quality-of-service guarantees, and live migration of virtual machines between independent servers. Operating systems are to be explicitly modified to run on Xen, although compatibility is maintained for user applications. This modification enables Xen to achieve high-performance bare-metal virtualization without special hardware support.

Virtual private servers powered by Xen use a technique called paravirtualization to achieve high performance, with near-native performance for virtual servers with up to 10 times less overhead than other platforms.

Lean and Secure

Xen is exceptionally lean: less than 50,000 lines of code. That translates to extremely low overhead and near-native performance for guests. Xen reuses existing device drivers (both closed and open source) from Linux, making device management easy. Moreover, Xen is robust to device driver failure and protects both guests and the hypervisor from faulty or malicious drivers.

Fastest Live Relocation

Xen's live relocation capability, combined with its extraordinary performance, has led analysts to pronounce it the first virtualization technology capable of being deployed in the heart of the data center, bringing the benefits of server consolidation and increased utilization to the vast majority of servers in the enterprise.

Utility Based Computing

Xen is a key enabler in moving enterprises towards a utility-based computing model in which any server can run any operating system and any application, at any time, with dynamic load balancing of resources both within each server, between the guests, and across servers.

Per VM Resource Guarantees

Xen provides superb resource partitioning for CPU, memory, and block and network I/O. This resource protection model leads to improved security because guests and drivers are DoS-proof. Xen is fully open to scrutiny by the security community and its security is continuously tested. Xen is also the foundation for a multilevel secure system architecture being developed by XenSource, IBM, and Intel.

An Emerging Open Industry Standard

Xen enjoys extraordinary community support. It is a de facto, industry-endorsed, open source virtualization standard backed by the leading enterprise solution vendors.

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