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Tags: hypervisor - VPS Host Dir - About Virtual Private Servers
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Tags: hypervisor

Citrix To Steal Attention From VMware World Europe 2009 With The Release Of Free XenServer

by vpshostdir Email


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Citrix, the producer of paravirtualization technology solution Xen hopes to attract the virtualization industry attention next week when the company is about to release for free XenServer Enterprise Edition. The virtualization software producer however will remove some features from the free software package and move them into Essentials for XenServer, an application positioned in price range $1,500 - $5,000 per server node.

Some features of the former Enterprise Edition which will note be included in the free XenServer edition include Workflow Studio orchestration (used for automating common tasks), and StorageLink. StorageLink is a set of storage integration modules which enable system administrators to provision virtual machine storage directly from the XenServer management console.

Workflow Studio and StorageLink will be added to Essentials for Hyper-V and XenServer.

According to popular media that covers virtualization industry - Virtualization.info at least "three things seem true in the virtualization industry".

The first one according to the media is that it does not matter how many times a vendor repeats that free software doesn’t compete against a feature-rich end-to-end solutions. "It will end up offering a free hypervisor", says Virtualization.info.

Alessandro Perilli, founder of Virtualization.info suggests that "it doesn’t matter how many surprises a vendor can pack for its premier conference, its competitors will do their best to steal the thunder".

The third conclusion of Mr. Perilli is that it "does not matter how many NDAs a vendor puts in place to embargo its most amazing announcement, the news will leak out even before hang up the conference call".

In an article titled "Citrix, Microsoft, and Red Hat or Novell gang up on VMware" Stephen Vaughn-Nichols said that Citrix will announce its free version of XenServer hypervisor during the VMware VMworld Europe 2009 conference.

Citrix is expected to lose some revenue with the release of free XenServer. The company plans to compensate it from increased sales of the Citrix Essentials new management package called. As mentioned above it will be available in 2 editions, which will cost between $1,500 and $5,000 per server. One of them will be for XenServer, the other one for Microsoft Hyper-V.

Industry analysts have already commented that the free version of XenServer will appeal to small and medium-sized businesses, that starting out with virtualization.

Xen Makes Possible Several OS Operate On A Physical Server

by vpshostdir Email

Xen is an unique technology, a powerful Open Source industry standard for virtualization that it a set for virtualization of x86, x86_64, IA-32, IA64, PowerPC, and other CPU architectures.

The Xen's main advantage is that it allows a several guest OS to be executed on the same physical server. It makes possible each of these OS to operate in conjunction with others on the server.

Xen system is structured with the Xen hypervisor (Virtual machine monitor) as the lowest and most privileged layer. Above this layer can work guest several OS, which the hypervisor schedules across the physical CPUs. In this software infrastructure the first OS is "domain 0" (dom0). It is booted automatically when the hypervisor boots and given special management privileges and direct access to the physical server. To start any of the other OS ("domain U" (domU)), the Xen's administrator has to log into dom0.

Those who want to use have to insert Xen's software layer between the host server's hardware and the OS. This creates an abstraction layer that allows each physical server to run one or more virtual servers effectively decoupling the OS and its applications from the underlying physical server.

Xen allows modified versions of Linux, NetBSD and Solaris to be used as the dom0. Other modified Unix-like OS can installed and executed as OS operating systems (domU). In Xen 3.0, unmodified versions of Windows can also be used as guest OS if the CPU supports x86 virtualization.

Why Xen?

Hypervisors like Xen are used by web hosting companies to provide Virtual Dedicated Servers. In general, the server virtualization allows web hosts to consolidate resources, to increase utilization, and ability to respond dynamically to any faults by re-booting virtual server or even to move it to a different hardware. In virtual environment it is also possible to securely separate virtual OS, and to support legacy software as well as new OS instances on the same server.

Xen supports live migration of a virtual server from one physical machine to another. It also allows workload balancing and avoids downtime.

Xen can be used on a PC or server that run Linux and at the same time have Windows installed. Although such systems are used in a dual boot setup, Xen makes possible to start Windows "in a window" from within Linux, and to run applications from both systems at the same time.

According to Xen's website "Xen’s paravirtualization technology is the fastest and most secure virtualization software in the industry. The producers of Xen also say that it offers "near-native performance for virtual servers with up to 10 times less overhead than proprietary offerings, and benchmarked overhead of well under 5% in most cases compared to 35% or higher overhead rates for other virtualization technologies".


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