Citrix Xen is a popular hypervisor
platform which is designed to help you create and manage virtualized server
infrastructure. This hypervisor platform was designed by the Citrix Systems and
has been built on the Xen hypervisor. The Citrix Xen provides monitoring
services and server virtualization. It can be found in 64-bit hypervisor
platform and good thing is that it can be successfully executed on all
processors from the x86 series.
What Citrix Xen Can Do
The platform offers good performance
for client operating systems and baremetal virtualization performance for
virtualized servers. It works by using the Xen hypervisor for virtualization of
every server on which it is installed. That enables each server to host several
virtual machines at the same time, providing fast and efficient performance.
The Citrix Xen can also be used for combining several Xen-enabled servers into
one strong resource pool, by using resource clustering and shared storage
architectures. By doing so, Citrix Xen is
extending the primary single-server notion of virtualization for enabling
smooth virtualization of several servers as one resource pool. Its memory, CPU,
storage and networking resources can be controlled dynamically for best
performance, increased availability, and optimal use of data center resources.
often skilled IT technicians and managers are using the Citrix Xen server for
creating numerous clusters of resource pools. Then they manage those clusters
and all their resources from a single spot for control. With Citrix Xen,
several servers can become very helpful in protecting key application
workloads. They can do that by using industry standard storage architectures.
Great thing about Citrix Xen is that there is no downtime maintenance when you
move virtual machines when they are running among machines within the cluster.
The Citrix Xen cluster is extending the strongest abstraction – storage,
virtualization across servers and networking. All of that is done so the users
can realize the entire potential of the responsive, dynamic and very efficient
data environment for Linux and Windows workloads.
the component for virtual machine monitoring, Citrix Xen can manage the
allocation and proper distribution of resources among many different virtual
machines. It also administers their optimal performance and usage. Although it
does sound a bit complicated, the IT managers know how to properly utilize
Citrix Xen. This is an interesting subject that requires deeper insight for
those that want to work with it. Get informed about Citrix Xen and put it in
offers different services to businesses such as application, networking,
virtualization or server. It helps businesses grow and expand on the market.
There are three different branches of Citrix – Analytics, Networking and
Workspace. In the past they offered remote access to some products of the Xen
brand, but that stop when they made rebranding back in 2018. Products like
XenApp, Xen Mobile and XenDesktop were renamed, but still provided the same
services. The Virtual Desktops of Citrix now allow remote access to desktop,
while Virtual Apps offer apps support. The hypervisor is the server
virtualization platform that provides access to better desktop and app
performance. Endpoint Management is also part of Citrix and that is the
solution for mobility management.
What Does Citrix Mean and What Is Used For
Citrix or Citrix Server is referring
to the line of virtualization products –
XenApp and Xen Desktop. The IT departments within companies can use these
products for hosting centralized applications and desktops. They enable the
users to access them from anywhere, regardless of the hardware they are
currently using. XenApp and XenDesktop are ideal for cutting costs and
increasing security, but without compromising the standardized environment.
With Citrix Server, businesses need to upgrade the operating system or an
application just once instead of presenting new versions to users. The XenApp
virtualizes single applications, while XenDesktop usually virtualizes Windows
desktop, but it can also be a Linux or Mac desktop.
are many advantages and benefits that come with using Citrix. One of the main
advantages is that those organizations that have versatile environments can use
the same applications. Users that have Linux, Windows or Mac desktops can have
standard environments. Besides that, Citrix also offers quality mobile clients
and their virtualized desktops support mobile users. An example of its use is
on this site. Specific industries like the medicine can
significantly increase their security if they choose to store sensitive data on
the server instead on devices that can be stolen such as laptops.
were some things in favor of using Citrix and the mentioned technology will
continue to dominate in the upcoming years. Many companies are opting for its
solutions because they are very helpful for specific industries. If you want to
gain a more thorough knowledge into what Citrix is all about and what it is
used for, it is advisable you get in touch with IT experts to give you best
explanations about what it can do for you.
stands for Amazon Web Services and the question whether AWS uses Xen supervisor
intrigues many people. Truth is that AWS is changing its tune because the new
hypervisor plan is the way to go in the future. At the moment AWS uses a
customized version of the popular Xen hypervisor. It takes advantage of the
feature called paravirtualization because the paravirtualized guests are
strongly relying on the Xen hypervisor for support of actions that usually
require privileged access. The CPU has four different privilege modes – between
0-3 are called rings. Ring 0 is the one with highest privilege which is
executed by the host OS. However, instead of executing in Ring 0 like most OS
do, the guest OS is running into Ring 1 and the other applications in the
lowest Ring 3. This virtualization of the resources points to clear separation
between the hypervisor and the guest, which results in added security between
What Goes On At the Moment?
AWS has added brand new hypervisor,
but truth is that customers will likely not notice huge impact when working in
their cloud environment. The AWS now has KVM
based hypervisor. It uses multi-hypervisor tactics by utilizing both Xen and
KVM, depending on the specific requirements. AWS claim that they do not have
any issues with Xen, they do continue to invest in it, but are seeking other
options as well. All future platforms are expected to be used with best virtualization
technology available. AWS plans to launch platforms which are built both on Xen
and the KVM platform. The addition of KVM is interesting, but it is not very known
whether this has any impact on the customers.
AWS is juggling between Xen and other
hypervisors for different instance types, and they are the only big services
provider that still use Xen. The reason why they are using KVM is to cut some
costs for development and support. After using Xen over a decade, AWS is
challenged to transfer everything to KVM, but they are still not completely
abandoning Xen. They are still working on many details that need to be
perfected first. The AWS tools for cloud management must go towards new
direction and evolve into multi-hypervisor. The new hypervisor will likely fit
well with AWS hardware and will provide optimized security features and
performance, but the final consumers will likely not notice any big difference.
Project is open source baremetal hypervisor, integral part of the Linux kernel
and available in Linux systems. It is one of the numerous projects that are
handled by Linux Foundation.
Components of Xen Project
Xen-running environment is consisted of few different parts. There is a Domain
0, which is the way in which you call the operating system of the host.
However, it is not a typical host OS because other virtual machines are not
required to use it in order to gain access to the hardware of the host server.
The so-called Domain 0 is
only responsible for drivers` access, and if there is a need for some type of
coordination then that will be properly handled by this Domain 0. Besides
Domain 0, there are other virtual machines that are called Domain U.
The Xen Project hypervisor can run
many different operating systems on a single host or a machine. It is the one
and only type 1 hypervisor that can be used as open source. Xen Project is
typically used as a base for many different open source and commercial
applications like desktop virtualization, server visualization, embedded
Infrastructure as a Service, security applications and hardware appliances. A
thing worth knowing is that Xen Project powers the biggest clouds you can find
in production today.
The main features of the Xen Project
hypervisor are the following:
Paravirtualization is one key
component through which the optimization is used so the paravirtualized guests
run as virtual machines. That enables them to run faster in comparison to
running wits some hardware extensions. Besides that, Xen Project hypervisor can
run even on hardware that is not supportive of virtualization extensions.
Driver Isolation is another main
feature. The hypervisor allows the driver of the main device to run inside the
virtual machine. In case the driver is compromised or crashes, then the virtual
machine that has the driver can be restarted and the driver will reboot without
affecting or having any influence on other parts of the system.
The hypervisor has small interface
and footprint, which is less than one megabyte in size. This is because it uses
microkernel design and that leaves tiny memory footprint. That makes it more
secure and more robust in comparison to other hypervisors.
Finally, operating system agnostic
is another top feature. Many installations use Linux as their domain 0, but
here many other operating systems can be used, such as OpenSolaris and NetBSD.