Security and Usability

According to Citrix, users can roam from device to device, authenticating themselves via XenDesktop’s SmartCard support, and access their desktops no matter what the capabilities of the “endpoint device” are. If a thin client doesn’t have the power to run desktops locally, the desktops run remotely and are sent to the user via “screen scraping.”

On the other hand, if the thin client is an x86 device, desktops — constituting images of both a Windows XP operating system and any applications that have been installed into it — can be streamed to it and will run locally, “leveraging distributed processing power.” Citrix doesn’t specify, however, whether the thin clients had to be booted into Windows in the first place, or if Linux-based x86 systems also quality.

Meanwhile, Citrix also touts its HDX (high-definition user experience), a set of technologies that’s said to enhanced multimedia performance on thin clients. The HDX allows users to work with USB devices locally, and tap into a thin client’s 3D hardware, if present. Via “HDX MediaStream” technology, compressed a/v information — including DiVX, a variety of MPEG flavors, WMV, WMA, and MP3 — is sent to a thin client in its native format, and decompressed locally, the company adds.

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Features : XenServer 5.6

XenServer 5.6 contains several highly-requested new features:

• Granular Role-based Access Controls. Administrative users can be assigned one of several roles, which govern the actions they are able to complete from XenCenter and the command-line interface (CLI).
• Administrative Logging and Audit. Administrative changes made from XenCenter or the CLI are logged and available in the Workload Reports in XenCenter.
• Dynamic Memory Control. This feature can increase the number of VMs per host by permitting the memory utilization of existing VMs to be compressed so that additional VMs can boot on the host.
• Enhanced VM Snapshots. It is now possible to create full VM snapshots including the disk and memory state. Virtual machines can be easily rolled back to prior snapshot states with a "revert to snapshot" option.
• Automated Workload Balancing & Power Management. Workload balancing (WLB) recommendations can be applied automatically without administrative intervention. Power Management features include support for wake-on-LAN and vendor-specific implementations from HP, Dell, and others.
• StorageLink Site Recovery. Enhanced integration with storage-level replication enables recovery of an entire virtual infrastructure at a secondary disaster recovery site.
• Citrix License Server integration. Essentials for XenServer features are now activated using a license applied to a Citrix Licensing Server.

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XenServer 5.6

XenServer 5.6 delivers enhanced virtualization management capabilities for both the free XenServer, as well as the more advanced Enterprise and Platinum editions. The new low-priced XenServer Advanced Edition makes it easier and more cost-efficient for enterprise and cloud customers running free XenServer to add more advanced high availability and management capabilities.

XenServer 5.6 is available immediately. The new XenServer Advanced Edition is $1,000 per server, or $30 per month for cloud service providers. The Enterprise and Platinum editions are $2,500 and $5,000 per server, respectively.

Features

1. XenServer hypervisor
2. XenMotion® live migration
3. VM Disk Snapshot and Revert
4. XenCenter multi-server management
5. Resilient distributed management architecture
6. Conversion tools etc...

Now you can Buy Software of these kinds online on many websites e.g. http://www.softwareforless.com/. Delivery Center, composed of XenDesktop, Citrix XenApp, Citrix XenServer and NetScaler, virtualizes servers, desktops and applications, centralizes them in the data center and broadcasts them as an on-demand service.

Citrix XenServer Architecture

The XEN (virtual machine monitor) is an open-source project that is was developed in the computer laboratory of the University of Cambridge, UK.
A Xen virtual environment consist of several items that work together to deliver the virtualization environment a customer is looking to deploy,The Xen hypervisor is the basic abstraction layer of software that sits directly on the hardware below any operating systems. It is responsible for CPU scheduling and memory partitioning of the various virtual machines running on the hardware device. The hypervisor not only abstracts the hardware for the virtual machines but also controls the execution of virtual machines as they share the common processing environment. It has:

Xen Hypervisor
Domain 0
DOM U PV Guest
DOM U HVM Guest
Xen DM&C
Xen Architecture Overview 4
no knowledge of networking, external storage devices, video, or any other common I/O functions found on a computing system

• Xen Hypervisor
• Domain 0
• Domain Management and Control (Xen DM&C)
• Domain U (Dom U) PV Guest
• Domain U (Dom U) HVM Guest
• The diagram below shows the basic organization of these components.
  
  

• Supports both Paravirtualized and fully virtualized guests
  • Every major x86 OS going forward can be Paravirtualized on XenServer
    • Any Enlightened Windows Guest
    • Solaris 10 x86, RHEL,

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XenServer

XenServer is the enterprise-ready, cloud-proven virtualization platform that contains all the capabilities required to create and manage a virtual infrastructure. It is trusted by demanding organizations to run the most mission critical applications and used by the largest clouds and xSPs. XenServer:

* Reduces costs by consolidating servers and reducing power, cooling, and datacenter space
needs
* Increases IT flexibility by allowing the provisioning of new servers and IT services within
minutes
* Ensures that application requirements and performance levels are always met
* Minimizes downtime by reducing the impact of failures and protecting against disasters

The free edition of XenServer starts with a 64-bit hypervisor and centralized management, live migration, and conversion tools to create a virtual platform that maximizes guest density and performance. The premium editions of XenServer extend the platform to enable organizations of any size to integrate and automate management processes, delivering a virtual datacenter solution.


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XenDesktop 4 enhancements

Driving desktop virtualization to mainstream adoption requires a solution that is built with an open architecture and has an ecosystem of solutions that work with it. This combination enables customers to implement an end-to-end solution to replace their old and outdated desktop computing environments. XenDesktop 4 is the only open desktop virtualization platform on the market that is able to work with multiple virtualization hosting platforms, application delivery solutions and endpoint devices.



The Citrix Ready Open Desktop Virtualization Program leverages the XenDesktop open architecture, allowing customers to choose from a variety of trusted technology providers in order to simplify their virtual desktop deployments.

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Citrix XenDesktop 4

Citrix Systems' XenDesktop 4 is a VDI offering that should work in most enterprises. This is because it offers certain key capabilities, including the following:

• Automated provisioning for users, applications and desktops
• The ability to monitor and report on service levels
• Image management for virtual and physical desktops
• Administrator-defined profiles
• Support for multiple virtual machine infrastructures
• The ability to deploy Microsoft Office applications over the LAN
• A high-definition, high-speed experience, regardless of the network
• Multiple delivery models for applications and desktops
• Delivery of applications and desktops based upon defined user roles
• Integrated access control based on policies

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Citrix Xendesktop architecture

Citrix’s XenDesktop architecture stores all virtual desktops on a centrally managed XenServer, represented by the boxes at the right of the above image. The company says its newly released Xenserver 5 offers “bare metal” performance, and can host twice the number of virtual desktops as previous versions.

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Citrix Xenapp UNIX version

Presentation Server for UNIX is available for Solaris (SPARC and x86), AIX, and HP-UX. Patches typically come out first for the Solaris version. The product started as MetaFrame for Solaris 1.0 which was released in March 2000.

MetaFrame for UNIX (MFU) 1.1 added support for AIX and HP-UX and came out in the fall of that year and Feature Release 1 came out about a year later. The next version came out in the first half of 2003. It was originally planned as MFU 1.1 Feature Release 2 but was rebranded MetaFrame Presentation Server for UNIX 1.2.

However, references to MFU 1.1. FR2 can still be found (e.g. in the license key). Presentation Server for UNIX (PSU) 4.0 was released in the first half of 2005 and was the first version to be bundled with the Presentation Server suite.

Existing customers paying for upgrades and new versions (known as Subscription Advantage) can however continue to get just the UNIX version. Existing MFU 1.x installs cannot be upgraded to PSU4; instead a clean install is required.

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Citrix XenApp Fundamentals

Citrix XenApp Fundamentals enables five to 75 persons to remotely use corporate Windows programs conveniently and securely over the Web. Unlike other remote access alternatives, it performs well across slow connections, strict network firewalls, and non-Windows computers without needing to rewrite applications, upgrade computers, or increase bandwidth.

Its simple role-based rules control which central resources individuals see and where they store and print sensitive information. Newly arriving Internet and internal LAN users are automatically load-balanced among available application servers, providing users application access seamlessly from anywhere at any time. The product comes with or without Microsoft Terminal Server Client Access Licenses (CALs).

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Citrix XenDesktop

Citrix XenDesktop virtualizes desktops and delivers them to users on any device. With XenDesktop, the user's virtual desktop environment is dynamically assembled to optimize the virtual desktop infrastructure (VDI). This technology of Citrix ensures that users receive a no-compromise experience that is indistinguishable from a locally installed desktop. You can buy software of all of these kinds online

Access from anywhere

Users access their virtual desktops from almost any corporate PC, thin client, Mac, netbook, or smartphone, using Citrix Receiver™. Once they authenticate, users will get the same, high-performance virtual desktop every time.

Dynamic desktop assembly

Each user’s desktop can leverage virtualization to separate the OS, applications, and user personalization settings. Each element can be dynamically combined for each user session, ensuring that users receive the most up-to-date, pristine version of each.

Delivered with HDX technology

For hosted desktops, HDX user experience technologies ensure high-performance, rich graphics, broad support for USB devices, seamless multimedia and more—over the LAN, WAN, Internet, or wireless network.

Other famous products of Citrix are Citrix Xenapp Fundamentals and Citrix Xenapp version 6. Moreover Citrix HDX technology provides a broad set of capabilities to ensure that users receive the best high-definition experience for virtual desktops. HDX has a unique capability to dynamically assess the capabilities of the endpoint, network, and datacenter, and take advantage of processing power wherever it makes the most sense.

A brief Introduction of Citrix Compnay

Citrix Systems was born from the idea of unlocking applications from datacenters, and employees from the office – changing the way IT and people work. Today, this is the promise of virtual computing, and Citrix is at the epicenter.

In the world ahead, the better way to work is virtual – completely untethered from the office, devices, networks and datacenters. This virtual workstyle creates new possibilities for personal efficiency and business speed. The world’s smartest organizations are discovering that “going virtual” is how to stay ahead in a business world that’s changing faster than ever.

Virtualization goes far beyond just consolidating servers. It’s also about powering the cloud, enabling online collaboration from anywhere, and taking desktop computing to an entirely new level. It’s about elevating IT from managing equipment and systems, to enabling them to deliver computing as an on-demand service. For our customers, it’s about unleashing the productivity and creativity of people, allowing them to seize business opportunity ahead of competitors.

By applying our virtual computing vision to everything from meetings to desktops, networks and clouds, computing can be far simpler. Our belief in the power of simplicity becomes more market-relevant every day and is the basis for how Citrix will continue to drive long-term value for shareholders, employees, customers and partners.

The more focused products of Citrix are Citrix Xendesktop, Citrix Xenapp Fundamentals and Citrix Xenapp version 6. More than 230,000 organizations worldwide rely on Citrix to help them build simpler and more cost-effective IT environments enabling virtual workstyles for users and virtual datacenters for IT. Citrix partners with over 10,000 companies worldwide in more than 100 countries. Founded in 1989, annual revenue in 2009 was $1.61 billion. You can Buy Software of these kinds online on many websites e.g. http://www.softwareforless.com/.