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...

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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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