Parallels Workstation

Infobox_Software
name = Parallels Workstation



caption = OS/2 Warp Server and Xandros running simultaneously in Windows XP via Parallels Workstation for Windows.
developer = Parallels, Inc.
latest_release_version = 2.2.2222
latest release date = release date|2008|01|31
operating_system = Microsoft Windows, Linux
platform = x86-compatible
genre = Virtual machine
license = Commercial Proprietary
website = [http://www.parallels.com/en/products/workstation/ Parallels Worksation ]

Parallels Workstation is the first commercial software product released by Parallels, Inc., a developer of desktop and server virtualization software. The Workstation software consists of a virtual machine suite for Intel x86-compatible computers (running Microsoft Windows or Linux) (for Mac version, see Parallels Desktop for Mac) which allows the simultaneous creation and execution of multiple x86 virtual computers. The product is distributed as a download package.

Implementation

Like other virtualization software, Parallels Workstation uses hypervisor technology, which is a thin software layer between Primary OS and host computer. The hypervisor directly controls some of the host machine's hardware resources and provides an interface to it for both virtual machine monitors and primary OS. This allows virtualization software to reduce overhead. Parallels Workstation's hypervisor also supports hardware virtualization technologies like Intel Virtualization Technology ("VT") and AMD Secure Virtual Machine ("SVM").

Functionalities

Parallels Workstation is a hardware emulation virtualization software, in which a virtual machine engine enables each virtual machine to work with its own processor, RAM, floppy drive, CD drive, I/O devices, and hard disk – everything a physical computer contains. Parallels Workstation virtualizes all devices within the virtual environment, including the video adapter, network adapter, and hard disk adapters. It also provides pass-through drivers for parallel port and USB devices.

Because all guest virtual machines use the same hardware drivers irrespective of the actual hardware on the host computer, virtual machine instances are highly portable between computers. For example, a running virtual machine can be stopped, copied to another physical computer, and restarted.

Parallels Workstation is able to virtualize a full set of standard PC hardware, including:cite web |url=http://www.parallels.com/files/upload/Parallels_Workstation_2_2_User_Guide.pdf |title=Virtual Machine Equipment |format=PDF |work=Parallels Workstation 2.2 User Guide |publisher=Parallels, Inc |accessdate=2007-09-27]

* A Pentium or AMD Duron processor
* A generic motherboard compatible with Intel i815 chipset
* Up to 1.5GB of RAM (even though the real i815 only supports 512 MB)
* VGA and SVGA video cards with VESA 3.0 support
* A 1.44 MB floppy drive, which can be mapped to a physical drive or to an image file.
* Up to four IDE devices. This includes virtual hard drives that range in size from 20 MB to 128 GB each and CD/DVD-ROM drives. IDE devices can be mapped to physical drive or to an image file.
* Up to four serial ports that can be mapped to a real port, to a pipe or to an output file.
* Up to three bi-directional parallel ports, each of which can be mapped to a real port, to a real printer or to an output file.
* An Ethernet virtual network card compatible with Realtek RTL8029(AS).
* 2-port USB 1.1 controller.
* An AC97 compatible sound card.
* A 104-key Windows enhanced keyboard and a PS/2 wheel mouse.

Known issues

Known limitations of Parallels Workstation, as of March 2008, include the following:

* Can only run 32-bit operating systems.cite web |url=http://kb.parallels.com/faq/6/2/417/#417 |title=Does Parallels Workstation 2.2 support 64-bit platforms? |publisher=Parallels, Inc |accessdate=2007-09-27 |work=Parallels FAQ - Getting Parallels Workstation 2.2 installed]
* Inability to assign multiple CPUs to your virtual machine to gain additional performance for CPU-intensive workloads.cite web |url=http://kb.parallels.com/faq/6/2/414/#414 |title=Does Parallels Workstation offer SMP support? |publisher=Parallels, Inc |accessdate=2007-09-27 |work=Parallels FAQ - Getting Parallels Workstation 2.2 installed]
* DVD/CD-ROM "pass-through" access has not been implemented, which means that it is impossible to use DVD and CD burners exclusively in guest virtual machines.cite web |url=http://kb.parallels.com/en/4965 |title=How can I use my host CD/DVD recorder inside a guest OS? |publisher=Parallels, Inc |accessdate=2008-08-08 |work=Parallels FAQ - Using hardware devices]
* Supported memory limit for all virtual machines is 4 GB, and memory limit for a single virtual machine is 1500 MB.
* Devices such as USB mice, memory keys, webcams, and mobile phones have been cited on the company's support forum as not working correctlyFact|date=February 2007. The support team has promised to fix some of these issues, but has not indicated when users can expect a fix.
* Network emulation does not support NATcite web |url=http://forum.parallels.com/showthread.php?p=29315&highlight=NAT |title=Need integrated NAT (internet access) |accessdate=2007-09-27] .

See also

* VMware Workstation
* Comparison of virtual machines for a list of related virtualization software products
* Hypervisor
* Virtual appliance
* Virtual machine
* Virtualization
* X86 virtualization

References

External Links

[http://www.parallels.com/en/products/workstation/ Official webpage]