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Charon (software)
Charon is the brand name of a group of software products able to emulate several CPU architectures. The emulators available under this brand mostly cover the Digital Equipment DEC hardware platforms PDP-11, VAX, and AlphaServer, which support many of the legacy operating systems, including Tru64 and OpenVMS. The product range also includes virtualization solutions for HP 3000 using MPE/iX and SPARC. Charon software products have been developed by the Swiss software company Stromasys SA, which has its headquarters in Cointrin, near Geneva.
== Products and Technology ==
Even today, DEC systems are frequently used in production despite their sometimes significant age. Some companies use them to support applications that are considered mission critical, for example core applications in banks and stock exchanges, air traffic control systems or manufacturing plants. The aging hardware and changing supplier availability are making the operation of such systems on the original hardware increasingly difficult. Porting the complete solution to new hardware, new operating system, and new programming language (including libraries and interfaces) is often expensive and associated with high risk. A migration to an emulated environment constitutes an alternative solution enabling the use of modern x86 hardware or virtualized standard x86 servers, without having to abandon the fully functioning operating system and the application environment.
The virtualization solutions being sold under the product names CHARON-PDP, CHARON-AXP, CHARON-VAX, CHARON-HPA and CHARON-SSP consist of a combination of virtual machine and hardware abstraction layer. They run on Microsoft Windows, Linux or VMware ESXi and provide a virtual PDP-11, VAX, AlphaServer, HP 3000, and SPARC environment. In a first step, a configuration matching the old system is created on the host platform, thereby creating an emulated guest system behaving like the old physical server. In the second step, the operating system and - as required – associated applications and application data, are moved from the real hardware to the virtual machine. Depending on the operating system, the data is copied as physical image or file system backup. Such migrations are possible without source code changes or operating system upgrades.
In 2010, the IT market research institute Gartner called the CHARON products as leaders in the area of Alpha and VAX platform emulation. Next to Transitive (called IBM PowerVM since the take-over by IBM in 2008), Stromasys, the supplier of Charon, was also called a major player in overall mainframe emulation technology. In 2013, Stromasys was named a Gartner Cool Vendor.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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