BS2000 is a mainframe computer
Mainframe computer
Mainframes are powerful computers used primarily by corporate and governmental organizations for critical applications, bulk data processing such as census, industry and consumer statistics, enterprise resource planning, and financial transaction processing.The term originally referred to the...

 operating system
Operating system
An operating system is a set of programs that manage computer hardware resources and provide common services for application software. The operating system is the most important type of system software in a computer system...

 developed by Fujitsu Technology Solutions
Fujitsu Technology Solutions
Fujitsu Technology Solutions is one of the leading European IT vendors with a presence in all key markets in Europe, the Middle East and Africa, plus India...


Unlike other mainframe systems, BS2000/OSD provides exactly the same user and programming interface in all operating modes (batch, interactive and online transaction processing) and regardless of whether it is running natively or as a guest system in a virtual machine
Virtual machine
A virtual machine is a "completely isolated guest operating system installation within a normal host operating system". Modern virtual machines are implemented with either software emulation or hardware virtualization or both together.-VM Definitions:A virtual machine is a software...

. This uniformity of the user interface and the entire BS2000 software configuration makes administration and automation particularly easy.


Looking back over the history of its development, BS2000/OSD has its roots in the TSOS operating system (TSOS: Time Sharing Operating System
Time Sharing Operating System
Time Sharing Operating System, or TSOS, was an operating system for RCA mainframe computers of the Spectra 70 series.RCA was in the computer business until 1971. Then it sold its computer business to Sperry Corporation; Sperry offered TSOS renaming it to VS/9...

) first developed by RCA
RCA Corporation, founded as the Radio Corporation of America, was an American electronics company in existence from 1919 to 1986. The RCA trademark is currently owned by the French conglomerate Technicolor SA through RCA Trademark Management S.A., a company owned by Technicolor...

 for the /46 model of the Spectra/70
RCA Spectra 70
The RCA Spectra 70 was a line of electronic data processing equipment manufactured by the Radio Corporation of America’s computer division beginning in April 1965...

 series, a computer family of the late 1960s related in its architecture to IBM
International Business Machines Corporation or IBM is an American multinational technology and consulting corporation headquartered in Armonk, New York, United States. IBM manufactures and sells computer hardware and software, and it offers infrastructure, hosting and consulting services in areas...

’s /360 series. It was one of the very first operating systems in which the principle of virtual addressing and a segregated address space
Address space
In computing, an address space defines a range of discrete addresses, each of which may correspond to a network host, peripheral device, disk sector, a memory cell or other logical or physical entity.- Overview :...

 for the programs of different users was systematically introduced.
Right from the outset TSOS also allowed the data peripheral
A peripheral is a device attached to a host computer, but not part of it, and is more or less dependent on the host. It expands the host's capabilities, but does not form part of the core computer architecture....

s to be accessed only via record- or block-oriented file interfaces, thereby preventing the necessity to implement device dependencies in user programs.



BS2000 V1.0 – Porting of the TSOS operating system to models of the Siemens
Siemens may refer toSiemens, a German family name carried by generations of telecommunications industrialists, including:* Werner von Siemens , inventor, founder of Siemens AG...

 system 7.700


BS2000 V2.0 – In June 1975, Siemens shipped the enhanced version of the TSOS operating system for the models of the Siemens 7.700 mainframe series for the first time under the name BS2000. Even this first BS2000 version supported disk paging
In computer operating systems, paging is one of the memory-management schemes by which a computer can store and retrieve data from secondary storage for use in main memory. In the paging memory-management scheme, the operating system retrieves data from secondary storage in same-size blocks called...

 and three different operating modes in the same system: interactive dialog, batch, and transaction mode, a precursor of Online Transaction Processing (OLTP mode).


The TRANSDATA communication system marked the entry into modern computer networking.


The introduction of multiprocessor
Multiprocessing is the use of two or more central processing units within a single computer system. The term also refers to the ability of a system to support more than one processor and/or the ability to allocate tasks between them...

 technology brought an improvement in system availability. From that moment on, the operating system had the ability to cope with a processor failure. At the same time the new technology considerably extended the performance range of the system.


A transaction processing monitor, the Universal Transaction Monitor (UTM), was introduced, providing support for online transaction processing as an additional operating mode, and one particularly important for mainframes.



Introduction of the Siemens system 7.500 hardware family, ranging from desk size models for use in office environment to large models with water cooling.


BS2000 V9.0 – BS2000 is ported to the /370 architecture and now supports 2GB address space
Address space
In computing, an address space defines a range of discrete addresses, each of which may correspond to a network host, peripheral device, disk sector, a memory cell or other logical or physical entity.- Overview :...

s, 512 processes
Process (computing)
In computing, a process is an instance of a computer program that is being executed. It contains the program code and its current activity. Depending on the operating system , a process may be made up of multiple threads of execution that execute instructions concurrently.A computer program is a...

 and the XS channel system (Dynamic Channel Subsystem).
BS2000 is subdivided into subsystems that are strongly decoupled from one another. This increases flexibility for ongoing development and in shipment of software.



With the advent of the VM2000
VM 2000 is a hypervisor from Fujitsu Siemens Computers designed specifically for use with the BS2000 and SINIX operating systems. It is an EBCDIC-based operating system. It allows multiple images of BS2000 and/or SINIX to operate on a S- or SX-series computer, which is based on the IBM...

 virtual machine, multiple BS2000 systems, of the same or different versions, can now run in parallel on the same computer. The new hierarchical storage management system HSMS automatically swaps out infrequently used data to cheaper storage media. As soon as this data is needed again, it is restored, again automatically, to high-speed access media. The MAREN tape archiving system supports the connection of robot systems.


Computer security
Computer security is a branch of computer technology known as information security as applied to computers and networks. The objective of computer security includes protection of information and property from theft, corruption, or natural disaster, while allowing the information and property to...

 evaluation to F2/Q3 completed.

1992 / 1995

BS2000/OSD V1.0 – BS2000 is realigned to make it open to application software and from then on bears the name BS2000/OSD (Open Server Dimension). Full support of the XPG4 standard is achieved in 1995 after the porting of the POSIX
POSIX , an acronym for "Portable Operating System Interface", is a family of standards specified by the IEEE for maintaining compatibility between operating systems...

 interfaces in 1992.


BS2000/OSD is ported to the MIPS
MIPS architecture
MIPS is a reduced instruction set computer instruction set architecture developed by MIPS Technologies . The early MIPS architectures were 32-bit, and later versions were 64-bit...

 architecture. Although the operating system now runs on different hardware architectures (S servers with /390 architecture and SR2000 servers for the MIPS architecture), object-compatible execution is guaranteed for BS2000 applications. Applications produced for /390 can be used on computers based on MIPS architecture without recompilation.


With WebTransactions, existing BS2000 applications can be easily internet-enabled, with no need for programmer intervention in these applications.


BS2000/OSD is the first operating system worldwide to be awarded Internet Branding by The Open Group
The Open Group
The Open Group is a vendor and technology-neutral industry consortium, currently with over three hundred member organizations. It was formed in 1996 when X/Open merged with the Open Software Foundation...




BS2000/OSD is ported to the SPARC
SPARC is a RISC instruction set architecture developed by Sun Microsystems and introduced in mid-1987....

 architecture, leading to the creation of the new SX server line. This marks Fujitsu Siemens Computers’ consistent pursuit of its strategy of hardware independence while at the same time maintaining full compatibility.


Support for enterprise-wide storage area network
Storage area network
A storage area network is a dedicated network that provides access to consolidated, block level data storage. SANs are primarily used to make storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices appear like locally attached devices...

s (SANs) based on Fibre Channel technology enables throughput rates to be increased by as much as 50%.


The mainframe system celebrates its 30th birthday in July.


BS2000/OSD V7.0 – Support of new server generations, Unicode
Unicode is a computing industry standard for the consistent encoding, representation and handling of text expressed in most of the world's writing systems...

 support, improved SAN integration.


Release of the new BS2000/OSD version 7.0. Development highlights are: the Snap and Clone functionality of the EMC Symmetrix DMX storage systems made available for BS2000 files and disks;
online provisioning for pubsets (this function automatically adds disks from a free disk pool to a BS2000 file system as needed or returns disks to this pool when they are no longer required);
autonomous, dynamic control of I/O resources (IORM). Like the priority control used in the allocation of CPU timeslices, this function implements a priority control system for processes when accessing I/O resources.


BS2000/OSD is ported to the x86 architecture
X86 architecture
The term x86 refers to a family of instruction set architectures based on the Intel 8086 CPU. The 8086 was launched in 1978 as a fully 16-bit extension of Intel's 8-bit based 8080 microprocessor and also introduced segmentation to overcome the 16-bit addressing barrier of such designs...

. Introduction of the new SQ server line. Latest release notice on November 2010.


Release of the new BS200/OSD version 9.0.

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.