IBM i5/OS

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i5/OS

Website	i5/OS
Company/ developer	IBM
Source model	Closed source
Latest stable release	V5R4 / Feb 14, 2006
Kernel type	shares many Microkernel design philosophies (SLIC)
License	Commercial
Working state	Current

i5/OS is an operating system used on IBM's line of System i (formerly known as eServer iSeries and AS/400) computers. i5/OS was formerly known as OS/400. OS/400 and AS/400 were introduced in 1988. The latest version is V5R4. OS/400 and i5/OS have built-in subsystems that provide some backward compatibility with earlier IBM general business systems, such as the IBM System/36 and IBM System/38 series. IBM designed i5/OS as a "turnkey" operating system, requiring little or no on-site attention from IT staff during normal operation. For example, i5/OS has a built-in (and quite powerful) DB2 database which does not require separate installation and maintenance. System administration has been wizard-driven for years, even before that term was defined. i5/OS is also well regarded for its tuned Java implementation, including hardware specific optimizations. Though not natively a graphical operating system, the Client Access Licensed Product includes iSeries Navigator a client based and web based version for graphical system and database administration and for the Apache web server and WebSphere Application Server, there is web based administration. i5/OS can coexist on modern System i hardware alongside AIX and Linux. The next version of i5/OS (V6R1) is slated for release in 2008. ^[1]