- OS/390
OS/390 is an IBM
operating system for theSystem/390 IBM mainframe computers.OS/390 was introduced in late
1995 in an effort, led by the late Randy Stelman, to simplify the packaging and ordering for the key, entitled elements needed to complete a fully functionalMVS operating system package. These elements included, but were not limited to:*
DFP - Data Facility Product (Providesaccess method s to enable I/O toDASD subsystems and Tape)
*JES - Job Entry Subsystem (Provides ability to submit batch work and manage print)
*CommServer - Communications Server (ProvidesVTAM andTCP/IP communications protocols)An additional benefit of the OS/390 packaging concept was to improve
reliability, availability and serviceability (RAS) for the operating system, as the number of different combinations of elements that a customer could order and run was drastically reduced. This reduced the overall time required for customers to test and deploy the operating system in their environments, as well as reducing the number of customer reported problems (PMR s), errors (APAR s) and fixes (PTF s) arising from the variances in element levels.In December
2001 IBM extended OS/390 to include support for 64-bitzSeries processors and added various other improvements, and the result is now named z/OS. IBM ended support for the older OS/390-branded versions in late2004 .ee also
*
OS/360
*MVS
*z/OS
*z/TPF
*z/VM
*z/VSE
*Linux on zSeries References
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