IBM z/OS - Manual (Page 6)

6
Operating System ESA/390 z/Arch Compati Exploita
(31-bit) (64-bit) bility tion
OS/390 ® Version 2 Release 10 Yes Yes Yes No
z/OS Version 1 Release 2 No* Yes Yes No
z/OS Version 1 Release 3 No* Yes Yes No
z/OS Version 1 Release 4 No* Yes Yes Yes
z/OS Version 1 Release 5, 6 No Yes Included Included
Linux on S/390 ® Yes No Yes Yes
Linux on zSeries No Yes Yes Yes
z/VM Version 3 Release 1 Yes Yes Yes No
z/VM Version 4 Release 3 Yes Yes Yes No
z/VM Version 4 Release 4 Yes Yes Included Yes
z/VM Version 5 Release 1 (3Q04) No Yes Included Yes
VSE/ESA ™ Ver. 2 Release 6, 7 Yes No Yes Yes
z/VSE Version 3 Release 1 Yes No Yes Yes
TPF Version 4 Release 1 Yes No Yes No
(ESA mode only)
* Customers with z/OS Bimodal Migration Accommodation Offering
may run in 31-bit support per the terms and conditions of the Offering.
Bimodal Offering available for z/OS ONLY.
IBM ^ zSeries is the enterprise class e-business
server optimized for the integration, transactions and data
of the next generation e-business world. In implement-
ing the z/Architecture with new technology solutions, the
zSeries models are designed to facilitate the IT business
transformation and reduce the stress of business-to-busi-
ness and business-to-customer growth pressure. The
zSeries represents an advanced generation of servers
that feature enhanced performance, support for zSeries
Parallel Sysplex clustering, improved hardware man-
agement controls and innovative functions to address
e-business processing.
The z990 server enhances performance by exploiting new
technology through many design enhancements. With a
new superscalar microprocessor and the CMOS 9S-SOI
technology, the z990 is designed to further extend and
integrate key platform characteristics such as dynamic
fl exible partitioning and resource management in mixed
and unpredictable workload environments, providing scal-
ability, high availability and Quality of Service to emerging
e-business applications such as WebSphere ® , Java and
Linux.
The z990 has 4 models available as new build systems
and as upgrades from the z900.
The four z990 models are designed with a multi-book
system structure which provides up to 32 Processor Units
(PUs) that can be characterized prior to the shipment of the
machine as either Central Processors (CPs), Integrated
Facility for Linux (IFLs), or Internal Coupling Facilities (ICFs).
IBM ^ zSeries 990