IBM 890 manual Installation Considerations, z/OS 1.6 is supported on the following IBM servers

Installation Considerations

CustomPac is a suite of services designed to help you effi ciently install, migrate and maintain a z/OS system. It can also help with migrating and maintaining z/OS system- related products and/or third parties’ software vendor products. Options include:

•RefreshPac®, which includes preventative software services

•ProductPac® for custom-built products

•SystemPac® for installation or system replacement

Highlights

•Customized services and products to help meet cus- tomer specifi c needs

•Effi cient and effective exploitation of new z/OS functions

•A solution for businesses that lack skilled system pro- grammers

•Installation of IBM and selected third-party software vendor products in one package

z/OS.e can be ordered by ServerPac and SystemPac only.

ServerPac is a software package, available free of charge with a z/OS license, that creates or replaces a z/OS, OS/390, or z/OS.e system.

CBPDO is a no-charge software package for adding or upgrading products or services or both, on an existing z/OS systems.

z/OS 1.4 and 1.5 are supported on the following IBM servers:

•S/390 Parallel Enterprise Server™ G5/G6 (or compatible server) (ESA/390 mode)

•Multiprise® 3000 Enterprise Server (or compatible server) (ESA/390 mode)

•IBM ^zSeries 800, 890, 900 and 990 servers (or compatible servers in z/Architecture mode)

z/OS 1.6 is supported on the following IBM servers:

•IBM ^zSeries 800, 890, 900 and 990 servers (or compatible servers in z/Architecture mode)

Migration/Coexistence

General coexistence, release migrations, and fallback: z/OS continues to deliver compatibility and fl exibility as the user migrates systems in a multisystem confi guration by allowing several releases of z/OS, OS/390, and z/OS.e to coexist. This includes Parallel Sysplex and non-Parallel Sysplex multisystem confi gurations.

Coexistence allows systems within a multisystem confi gu- ration to be upgraded to a new release level of the operat- ing system one system at a time. This is contingent on the fact that the release the user is migrating to can coexist with the lowest release running in the user’s multisystem confi guration.

IBM has a consistent coexistence, migration, and fallback policy. Migration forward as well as backward should be made within the same releases supported by the coexis- tence policy.

This consistent coexistence, migration and fallback policy applies to release migrations for:

•Single system confi gurations

•Individual systems within a multisystem confi guration

•Cases where a simultaneous IPL is used to migrate all systems in a multisystem confi guration at the same time

Customers are able to upgrade to z/OS 1.6 from z/OS 1.3, 1.4 or 1.5 in a single step.

For additional information on coexistence and release migration information, refer to z/OS Planning for Installation (GA22-7504) at: ibm.com/servers/eserver/zseries/zos/ bkserv/fi nd_books.html.

81