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The following table describes the migration/coexistence
supported releases. The release shown in column 1 is the
highest release running in a multisystem confi guration.
Migration/Coexistence Supported Releases (OS/390 & z/OS)
Release Migration/Coexistence Release
z/OS R4 {z/OS.e R4, z/OS R4}, {z/OS.e R3, z/OS R3}, z/OS R2,
{z/OS R1, OS/390 R10}
z/OS.e R4 {z/OS.e R4, z/OS R4}, {z/OS.e R3, z/OS R3}, z/OS R2,
{z/OS R1, OS/390 R10}
z/OS R5 {z/OS.e R5, z/OS R5}, {z/OS.e R4, z/OS R4}, {z/OS.e R3,
z/OS R3}, z/OS R2
z/OS.e R5 {z/OS.e R5, z/OS R5}, {z/OS.e R4, z/OS R4}, {z/OS.e R3,
z/OS R3}, z/OS R2
z/OS R6 {z/OS.e R6, z/OS R6}, {z/OS.e R5, z/OS R5}, {z/OS.e R4,
z/OS R4}, {z/OS.e R3, z/OS R3}
z/OS.e R6 {z/OS.e R6, z/OS R6}, {z/OS.e R5, z/OS R5}, {z/OS.e R4,
z/OS R4}, {z/OS.e R3, z/OS R3}
z/OS R7
2
z/OS R7, z/OS R6, z/OS R5, z/OS R4
z/OS.e R7 {z/OS.e R7, z/OS R7}, {z/OS.e R6, z/OS R6}, {z/OS.e R5,
z/OS R5}, {z/OS.e R4, z/OS R4}
1. OS/390 R10 and z/OS R1 treated as one coexistence level
2. z/OS R7 is planned to be available September 2005
This information is being provided to you to facilitate
release planning and to help ensure appropriate position-
ing for future software migrations.
Note: Specifi c functions might only be available on the
up-level systems, or it might be necessary to up-level all
systems to enable some functions.
For additional information on z/OS planning, refer to z/OS
and z/OS.e Planning for Installation, available on the z/OS
Web site in the z/OS Library at: ibm.com/servers/eserver/
zseries/zos.
For the latest information regarding z/OS and OS/390
marketing and service withdrawal dates visit: ibm.com/
servers/eserver/zseries/zos/support/zos_eos_dates.html.
Migration, installation and customization enhancements
For information on migration to the latest z/OS releases,
see the z/OS Migration Web page ibm.com/zseries/zos/
migration. The publications, z/OS V1.6 Migration are avail-
able from this site for helping to plan the migration to z/OS
V1.6.
zSeries Bimodal Support for z/OS
IBM provides the z/OS Bimodal Migration Accommoda-
tion Offering to assist customers in migrating from OS/390
to z/OS. This addresses many customer requests to have
a “fallback” option to 31-bit mode when fi rst migrating to
z/OS in 64-bit mode on a z/Architecture server. IBM has
reconsidered the investment in 31-bit support on a zSeries
server to encourage our customers to move forward. This
offering is available for 6 months for each z/OS license
(5694-A01) starting from the registration of a z/OS license
to a z/Architecture server. This offering only applies to
z/OS Version 1 Releases 2, 3, and 4, and will not be pro-
vided for z/OS 1.5 or for any z/OS.e releases.
Wizards
z/OS wizards are available on the Internet to help to set
up some of the z/OS functions. These wizards are interac-
tive assistants that ask a series of questions about the
task to be performed (for example, setting up a Parallel
Sysplex environment). The wizards can simplify planning
and confi guration by exploiting recommended values and
by building customized checklists. For confi guration tasks,
these wizards also generate outputs like jobs, policies, or
parmlib members that can be uploaded to z/OS.
For more information about wizards visit the Web site at:
ibm.com/servers/eserver/zseries/zos/wizards/.