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When planning your next release migration, you need to consider which releases
you can migrate to in a single step and what the fallback options are.
In addition, if you have more than one z/OS image, you may need to consider
the coexistence options for different releases.
The table below explains these options for the currently supported releases
of z/OS and OS/390.
Using the table below, find the release that you are currently executing in Column A. Column C,
labeled Looking forward lists the releases that can be migrated to in one step. Column B,
labeled Looking backward, lists the releases that you can fallback to. As for sharing resources
between releases:
- If the release in Column A is the highest executing release: Column B, labeled Looking
backward, lists the releases that can coexist with the release in Column A.
- If the release in Column A is the lowest executing release: Column C, labeled Looking
forward, lists the releases that can coexist with the release in Column A.
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COLUMN A
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COLUMN B
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COLUMN C
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Release
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Looking backward
(i.e. The release in column A is the
highest executing release), the
release in column A may coexist
with or fallback to:
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Looking forward
(i.e. The release in column A is the
lowest executing release), the
release in column A may coexist
with or migrate in one step to:
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OS/390 2.10
(EOS - 9/04)
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OS/390 2.9
OS/390 2.10
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OS/390 2.10
z/OS 1.1
z/OS 1.2
z/OS 1.3
z/OS 1.4
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z/OS 1.1
(EOS - 3/04)
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OS/390 2.9
OS/390 2.10
z/OS 1.1
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z/OS 1.1
z/OS 1.2
z/OS 1.3
z/OS 1.4
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z/OS 1.2
(EOS - 10/04)
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OS/390 2.9
OS/390 2.10
z/OS 1.1
z/OS 1.2
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z/OS 1.2
z/OS 1.3
z/OS 1.4
z/OS 1.5
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z/OS 1.3
(EOS - 3/05)
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OS/390 2.9
OS/390 2.10
z/OS 1.1
z/OS 1.2
z/OS 1.3
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z/OS 1.3
z/OS 1.4
z/OS 1.5
z/OS 1.6
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z/OS 1.4
(EOS - 3/07)
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OS/390 2.10
z/OS 1.1
z/OS 1.2
z/OS 1.3
z/OS 1.4
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z/OS 1.4
z/OS 1.5
z/OS 1.6
z/OS 1.7
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z/OS 1.5
(EOS - 3/07)
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z/OS 1.2
z/OS 1.3
z/OS 1.4
z/OS 1.5
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z/OS 1.5
z/OS 1.6
z/OS 1.7
z/OS 1.8
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z/OS 1.6
(EOS - 9/07)
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z/OS 1.3
z/OS 1.4
z/OS 1.5
z/OS 1.6
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z/OS 1.6
z/OS 1.7
z/OS 1.8
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z/OS 1.7
(EOS - 9/08**)
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z/OS 1.4
z/OS 1.5
z/OS 1.6
z/OS 1.7
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z/OS 1.7
z/OS 1.8
z/OS 1.9
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z/OS 1.8
(EOS - 9/09)
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z/OS 1.5
z/OS 1.6
z/OS 1.7
z/OS 1.8
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z/OS 1.8
z/OS 1.9
z/OS 1.10
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z/OS 1.9
(EOS - 9/10*)
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z/OS 1.7
z/OS 1.8
z/OS 1.9
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z/OS 1.9
z/OS 1.10
z/OS 1.11*
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z/OS 1.10
(EOS - 9/11*)
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z/OS 1.8
z/OS 1.9
z/OS 1.10
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z/OS 1.10
z/OS 1.11*
z/OS 1.12*
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Legend
*- An asterisk (*) identifies projected information — either projected dates or projected releases
of z/OS — and represent current IBM intentions.
**- IBM generally announced support for z/OS V1.7 ended on September 30, 2008.
However, IBM has announced a special extended lifecycle accommodation exclusively
for z/OS V1.7.
The
IBM Lifecycle Extension for z/OS V1.7 (5637-A01)
provides fee-based
corrective service (a fix, bypass, or restriction to a problem) for up to two years
beyond the September 30th 2008 withdrawal of service date for z/OS V1.7.
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Contact z/OS.
Send us your questions and comments.
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