Dave Kopischke wrote:
I knew I didn't dream this:
http://www.redbooks.ibm.com/redbooks/pdfs/sg245976.pdf
OS/390 supports the coexistence of up to four consecutive releases. While
the
four-release coexistence policy applies to JES2, the fact that a JES2
installation
can be staged has been taken into account in determining which are the four
consecutive releases that can coexist. If a JES2 release is functionally
equivalent
to its predecessor (that is, its FMID did not change), then from a
coexistence
standpoint, it is considered the same release.
--------------- and --------------
Coexistence support for OS/390 Release 10 exists for the following lower-
level
OS/390 releases:
• OS/390 R6
This is a deviation from the normal four-release coexistence policy, but is
still
in use because the Y2K actions took many customers only up to Release 6.
• OS/390 R7
• OS/390 R8
• OS/390 R9
[...]
There are (were) more deviations than strict rules. OS/390 2.6-2.10
coexistence, common EOS for z/OS 1.4 and 1.5, irregular GA dates for
z/OS (1.5 year between 1.4 and 1.5), change from semi-annual to annual
releases, I also vaguely recollect some deviation in OS/390 V1 times.
Oh, I forgot OS/390 V2R10 coexistence rule: it was treaten as z/OS V1R1...
Deviations everytime! (and deviants everywhere <g>).
--
Radoslaw Skorupka
Lodz, Poland
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