Model 204 system requirements
Operating system support
Model 204 Release V7.5
Release V7.5 is supported on the following operating system environments:
- IBM z/OS versions 1.09 through 2.1
- IBM z/VM versions 5.3 and 5.4
- IBM z/VSE version 4.2.1
Model 204 Release V7R4
Release V7.4 is supported on the following operating system environments:
- IBM z/OS versions 1.09 through 2.1
- IBM z/VM versions 5.3 and 5.4
- IBM z/VSE version 4.2.1
Model 204 Release V7R1
Release V7.1 is supported on the following operating system environments:
- IBM z/OS versions 1.09 through 2.1
- IBM z/VM versions 5.3 and 5.4
IBM z/VSE is not supported.
z/OS 2.1 compatibility issues
In Model 204 versions 7.5 and lower, Horizon TCP applications sending data larger than 16K might get the following error:
M204.1254: User language statement is invalid in this conversation state
This error occurs under z/OS version 2.1 because the TCP Default Send Buffer Size (DefaultSndBufSize) was increased to 65536 (from 16384 in earlier versions).
Solution
- Model 204 v7.5:
Apply zap 75Z226. - Model 204 v7.4:
Currently fixed by zap 74Z4552. Contact Model 204 support. - Model 204 v7.1 (and lower):
Workaround: Set z/OS 2.1 TCP DefaultSndBufSize to 16384.
Hardware requirements
Model 204 requires the IBM zSeries processors listed below for each Model 204 release.
Model 204 Release V7.5
Model 204 version 7.5 requires the IBM z/890 or above processor, except for the following feature:
- The large (1 MB) page support feature requires the IBM z10 or above processor.
Model 204 Release V7.4
Model 204 version 7.4 requires the IBM z/890 or above processor, except for the following feature:
- The large (1 MB) page support feature requires the IBM z10 or above processor.
Model 204 Release V7.1
Model 204 version 7.4 requires the IBM z/890 or above processor.