EMS Manual

Configuring EMS
EMS Manual—426909-005
12-22
The Compatibility Distributor ($Z0)
If you omit the XPOOLPAGES parameter or the entire paragraph from the
configuration file, the primary collector buffer has 50 pages of resident extended
memory. If the file includes XPOOLPAGES, you can set n to any decimal numeral from
35 through 128; if you set n outside that range, the buffer has 128 pages. After system
generation, the value of n does not change until someone changes it and another
system generation takes place.
The Compatibility Distributor ($Z0)
Use the compatibility distributor, $Z0, to ensure that event messages generated during
system load (before any other distributors are running) are displayed.
When configured, $Z0 starts automatically during system load. To configure the
compatibility distributor, include BUILD_Z0_PROCESS in the ALLPROCESSORS
section of your SYSGEN specification. (For details, see the System Generation
Manual.) The INSTALL program includes the compatibility-distributor object file,
$ISV.ZEMS.OCDIST, in the SYSGEN auxiliary file, CONFAUX.
The compatibility distributor receives its configuration information from the primary
collector.
The compatibility distributor uses a selection criterion, which you can set to CRITICAL-
ONLY ON or CRITICAL-ONLY OFF. (For an explanation of these parameters, see
Compatibility Distributor ($Z0) on page 2-10.)
You can select the default value for CRITICAL-ONLY when the system is generated.
This default value is used each time the compatibility distributor is started. If you do not
specify a value for selection criterion, the system generation process sets it to
CRITICAL-ONLY ON.
G-Series RVU Considerations
To define the selection criterion during system generation, for systems running a G-
series RVU of the NonStop Kernel, use the EMSCCTRL commands.
D-Series RVU Considerations
To define the selection criterion during system generation in systems running a D-
series RVU of the NonStop Kernel, use the EMSCCTRL commands or set the value of
the EMSFLAGS parameter in the SYSTEM_PROCESS_MODIFIERS paragraph of the
configuration file. This optional paragraph can include the EMSFLAGS parameter and
XPOOLPAGES. (See The Primary Collector on page 12-21.)
SYSTEM_PROCESS_MODIFIERS:
$0 XPOOLPAGES n,
EMSFLAGS b;