z/OS operators use the HMC operating system messages panel as the console during an IPL.
The HMC only stores a limited number of messages to allow to scroll backwards in the console log.
Many products write hundreds of initialisation messages to the console (using WTO) during startup.
Adding MCSFLAG=HRDCPY to those WTOs, they will still be sent to the SYSLOG but they will no longer be sent to any consoles.
How to implement this suggestion?
SYSVIEW 17.0 - z/OS supported releases -
The writing of messages to the consoles via a WTO request can be easy controlled within SYSVIEW. SYSVIEW allows the user to control or specify the default route codes and descriptor codes used when issuing a WTO.
There is a "global" or default setting. Additionally, route codes and descriptor codes can also be specified by message id.
The global setting for route code and descriptor codes can be set in the SYSVIEW system configuration member. To view or alter this setting, Use the SYSVIEW "LIBS" command to display a list of SYSVIEW data sets.
You need to look at the member GSVXGSVX found in the system configuration library marked with the name: SCFGLIB
Within this member, look for statement like the ones below:
Route-Code 2
Route-Code 11
If there is a statement for Route-Code 2, delete or comment the entry.
When SYSVIEW is cycled, it will no longer send WTOs to the console.
The route codes can be individually specified by message id by updating the SYSVIEW MESSAGES parmlib member.
Using the system configuration options member is the recommended choice.