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HP OpenVMS Systemsask the wizard |
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The Question is: Is there a way of removing sysgen parameters that have already been applied before a reboot is performed? If so how? The Answer is : There is no way to remove a system parameter -- the OpenVMS Wizard will guess at the intended question. If you wish to reset the value, the recommended approach is via MODPARAMS.DAT and AUTOGEN or (less desirably) via SYSGEN or SYSMAN. If the particular system parameter is a dynamic parameter, you can use SYSGEN WRITE ACTIVE or the SYSMAN PARAMS WRITE ACTIVE command to change the running value. If you wish to reset the parameter value for the next reboot to a new value, use MODPARAMS and AUTOGEN or use the SYSGEN WRITE CURRENT or the SYSMAN PARAMS WRITE CURRENT command to store the value. If you wish make a change to one or more values transient and thus use the original value when the system next reboots, you can use the SYSBOOT (conversational bootstrap) and set the WRITESYSPARAMS value to 0 after all other SET commands and immediately before issuing the CONTINUE command to continue the bootstrap. If, on the other hand, you seek a way to roll back to older system parameter values after an AUTOGEN pass, then you may well have a copy of the old system parameters file in SYS$SYSTEM:. You can also load and store the current parameters using the USE and WRITE commands in the SYSGEN utility or in the SYSMAN PARAMS mechanism. If you wish to use the conversational bootstrap mechanism (SYSBOOT) to make temporary changes to system parameters, you can use the SET command on the parameter(s) as required, and then issue the SYSBOOT command SET WRITESYSPARAMS 0 just before the CONTINUE command to continue the system bootstrap. This sequence will load the new parameter value(s) into the active parameters, but will not update the saved parameter value(s). You can then reboot the system to reset the parameter values back to the original configuration.
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