At initial installation time, MFX will automatically access the key data set if you have chosen the KEYDSN option. If you subsequently make a change to the data set, MFX will not become aware of this change immediately. MFX's normal practice is to access the data set once an hour. If you want to have your change take effect immediately, execute MFX with the following JCL on whichever LPARs or machines are affected by the change.
Sample JCL to Update Key Data Set
//KEYUPDT EXEC PGM=SYNCSORT,PARM='KEYUPDATE'
//SYSOUT DD SYSOUT=*Whenever the KEYUPDATE parameter is used, WER907I messages will be generated that indicate whether or not key-related warning messages have been disabled.
If you disable the messages, it is recommended that you enable them again as soon as you update the data set with your new key. Failure to do this could result in a very short warning period the next time you change a machine or renew a contract.