Increasing DB2 Messages Display from option 4 of Main Menu

Document ID : KB000117055
Last Modified Date : 09/10/2018
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Issue:
When entering  SYSVIEW DB2 option 4-Messages, only 30 minutes worth of data is available Is there a way to increase this retention? 
Resolution:
The number of ILOGS PAGES controls the size of virtual file used to store the DB2 messages, commands, and logged exceptions. 
For every 180 pages specified here, 1 CYL of 3390 DASD should be allocated for the ILOG VSAM datasets in source member GSSILOG. 
So basically the ILOG datasets need to be redefined  to hold more pages. 
Default is 200. 
See (Optional) Enable Message Logging and Configure GSS section of R20 of Sysview for DB2 Guide additional info.