While displaying System parameters from System statistics to look at the value for DEFAULT_INSERT_ALGORITHM, one member 1 (GCM1) of DS group has it, but the other member of DS group doesn't.
The number of lines displayed for R/SYSPARMS panel on member 1 is 427 while on member 2 it is 425.
The other thing noticed is that on Additional Systems Statistics Displays panel, the panel id on member 1 is R/ISYSTMC while on member 2, the panel id says R/MSYSTEMB. What would cause GCM1 and GCM2 displays to be different?
Release : 20.0
Component : CA Insight Database Performance Monitor for DB for z/OS
R/ISYSTMC and R/MSYSTEMB are part of MGSYSTEM where you can see the following:
#IF DB2VER > 11.1
#ELSEIF DB2VER > 10.1
So whether you get
R/ISYSTMC or R/MSYSTEMB depends on the release of DB2 you're running.
Updating DB2VER from 11.1 to 12.1 resolved the problem.