Thanks for your response. I agree with all your suggestions.
At this moment, I'm concerned about the WAL archiving.
I'm seeing below error on pg3 (DR server) in log. Is this expected ?
cp: cannot stat '/mnt/server/archivedir/00000001000000000000000D': No such file or directory
Yes, this is expected. That file has not been archived yet because the master is not done writing data to it yet. pg3 will keep retrying the command until the file shows up.
