As per below documentation
I have created /opt/CA/VirtualAppliance/custom/dr_enabled file which has single "TRUE" (without double quotation) line in it, and reboot the vApp (Virtual Appliance). However IM, IP or IG are still started up after reboot. The dr_enabled file is not honored.
This is a known bug recorded in but ticket DE450560
Release : Virtual Appliance 14.3, 14.3 CP1, 14.3 CP2
Component : Identity Suite
Please raise a call ticket and request for available hot fix, i.e. HF-DE450560-0001.tar.gpg
The hot-fix can be applied on top of vApp 14.3, 14.3 CP1 or 14.3 CP2