We see many core dump file created suddenly and disk is getting full /opt/VRTSnbu/var/global/mqbroker/mqhomeNetbackup Master VCS cluster ,NBU vesion 18.104.22.168
Do a unix command "file" on the core dumps.
What process are creating the core dumps ?-
From the path, it looks like it related to Netbackup message broker service.
You can safely delete the core files.