While opatchauto handles stack management, manually stopping the database instances prevents hung processes during a non-rolling sequence. Run this as the root user from one node:
Although opatchauto can attempt to shutdown databases automatically in non‑rolling mode, it is safer to do it manually: opatchauto72030 execute in nonrolling mode
Download the latest OPatch utility version matching your database release from My Oracle Support (MOS). While opatchauto handles stack management