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Verify the existence of the ohasd pointer, as follows, in the OS-specific file: /etc/init, /etc/inittab

From

Cover of Expert Oracle RAC 12c

Note

Note: Oracle Linux 6 (OL6) or Red Hat Linux 6 (RHEL6) has deprecated inittab, rather, init.ohasd will be configured via upstart in /etc/init/oracle-ohasd.conf, however, the process ""/etc/init.d/init.ohasd run" should still be up.

for example on one of our test boxes:
[root@fwlxrac1 ~]# more /etc/init/oracle-ohasd.conf

Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle OHASD startup

start on runlevel [35]
stop on runlevel [!35]
respawn
exec /etc/init.d/init.ohasd run >/dev/null 2>&1 </dev/null