Installed Oracle Linux 6.4 (64bit)
Installed grid infrastructure 12.1 (stand alone)
Installed Oracle DB 12.1 (stand alone)
Created ACFS volume and mounted it.
Up to here all is well.
Tried registering it for auto start but it failed:
# acfsutil registry -a /dev/asm/acfs_vol1-449 /opt/acfsdata/
Usage: srtl 
For detailed help on each command and object and its options use:
srvctl -help [-compatible] or
srvctl -help [-compatible]
PRKO-2012 : filesystem object is not supported in Restart
acfsutil registry: ACFS-03111: unable to add ACFS mount /opt/acfsdata within Oracle Registry
Starting with Oracle Database 12c, Oracle Restart configurations do not support the Oracle ACFS registry.
Need to start the ACFS filesystem manually as below example
#> /bin/mount -t acfs /dev/asm/acfs_vol1-449 /opt/acfsdata
5.2.3 Restrictions and Guidelines for Oracle ACFS
Oracle Restart does not support root-based Oracle Clusterware resources. For this reason, the following restrictions apply if you run Oracle ACFS on an Oracle Restart configuration:
Oracle Restart does not support Oracle ACFS resources on all platforms.
Starting with Oracle Database 12c, Oracle Restart configurations do not support the Oracle ACFS registry. >>>>>>>>>>
You must manually load Oracle ACFS drivers after a system restart. >>>>>>>>>>>>>>>
You must manually mount an Oracle ACFS file system, and unmount it after the Oracle ASM instance has finished running.
Creating Oracle datafiles on an Oracle ACFS file system is not supported in Oracle Restart configurations.
Reference link: http://docs.oracle.com/cd/E16655_01/install.121/e17720/oraclerestart.htm#LADBI7694