We've oracle 11.2.0.3 RAC on two nodes with aix 6.1 I was applying some patch on node 1 two weeks back and restarted grid. The following command failed rootcrs.pl -patch /u01/app/grid/perl/bin/perl /u01/app/grid/crs/install/rootcrs.pl -patch Using configuration parameter file: /u01/app/grid/crs/install/crsconfig_params CRS-4123: Oracle High Availability Services has been started. Failed to write the checkpoint:'' with status:FAIL.Error code is 256 Oracle Grid Infrastructure stack start initiated but failed to complete at /u01/app/grid/crs/install/crsconfig_lib.pm line 11627. When I opened a SR with oracle they told me that HAIP is running at node 1 while not running at node 2. As a workaround they suggested me to stop haip on node 1 as well. I did it and the was able to start ASM Last night I was applying JAN 2014 psu on same RAC nodes. I was able to apply it on node 1, restarted grid and everything. But when I applied it on node 2 it faile dto start with the same error as i got two weks back. And here i found out that HAIP was running at node 2. That stumped me as earlier i'd seen haip not running on node 2. I'd to turn it off again get going. Do you think a grid restart or patching would trigger HAIP while it was down couple of weeks back and nothing changed? What else could be the reason?