DM-Multipath setup for ORacle RAC Environment

For some reason as ORacle is running the multipath daemon seeem to be croaking on the i/o. I get path failures to 3 of the 4 paths and they bounce from failed running, active running. Once I stop RAC the failures dont happen anymore. THis is RHEL 6.8 unpatched (unable to get access to internet), I do have the path_grouping_policy set to multibus. when the policy is set to default I get no problems. All hardware is new, and dont see any failures of any sorts.