The ologgerd is part of Oracle Cluster Health Monitor and is used by the Oracle Support to troubleshoot RAC problems. If ologgerd process is consuming a lot of CPU and writes a lot of data to disk, it can be stopped by executing on both nodes:
# crsctl stop resource ora.crf -init
to disable ologgerd permanently, execute:
# crsctl delete resource ora.crf -inithttp://www.rocworks.at/wordpress/?p=271
