auditd and redhat cluster

Hi list, One clusters fenced the passive node around two hours after auditd was started. We have found that iowait has increased since auditd was started and was unusually high. Auditd wasn't generating many messages and there were no noticeable added activity on the disk were the audit and syslog files were written. Besides watches, the only general rules were : # creation -a exit,always -F arch=b32 -S creat -S mkdir -S mknod -S link -S symlink -S mkdirat -S mknodat -S linkat -S symlinkat -F uid=root -F success=1 -k creation -a exit,always -F arch=b64 -S creat -S mkdir -S mknod -S link -S symlink -S mkdirat -S mknodat -S linkat -S symlinkat -F uid=root -F success=1 -k creation # deletion -a exit,always -F arch=b32 -S rmdir -S unlink -S unlinkat -F uid=root -F success=1 -k deletion -a exit,always -F arch=b64 -S rmdir -S unlink -S unlinkat -F uid=root -F success=1 -k deletion After the rebot we deleted all rules and didn't notice extra iowait anymore. Could these rules be the cause of additional iowait even if not generating many events (around 20 in two hours) ? Is there any other auditd mechanism that could explain this phenomenon ? I would appreciate any hints. Regards Philippe !!!************************************************************************************* "Ce message et les pi?ces jointes sont confidentiels et r?serv?s ? l'usage exclusif de ses destinataires. Il peut ?galement ?tre prot?g? par le secret professionnel. Si vous recevez ce message par erreur, merci d'en avertir imm?diatement l'exp?diteur et de le d?truire. L'int?grit? du message ne pouvant ?tre assur?e sur Internet, la responsabilit? de Worldline ne pourra ?tre recherch?e quant au contenu de ce message. Bien que les meilleurs efforts soient faits pour maintenir cette transmission exempte de tout virus, l'exp?diteur ne donne aucune garantie ? cet ?gard et sa responsabilit? ne saurait ?tre recherch?e pour tout dommage r?sultant d'un virus transmis. This e-mail and the documents attached are confidential and intended solely for the addressee; it may also be privileged. If you receive this e-mail in error, please notify the sender immediately and destroy it. As its integrity cannot be secured on the Internet, the Worldline liability cannot be triggered for the message content. Although the sender endeavours to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted.!!!"