auditd and redhat cluster

[Maupertuis Philippe]

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




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