Isilon Troubleshooting question

Hello,

I need help with troubleshooting logs on Isilon cluster. We have a quota where soft limit is set a while back (probably an year or less than that) . We are in process of checking the logs to see the user created the particular quota. How long Isilon keeps the logs information?

Can we able to see the user details who created the NFS shares or quotas ? If yes, Could you please direct to the log file location ?