I faced the same issue after install. I have Mac High Sierra 10.13.3 and Installing Splunk 7.0.2.
I removed the splunk folder and re-installed. It worked as expected. (A popup appears asking what you would like to do. Click Start and Show Splunk. The login page for Splunk Enterprise opens in your browser window. - http://docs.splunk.com/Documentation/Splunk/7.0.2/SearchTutorial/InstallSplunk#Mac_OS_X_installation_instructions)
Then resolved homePath='/Applications/Splunk/var/lib/splunk/audit/db' of index=_audit on unusable filesystem. error with
https://answers.splunk.com/answers/306998/why-am-i-getting-homepathoptsplunkvarlibsplunkaudi.html with OPTIMISTIC_ABOUT_FILE_LOCKING = 1.
Thanks!
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