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Splunk Enterprise and Splunk Light installation failure - Validating databases (splunkd validatedb) failed with code '1'

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Running either Splunk Enterprise or Light for the first time, I receive the error below. The command to start splunk is as follows:

/opt/splunk/bin/splunk start

Console output:

Splunk> All batbelt. No tights.

Checking prerequisites...
    Checking http port [8000]: open
    Checking mgmt port [8089]: open
    Checking appserver port [127.0.0.1:8065]: open
    Checking kvstore port [8191]: open
    Checking configuration...  Done.
        Creating: /opt/splunk/var/lib/splunk
        Creating: /opt/splunk/var/run/splunk
        Creating: /opt/splunk/var/run/splunk/appserver/i18n
        Creating: /opt/splunk/var/run/splunk/appserver/modules/static/css
        Creating: /opt/splunk/var/run/splunk/upload
        Creating: /opt/splunk/var/spool/splunk
        Creating: /opt/splunk/var/spool/dirmoncache
        Creating: /opt/splunk/var/lib/splunk/authDb
        Creating: /opt/splunk/var/lib/splunk/hashDb
New certs have been generated in '/opt/splunk/etc/auth'.
    Checking critical directories...    Done
    Checking indexes...
homePath='/opt/splunk/var/lib/splunk/audit/db' of index=_audit on unusable filesystem.
Validating databases (splunkd validatedb) failed with code '1'.  If you cannot resolve the issue(s) above after consulting documentation, please file a case online at http://www.splunk.com/page/submit_issue
root@splunk:~#
0 Karma
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Re: Splunk Enterprise and Splunk Light installation failure - Validating databases (splunkd validatedb) failed with code '1'

Champion

from a similar post - Careful. This is an indication that you may have Splunk deployed on top of an unsupported filesystem that does not implement required file locking mechanism. Setting that attribute in splunk-launch.conf is overriding our internal file locking test during startup.

$SPLUNK_HOME/etc/splunk-launch.conf:

OPTIMISTICABOUTFILE_LOCKING = 1

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