The “Maximum size of the offline data file” setting defines the minimum percentage of disk space that should be available, if needed, for audit and monitoring service. It is intended to prevent audited computers from running out of disk space if the agent is sending data to its offline data storage location because no collectors are available.
For example, if you set the threshold to 10%, auditing will continue while spooling data to the offline file location as long as there is a least 10% of available disk space on the spool partition. When the available disk space reaches the threshold, auditing will stop until a collector is available.
The agent checks the spool disk space by periodically running a background process. By default, the background process runs every 15 seconds. Because of the delay between background checks, it is possible for the actual disk space available to fall below the threshold setting. If this were to occur, auditing would stop at the next interval. You can configure the interval for the background process to run by editing the HKLM\Software\Centrify\DirectAudit\Agent\DiskCheckInterval registry setting.