# Log File Advanced Settings

The Log File advanced settings are available to operators to allow greater flexibility in handling the Catalyst’s Log File. You can control how much storage space (memory) is available for the Log File. You can also control what to do with the Log File data when the allocated space becomes filled.

Log File Size: This parameter determines how much NVRAM is reserved for the Log File. By default, the amount of storage space reserved is 256 Kbytes. This parameter can be set to zero if a Log File is not needed. Note: The memory configuration for Alarmware and the Catalyst must always be synchronized. Therefore this value cannot be altered while working offline.

"High-Water" mark: This parameter is a percentage of the Log File Size. As the storage space becomes filled with Log File data, the Catalyst will monitor how much memory is being used. When the set percentage threshold is reached, the Catalyst will attempt to off-load the data to destinations configured for Log File reports.

Never Initiate Off-Loading Session: When checked, this feature will tell the Catalyst to ignore the high-water percentage and never initiate an off-loading session with configured destinations based on storage capacity.

When storage is completely full: This option allows you to control how log file data is treated when all reserved space is in use. You can choose to either stop logging any data, or to over-write the oldest data. Before determining how to use this setting, you should consider what data would be the most important in keeping for future reference. If you stop logging, the old data is preserved and new data is lost. Otherwise, old data is lost and new data is captured.

Storage capacity can become filled when:

1. RTU is unable to deliver data to some destination configured for log file reports.
2. The log file reserve is too small for the configured data sampling and grouping.