This topic describes the runtime behavior.
FDR configuration is accessible only through the embedded Web pages.
Understanding Volatile and Non-volatile Configurations
The Momentum 170ENT11001 supports a temporary, RAM only, version of the configuration in addition to the non-volatile FLASH/FDR version. Therefore, a temporary configuration may be different than the configuration stored in FLASH or on the FDR server.
This volatile version of the configuration would not exist after a loss of power.
Volatile configuration changes may be accomplished either by a:
On the web page, the user will have the option to apply the displayed configuration parameters to the current configuration (i.e., create a RAM only version) or save them to non-volatile storage and apply them to the current configuration.
Non-volatile configuration parameter changes are handled differently at run-time than configuration changes at start-up.
Configuration Database Consistency Check
While running, approximately every five minutes the Momentum 170ENT11001 will read its configuration file from the FDR server and compare the configuration from the server against the configuration in FLASH, a consistency check.
In addition to ensuring consistency in the databases, this consistency check also protects against the configurations on the FDR server being lost because of a replacement of the FDR server.
While performing this consistency check, the Momentum 170ENT11001 performs the following:
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If the two configuration files are identical, no action is taken.
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If the two configuration files are different and valid, the adapter takes the configuration parameters from the FDR server and stores those parameters to FLASH and applies the current parameters.
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If the FDR server has an empty file, the device pushes its stored configuration up to the FDR server. This action safeguards against the FDR server being replaced.
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If the adapter cannot communicate with the FDR server, the adapter blinks the FDR update failure code on the LAN status LED and every 30 seconds indefinitely retries to communicate successfully with the FDR server. When the problem is fixed, the Momentum 170ENT11001 clears the error and returns to a normal running state.
NOTE: If the IP address of the FDR server is changed, the Momentum ENT11001 is unable to find the server and reports an FDR update failure code on the LAN status LED.
Reboot the Momentum ENT11001.
About Outstanding Updates
When a Momentum 170ENT11001 is participating in FDR, all configuration changes that are stored are saved to FLASH and applied to current parameters as well as pushed to the FDR server. In the event that this push could not succeed, for example a network failure, the Momentum 170ENT11001 will have an outstanding update and will blink the FDR update failure code.
Upon succeeding to communicate with a FDR server, the Momentum 170ENT11001 will clear the blink code and resumes normal operation.
If a power failure occurs while an outstanding update exists, the Momentum 170ENT11001 stores the outstanding update in FLASH. When powered up, the adapter will attempt to complete an outstanding update. the Momentum 170ENT11001 will push the parameters stored in the FLASH database up to the FDR server and will run with these values.
