The value of tmnxMobGtpPriGrpCf2Limit specifies the limit
(in megabytes) for an amount of memory on the second compact flash that
can be used for the Charging Data Records (CDR) storage. Once the
threshold has been reached, the system can no longer support accurate
charging.
If the compact flash is not available then tmnxMobGtpPriGrpCf2Limit
will be set to 0.
If tmnxMobGtpPriGrpCf2State is enabled and the value of
tmnxMobGtpPriGrpCf2Limit is 0, then maximum available memory on the
second compact flash can be used for the CDR storage.