The value of tmnxMobGtpPriGrpCf1Limit specifies the limit
(in megabytes) for an amount of memory on the first 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 tmnxMobGtpPriGrpCf1Limit
will be set to 0.
If tmnxMobGtpPriGrpCf1State is enabled and the value of
tmnxMobGtpPriGrpCf1Limit is 0, then maximum available memory on the
second compact flash can be used for the CDR storage.