Cisco Cisco ASR 5000
Backup and Recovery of Key KPI Statistics
▀ Feature Description
▄ SGSN Administration Guide, StarOS Release 18
Feature Description
Before the Backup and Recovery of Key KPI Statistics feature was implemented, statistics were not backed up and
could not be recovered after a SessMgr task restart. Due to this limitation, monitoring the KPI was a problem as the
SGSN would loose statistical information whenever task restarts occurred.
could not be recovered after a SessMgr task restart. Due to this limitation, monitoring the KPI was a problem as the
SGSN would loose statistical information whenever task restarts occurred.
KPI calculation involves taking a delta between counter values from two time intervals and then determines the
percentage of successful processing of a particular procedure in that time interval. When a SessMgr crashes and then
recovers, the SGSN loses the counter values - they are reset to zero. So, the KPI calculation in the next interval will
result in negative values for that interval. This results in a dip in the graphs plotted using the KPI values, making it
difficult for operations team to get a consistent view of the network performance to determine if there is a genuine issue
or not.
percentage of successful processing of a particular procedure in that time interval. When a SessMgr crashes and then
recovers, the SGSN loses the counter values - they are reset to zero. So, the KPI calculation in the next interval will
result in negative values for that interval. This results in a dip in the graphs plotted using the KPI values, making it
difficult for operations team to get a consistent view of the network performance to determine if there is a genuine issue
or not.
This feature makes it possible to perform reliable KPI calculations even if a SessMgr crash occurs.