running on all CPS Virtual Machines (such as Policy Server (QNS), Policy
Director (LB), and sessionmgr) push data to the Collected master on the
pcrfclient01. The Collected master node in turn forwards the collected data to
the Graphite database on the pcrfclient01.
The Graphite database
stores system-related statistics such as CPU usage, memory usage, and Ethernet
interface statistics, as well as application message counters such as Gx, Gy,
pcrfclient02 collect and store these bulk statistics independently.
As a best practice,
always use the bulk statistics collected from pcrfclient01. Pcrfclient02 can be
used as a backup if pcrfclient01 fails.
In the event that
pcrfclient01 becomes unavailable, statistics will still be gathered on
pcrfclient02. Statistics data is not synchronized between pcrfclient01 and
pcrfclient02, so a gap would exist in the collected statistics while
pcrfclient01 is down.
It is normal to have
slight differences between the data on pcrfclient01 and pcrfclient02. For
example, pcrfclient01 will generate a file at time t and pcrfclient02 will
generate a file at time t +/- clock drift between the two machines.