HP 3PAR System Reporter Software - Manual (Page 164)

6.12 Performance Reports
3PAR System Reporter User’s Guide System Reporter 2.8
For Histogram At Time and Histogram Versus Time report types, the PD, Port, LD and
VLUN Performance reports show the read counts, write counts or total counts in various service
time buckets. Depending on the Count control (see Count on page 5.32), these counts are
either the accesses within the sample interval or the total count from the beginning (object
creation or system reboot) until the current sample.
The CPU and VV Cache performance reports provide different metrics that are described
separately in the following sections.
Queue Length Queue length at the sample time.
Note that (unlike the other metrics above), the queue length is an
instantaneous measure at the sample time, not an average over the
sample interval.
Please note that due to the way that RCFC ports process data, the
Queue Length may not be a valid measure.
Avg Busy % The percentage of time that the object is busy (i.e., has at least one
outstanding IO operation).
Note that this is not the same thing as the percentage of available
object bandwidth that is being used. For example, a port shown as
50% busy may have much less than 50% of its bandwidth
utilized.This is because the port may be idle for a substantial period
of time between the request and response.
Please note that for RCFC ports, the value will always be at 100%
since the read requests are always waiting in the queue to be
processed.
Table 6-5. Performance Metrics for PD, Port, LD and VLUN Performance Reports
Metric Description