3PAR System Reporter User’s Guide

System Reporter 2.8

Table 6-5.Performance Metrics for PD, Port, LD and VLUN Performance Reports

Metric

Description

 

 

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.

 

 

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.

6.12

Performance Reports