3PAR System Reporter User’s Guide

System Reporter 2.8

10.4.9 Common Performance Table Columns

The statport, statvlun, statld and statpd tables all have a common set of columns for the performance data. These columns are described in Table 10-19.

Table 10-19.Common Performance Columns

Column

Type

Comment

 

 

 

begin

DOUBLE PRECISION NOT

Timestamp value indicating when the

 

NULL

counting started (typically when the system

 

 

was rebooted or the device was created).

 

 

Two count samples should only be

 

 

compared if the begin value is the same for

 

 

the two samples. For example, the

 

 

difference between rcount values of two

 

 

samples represents the number of read

 

 

operations in the interval between those

 

 

samples only if the begin values are the

 

 

same for those samples.

 

 

 

d_begin

DOUBLE PRECISION NOT

Difference between begin value from last

 

NULL

sample for the same object.

 

 

 

now

DOUBLE PRECISION NOT

Timestamp value in microseconds. The

 

NULL

difference in the now values of two

 

 

samples should be used in calculating the

 

 

time interval between two samples

 

 

 

d_now

DOUBLE PRECISION NOT

Difference between now value from last

 

NULL

sample for the same object.

 

 

 

qlen

DOUBLE PRECISION NOT

Queue length at the time of the sample.

 

NULL

qlen is an instantaneous measure, not an

 

 

average queue length over the sample

 

 

period.

 

 

qlen may not be available for all objects

 

 

and its value will be negative to indicate

 

 

that it is invalid.

 

 

 

10.30 The Sample Data and Inventory Tables