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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
Table
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