Field values
This section describes the values stored in the fields.
For details about the source of data to be stored in the individual fields and the computation method (data sources), see K. Data Sources of Records.
- Organization of this page
Delta
In contrast to data collected as a cumulative value, a so-called delta value is data that indicates the amount by which the collection value has changed. For example, if the performance data value obtained during the first collection was 3 and the performance data value obtained during the second collection is 4, then the cumulative value is 7 but the change in the collected value is 1. In the tables, the Delta column indicates whether each field's value is a delta value. The performance data collected by PFM - RM for Platform varies as shown in the table below.
Note that the delta value can be a negative because it is a value relative to the previous data.
|
Record type |
Delta |
Performance data referencing method |
Indicate delta value# |
Performance data value |
|---|---|---|---|---|
|
PI record type |
Yes |
|
Selected |
The displayed value is the change amount. |
|
Not selected |
The displayed value is the change amount. |
|||
|
-- |
The displayed value is the change amount. |
||
|
No |
|
Selected |
The displayed value is the actual value at the time of data collection. |
|
|
Not selected |
The displayed value is the actual value at the time of data collection. |
|||
|
-- |
The displayed value is the actual value at the time of data collection. |
||
|
PD record type |
Yes |
|
Selected |
The displayed value is the change amount. |
|
Not selected |
The displayed value is the cumulative value. |
|||
|
-- |
The displayed value is the cumulative value. |
||
|
No |
|
Selected |
The displayed value is the actual value at the time of data collection. |
|
|
Not selected |
The displayed value is the actual value at the time of data collection. |
|||
|
-- |
The displayed value is the actual value at the time of data collection. |
- Legend:
-
--: Not applicable because the item is not displayed.
- #
-
Indicates whether one of the following items is selected in the check boxes for real-time report settings in PFM - Web Console:
-
Indicate delta value in the report wizard's Edit > Indication Settings(Realtime) window
-
Indicate delta value in Indication Settings(Realtime) on the Properties page in the Report window.
-
Notes about performance data collection
The following notes apply to collection of performance data:
-
For a record of the PI record type to be stored, performance data must be collected at least twice.
For the records of the PI record type, performance data is collected at the interval set by PFM - Web Console. However, no collected performance data is stored in the Store database at the time the performance data collection setting is executed in PFM - Web Console.
Because historical data for records of the PI record type contains data (delta value) that requires a difference from the previously collected data, data obtained by two collections is required. Therefore, a maximum of twice the set time is required before historical data can be stored in the Store database.
For example, if 300 seconds (5 minutes) is set as the performance data collection interval at 18:32 in PFM - Web Console, the first data collection will begin at 18:35. The next data collection will begin at 18:40. Historical data will be created from the data collected at 18:35 and 18:40; this historical data will be stored in the Store database at 18:40 (8 minutes after 18:32 when the settings were specified).
-
In real-time reports, values are displayed from the first time data is collected. If a report requires initial data, 0 will be displayed as the initial value. For the second and subsequent data collections, the operation depends on the report.
-
In the following cases, the value of the collected data is displayed after the second data collection:
-
Indicate delta value is not selected in the real-time report settings for records of the PI record type.
-
Indicate delta value is selected in the real-time report settings for records of the PD record type.
-
-
In the following case, the difference between the first and second data is displayed at the time of the second data collection, and the value of the collected data is displayed at the time of the third and subsequent collections:
-
Indicate delta value is selected in the real-time report settings for records of the PI record type.
-
-
If the monitoring target's channel is restarted when PFM - RM for Platform starts, the value of collected data might become negative. For the second and subsequent data that is collected, a positive value will be displayed as the difference between the data.
-
If the monitored host is running AIX 6.1 TL0 or TL1 in a Workload Partition (WPAR) environment, 0 is displayed for the following fields:
-
PI record
Interrupt Counts/sec
-
PI_CPU record
Interrupt Counts/sec
-