The QueryPerf method can operate as a raw data feed that bypasses the vCenter database and instead retrieves performance data from an ESXi host. You can use a raw data feed to obtain real-time instance data associated with 20-second interval collection and aggregate data associated with the 5-minute intervals.
You can use a raw data feed on vCenter Server 2.5 and later.
| Performance Interval | Description |
|---|---|
| 20-second | ESXi servers collect data for each performance counter every 20 seconds and maintain that data for an hour. When you specify a 20-second interval in the query specification for the QueryPerf method (PerfQuerySpec.intervalId), the method operates as a raw data feed. The Server ignores the historical interval collection levels and retrieves data for all of the requested counters from the ESXi servers. When you send a query for 20-second instance data, the server returns the most recent data collected for the 20-second interval. The server does not perform additional, unscheduled data collection to satisfy the query. |
| 5-minute | ESXi servers aggregate performance data according to the system-defined performance interval which specifies data collection every 300 seconds. To use a raw data feed for this data, specify the following PerfQuerySpec properties in the call to the QueryPerf method.
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