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Use non_negative_derivative in diskio example queries (#4370)

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Canux 2018-07-04 02:03:17 +08:00 committed by Daniel Nelson
parent c5fa6729d3
commit cba87212d3
1 changed files with 2 additions and 2 deletions
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4
plugins/inputs/system/DISKIO_README.md
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@ -107,13 +107,13 @@ requests that are in the queue but not yet issued to the device driver.
#### Calculate percent IO utilization per disk and host:
```
SELECT derivative(last("io_time"),1ms) FROM "diskio" WHERE time > now() - 30m GROUP BY "host","name",time(60s)
SELECT non_negative_derivative(last("io_time"),1ms) FROM "diskio" WHERE time > now() - 30m GROUP BY "host","name",time(60s)
```
#### Calculate average queue depth:
`iops_in_progress` will give you an instantaneous value. This will give you the average between polling intervals.
```
SELECT derivative(last("weighted_io_time",1ms)) from "diskio" WHERE time > now() - 30m GROUP BY "host","name",time(60s)
SELECT non_negative_derivative(last("weighted_io_time",1ms)) from "diskio" WHERE time > now() - 30m GROUP BY "host","name",time(60s)
```
### Example Output: