| Field | Internal name | Type | Warn | Crit | |
|---|---|---|---|---|---|
| Device utilization (percent) | util | gauge | None | None | Utilization of the device. If the time spent for I/O is close to 1000msec for a given second, the device is nearly 100% saturated. |
| Average device IO time (ms) | svctm | gauge | None | None | Average time an I/O takes on the block device |
| Average IO Wait time (ms) | avgwait | gauge | None | None | Average wait time for an I/O from request start to finish (includes queue times et al) |
| Average Read IO Wait time (ms) | avgrdwait | gauge | None | None | Average wait time for a read I/O from request start to finish (includes queue times et al) |
| Average Write IO Wait time (ms) | avgwrwait | gauge | None | None | Average wait time for a write I/O from request start to finish (includes queue times et al) |