# tt_fan_speed_rpm

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## Name

### Prometheus Metric Name

```
tt_fan_speed_rpm
```

### Metric Path (tt-telemetry)

Schema:

```
{hostname}/tray{tray}/chip{chip}/tt_fan_speed_rpm
```

Example path:

```
bh-glx-c09u02/tray1/chip2/tt_fan_speed_rpm
```

## Description

The fan speed in revolutions per minute (RPM). This value is read from ARC firmware telemetry. This metric is only created if the device reports fan RPM data.

## Values

**Type:** Unsigned Integer

**Units:** Revolutions per minute (RPM)

**Allowable values:**
A non-negative integer representing the fan speed in RPM. For example, `3000` means the fan is spinning at 3000 revolutions per minute.

## Prometheus Labels

|Label Name|Value|
|---|---|
|hostname|The host from which the metric was collected.|
|hall|The datacenter hall where the host is located. Sourced from the Factory System Descriptor (FSD).|
|aisle|The datacenter aisle where the host is located. Sourced from the Factory System Descriptor (FSD).|
|rack|The rack number where the host is located. Sourced from the Factory System Descriptor (FSD).|
|shelf_u|The shelf U position in the rack where the host is located. Sourced from the Factory System Descriptor (FSD).|
|tray|The tray (UBB) that the device is located on.|
|chip|The ASIC location within the tray.|
|unit|The unit of measurement. Always `"RPM"` for this metric.|