# tt_fan_speed_percent

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## Name

### Prometheus Metric Name

```
tt_fan_speed_percent
```

### Metric Path (tt-telemetry)

Schema:

```
{hostname}/tray{tray}/chip{chip}/fan{fan}/tt_fan_speed_percent
```

Example path:

```
bh-glx-c09u02/tray1/chip2/fan0/tt_fan_speed_percent
```

## Description

The fan speed as a percentage of maximum. This value is read from ARC firmware telemetry. A separate metric is created for each fan the device reports (`fan0`, `fan1`, ...), where the number is the fan's index in the ARC firmware's fan array. This metric is only created for fan slots that report speed data; devices that report no fans produce no metrics.

## Values

**Type:** Unsigned Integer

**Units:** Percent (%)

**Allowable values:**
A value from `0` to `100` representing the fan speed as a percentage of its maximum. For example, `75` means the fan is running at 75% speed.

## 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.|
|fan|The fan's index in the ARC firmware's fan array (`0`, `1`, ...).|
|unit|The unit of measurement. Always `"%"` for this metric.|