# tt_dram_total_megabytes

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## Name

### Prometheus Metric Name

```
tt_dram_total_megabytes
```

### Metric Path (tt-telemetry)

Schema:

```
{hostname}/dram/tt_dram_total_megabytes
```

Example path:

```
bh-glx-c09u02/dram/tt_dram_total_megabytes
```

## Description

Host-level sum of installed DRAM capacity across every MMIO-capable chip on this host, in mebibytes (1 MiB = 1024×1024 B), rounded to the nearest integer. The value is static for the lifetime of the process; it depends only on which chips are enumerated and their architecture/harvesting.

This metric is the denominator for host-level DRAM utilization (`tt_dram_used_megabytes / tt_dram_total_megabytes`).

## Values

**Type:** Unsigned Integer

**Units:** Megabytes (MB) — reported as mebibytes (1 MiB = 1024×1024 B), rounded to the nearest integer.

**Allowable values:**
A positive integer reflecting total DRAM capacity across all MMIO-capable chips on this host.

## 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).|
|unit|The unit of measurement. Always `"MB"` for this metric.|