> For the complete documentation index, see [llms.txt](https://docs.fluentbit.io/manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fluentbit.io/manual/1.2/input/disk.md).

# Disk Usage

The **disk** input plugin, gathers the information about the disk throughput of the running system every certain interval of time and reports them.

## Configuration Parameters

The plugin supports the following configuration parameters:

| Key            | Description                                                                                                               |
| -------------- | ------------------------------------------------------------------------------------------------------------------------- |
| Interval\_Sec  | Polling interval (seconds).  default: 1                                                                                   |
| Interval\_NSec | Polling interval (nanosecond). default: 0                                                                                 |
| Dev\_Name      | Device name to limit the target. (e.g. sda). If not set, *in\_disk* gathers information from all of disks and partitions. |

## Getting Started

In order to get disk usage from your system, you can run the plugin from the command line or through the configuration file:

### Command Line

```bash
$ fluent-bit -i disk -o stdout
Fluent-Bit v0.11.0
Copyright (C) Treasure Data

[2017/01/28 16:58:16] [ info] [engine] started
[0] disk.0: [1485590297, {"read_size"=>0, "write_size"=>0}]
[1] disk.0: [1485590298, {"read_size"=>0, "write_size"=>0}]
[2] disk.0: [1485590299, {"read_size"=>0, "write_size"=>0}]
[3] disk.0: [1485590300, {"read_size"=>0, "write_size"=>11997184}]
```

### Configuration File

In your main configuration file append the following *Input* & *Output* sections:

```python
[INPUT]
    Name          disk
    Tag           disk
    Interval_Sec  1
    Interval_NSec 0
[OUTPUT]
    Name   stdout
    Match  *
```

Note: Total interval (sec) = Interval\_Sec + (Interval\_Nsec / 1000000000).

e.g. 1.5s = 1s + 500000000ns


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.fluentbit.io/manual/1.2/input/disk.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.