# blade create disk fill

磁盘填充混沌实验

## 介绍

模拟磁盘填充，可以指定填充的目录和填充大小。

验证磁盘满下对系统服务的影响，比如监控告警、服务稳定性等。

## 参数

```
--path string      需要填充的目录，默认值是 /
--size string      需要填充的文件大小，单位是 M，取值是整数，例如 --size 1024
--reserve string   保留磁盘大小，单位是MB。取值是不包含单位的正整数，例如 --reserve 1024。如果 size、percent、reserve 参数都存在，优先级是 percent > reserve > size
--percent string   指定磁盘使用率，取值是不带%号的正整数，例如 --percent 80
--retain-handle    是否保留填充
--timeout string   设定运行时长，单位是秒，通用参数
```

## 案例

```
# 执行实验之前，先看下 /home 所在磁盘的大小
df -h /home

Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G  4.0G   34G  11% /

# 执行磁盘填充，填充 40G，即达到磁盘满的效果（可用34G）
blade create disk fill --path /home --size 40000

# 返回结果
{"code":200,"success":true,"result":"7a3d53b0e91680d9"}

# 查看磁盘大小
df -h /home

Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G   40G     0 100% /

# 销毁实验
blade destroy 7a3d53b0e91680d9

{"code":200,"success":true,"result":"command: disk fill --debug false --help false --path /home --size 40000"}

# 查看磁盘大小
df -h /home

Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G  4.0G   34G  11% /

# 执行按百分比填充磁盘，并且保留填充磁盘的文件句柄
blade c disk fill --path /home --percent 80 --retain-handle

{"code":200,"success":true,"result":"f1fa65e70950d0eb"}

df -h
/dev/vda1        40G   30G  8.1G  79% /

# 查看文件句柄
lsof /home/chaos_filldisk.log.dat
COMMAND     PID USER   FD   TYPE DEVICE    SIZE/OFF   NODE NAME
chaos_fil 19297 root    3r   REG  253,1 17697865728 394174 /home/chaos_filldisk.log.dat

# 执行保留固定大小实验场景
blade c disk fill --path /home --reserve 1024

df -h
Filesystem      Size  Used Avail Use% Mounted on

/dev/vda1        40G   37G  1.1G  98% /
```

## 实验原理

使用 fallocate、dd 命令实现

## 场景问题


---

# Agent Instructions: 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:

```
GET https://chaosblade-io.gitbook.io/chaosblade-help-zh-cn/blade-create-disk-fill.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.