> 本地作者；丁辉

# 测试磁盘是否为SSD

## 方法一

> 判断cat /sys/block/*/queue/rotational的返回值（其中*为你的硬盘设备名称，例如sda等等），如果返回1则表示磁盘可旋转，那么就是机械硬盘HDD了；反之，如果返回0，则表示磁盘不可以旋转，那么就有可能是固态硬盘SSD了。

```bash
grep ^ /sys/block/*/queue/rotational
```

## 方式二

1. 安装sysbench

   ```bash
   yum install -y sysbench
   ```

2. 选择要测的磁盘路径 /opt

   ```bash
   cd /opt
   ```

3. 建文件

   > 准备阶段：IO测试,线程数为40,创建大小为500M的测试文件64个,共32G,使用了随机读写模式(rndrw)测试300s，执行完后会在当前目录下生成一堆小文件。

   ```bash
   sysbench --test=fileio --file-total-size=32G --file-test-mode=rndrw --max-time=300 --max-requests=0 --file-block-size=16K --file-num=64 --num-threads=40 prepare
   ```

4. 测 IO

   ```bash
   sysbench --test=fileio --file-total-size=32G --file-test-mode=rndrw --max-time=300 --max-requests=0 --file-block-size=16K --file-num=64 --num-threads=40 run
   ```

5. 输出结果

   ```bash
   WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
   WARNING: --num-threads is deprecated, use --threads instead
   WARNING: --max-time is deprecated, use --time insteadsysbench 1.0.17 (using system LuaJIT 2.0.4)
   
   Running the test with following options:
   Number of threads: 40
   Initializing random number generator from current time
   
   Extra file open flags: (none)64 files, 512MiB each32GiB total file sizeBlock size 16KiBNumber of IO requests: 0Read/Write ratio for combined random IO test: 1.50Periodic FSYNC enabled, calling fsync() each 100 requests.Calling fsync() at the end of test, Enabled.Using synchronous I/O modeDoing random r/w testInitializing worker threads...
   
   Threads started!
   
   File operations:    
   reads/s:                    36369.44    
   writes/s:                   24246.29    
   fsyncs/s:                   38802.60
   
   Throughput:    
   read, MiB/s:                  568.27
   written, MiB/s:               378.85
   
   General statistics:    
   total time:                          300.0042s    
   total number of events:              29824059
   
   Latency (ms):         
   min:                               0.00         
   avg:                                    0.37         
   max:                                    8.21         
   95th percentile:                        1.96         
   sum:                             11174442.44
   
   Threads fairness:    
   events (avg/stddev):           745601.4750/1916.86    
   execution time (avg/stddev):   279.3611/0.06
   ```

6. 解读

   读写次数在2万~4万间，吞吐量在300~600M/s，可以判定磁盘为SSD。