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+> 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。