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。

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

方式二

安装sysbench
```
yum install -y sysbench
```
选择要测的磁盘路径 /opt
```
cd /opt
```
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。
```
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
```

测 IO

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

输出结果

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

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。

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测试磁盘是否为SSD

方法一

方式二

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