测试随机写IOPS：
fio -direct=1 -iodepth=128 -rw=randwrite -ioengine=libaio -bs=4k
-size=10G -numjobs=1 -runtime=1000 -group_reporting
-name=/path/testfile
测试随机读IOPS：
fio -direct=1 -iodepth=128 -rw=randread -ioengine=libaio -bs=4k
-size=10G -numjobs=1 -runtime=1000 -group_reporting
-name=/path/testfile
测试写吞吐量：
fio -direct=1 -iodepth=64 -rw=randwrite -ioengine=libaio -bs=64k
-size=10G -numjobs=1 -runtime=1000 -group_reporting
-name=/path/testfile
测试读吞吐量：
fio -direct=1 -iodepth=64 -rw=randread -ioengine=libaio -bs=64k
-size=10G -numjobs=1 -runtime=1000 -group_reporting
-name=/path/testfile
案例：
写：time dd if=/dev/zero of=/mnt/mfs/test2/test500M bs=1024k count=500
读：time dd if=/mnt/mfs/test2/test500M of=/dev/null
| 1copy写 | 2copy写 | 1copy读 | 2copy读 | |
| 1M | 0m0.042s | 0m0.042s | 0m0.017s | 0m0.017s |
| 5M | 0m0.073s | 0m0.079s | 0m0.070s | 0m0.071s |
| 20M | 0m0.250s | 0m0.288s | 0m0.291s | 0m0.376s |
| 50M | 0m0.514s | 0m0.589s | 0m0.896s | 0m0.886s |
| 100M | 0m0.977s | 0m7.497s | 0m1.677s | 0m1.787s |
| 200M | 0m7.910s | 0m22.270s | 0m2.683s | 0m3.129s |
| 500M | 0m22.465s | 0m51.735s | 0m6.559s | 0m6.990s |
| 1G | 0m52.346s | 1m48.056s | 0m17.319s | 0m17.154s |
| 2G | 1m46.224s | 3m46.283s | 0m41.608s | 0m34.435s |
| 10G | 9m29.037s | 19m26.237s | 3m55.222s | 3m24.914s |
...