运行lnmp 磁盘速度下降很多是怎么回事？

netrefugee

执行lnmp stop后
/dev/mapper/cl_web2-root:
Timing buffered disk reads: 238 MB in  3.01 seconds =  79.19 MB/sec


执行lnmp start 后
/dev/mapper/cl_web2-root:
Timing buffered disk reads:   2 MB in  4.24 seconds = 482.52 kB/sec


是哪里有错误了