online的这台机器好像和esxi 有兼容性问题，不管了，先测试再说。
安装好ESXi，在使用vmware native driver 的情况下:
---------------------------------------------------------------------- CPU model : Intel(R) Xeon(R) CPU E3-1245 v5 @ 3.50GHz Number of cores : 4 CPU frequency : 3504.000 MHz Total size of Disk : 47.0 GB (1.2 GB Used) Total amount of Mem : 3902 MB (165 MB Used) Total amount of Swap : 3967 MB (0 MB Used) System uptime : 0 days, 0 hour 3 min Load average : 0.52, 0.20, 0.08 OS : CentOS 7.6.1810 Arch : x86_64 (64 Bit) Kernel : 3.10.0-957.el7.x86_64 ---------------------------------------------------------------------- I/O speed(1st run) : 499 MB/s I/O speed(2nd run) : 498 MB/s I/O speed(3rd run) : 497 MB/s Average I/O speed : 498.0 MB/s