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:

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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
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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