阿里云、腾讯云、Linode、AWS 的云服务器磁盘 I/O 对比

（测试机器配置都差不多） 阿里云 I/O speed(1st run) : 71.2 MB/s I/O speed(2nd run) : 71.0 MB/s I/O speed(3rd run) : 73.5 MB/s Average I/O: 71.9 MB/s

腾讯云 I/O speed(1st run) : 115 MB/s I/O speed(2nd run) : 127 MB/s I/O speed(3rd run) : 222 MB/s Average I/O: 154.667 MB/s

Linode I/O speed(1st run) : 832 MB/s I/O speed(2nd run) : 800 MB/s I/O speed(3rd run) : 774 MB/s Average I/O: 802 MB/s

AWS I/O speed(1st run) : 61.0 MB/s I/O speed(2nd run) : 61.8 MB/s I/O speed(3rd run) : 61.2 MB/s Average I/O: 61.3333 MB/s

差别为什么这么大？