阿里云，香港，SSD云盘

[root@ali03 ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 29.2894 s, 83.9 MB/s

腾讯云，新加坡，默认

[root@VM_0_2_centos ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 3.70669 s, 663 MB/s

real    0m3.744s
user    0m0.040s
sys 0m2.450s

青云，北京3区，默认

[root@JY11 ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 17.3187 s, 142 MB/s

real    0m17.365s
user    0m0.033s
sys 0m1.644s