华为云新加坡Flexus L:

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root@host-192-168-7-62:~# dd if=/dev/zero of=test bs=64k count=4k oflag=dsync
4096+0 records in
4096+0 records out
268435456 bytes (268 MB, 256 MiB) copied, 8.37634 s, 32.0 MB/s

作为对比,下面是阿里云香港和rn美西的测试结果:
阿里云:

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root@ubuntu:~# dd if=/dev/zero of=test bs=64k count=4k oflag=dsync
4096+0 records in
4096+0 records out
268435456 bytes (268 MB, 256 MiB) copied, 6.12062 s, 43.9 MB/s

rn:

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root@racknerd-server:~# dd if=/dev/zero of=test bs=64k count=4k oflag=dsync
4096+0 records in
4096+0 records out
268435456 bytes (268 MB, 256 MiB) copied, 1.92984 s, 139 MB/s