root@vmadmin:~# dd if=/dev/zero of=test bs=64k count=4k oflag=dsync;rm test
4096+0 records in
4096+0 records out
268435456 bytes (268 MB) copied, 158.315 s, 1.7 MB/s
dd if=/dev/zero of=test bs=64k count=4k oflag=dsync;rm test
4096+0 records in
4096+0 records out
268435456 bytes (268 MB) copied, 13.8574 seconds, 19.4 MB/s
运气好,我的BV还不错
[root@OVZ ~]# dd if=/dev/zero of=test bs=64k count=4k oflag=dsync;rm test
4096+0 records in
4096+0 records out
268435456 bytes (268 MB) copied, 4.19745 seconds, 64.0 MB/s