X5650 的 IO 挺好的 
- root@linux:~# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
- 16384+0 records in
- 16384+0 records out
- 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.00933 s, 534 MB/s
- root@linux:~# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
- 16384+0 records in
- 16384+0 records out
- 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.00703 s, 535 MB/s
- root@linux:~# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
- 16384+0 records in
- 16384+0 records out
- 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 1.99188 s, 539 MB/s
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