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| 复制代码root@us5a:~# dd bs=1M count=128 if=/dev/zero of=test conv=fdatasync
128+0 records in
128+0 records out
134217728 bytes (134 MB) copied, 0.487536 s, 275 MB/s
root@us5a:~# dd bs=1M count=128 if=/dev/zero of=test oflag=dsync
128+0 records in
128+0 records out
134217728 bytes (134 MB) copied, 0.535619 s, 251 MB/s
root@us5a:~# wget cachefly.cachefly.net/100mb.bin
--2013-02-15 23:43:35--  http://cachefly.cachefly.net/100mb.bin
Resolving cachefly.cachefly.net... 205.234.175.175
Connecting to cachefly.cachefly.net|205.234.175.175|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 104857600 (100M) [application/octet-stream]
Saving to: “100mb.bin”
100%[========================================================================================>] 104,857,600 20.3M/s   in 5.0s    
2013-02-15 23:43:40 (20.0 MB/s) - “100mb.bin” saved [104857600/104857600]
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