背景介绍：
目前项目在美国东西部以及欧洲都有服务器节点，跨互联网的数据传输速度很不稳定，之前我们主要是通过SCP以及Rsync等方式进行数据传输的。
无意间发现了BBCP这个软件之后，经过测试，效果非常好，速度提升效果很明显，并且传输速度一直比较稳定，同时支持日志以及失败后重试等参数，非常不错。
参考资料：
http://www.slac.stanford.edu/~abh/bbcp/
http://pcbunn.cithep.caltech.edu/bbcp/using_bbcp.htm
https://www.olcf.ornl.gov/kb_articles/transferring-data-with-bbcp/
安装配置：
[aikaiyuan@aikaiyuan~]$ sudo wget http://www.slac.stanford.edu/~abh/bbcp/bin/amd64_rhel60/bbcp -O /usr/bin/bbcp [aikaiyuan@aikaiyuan~]$ sudo chmod +x /usr/bin/bbcp [dong@west-ads1 ~]$ sudo wget http://www.slac.stanford.edu/~abh/bbcp/bin/amd64_rhel60/bbcp -O /usr/bin/bbcp [dong@west-ads1 ~]$ sudo chmod +x /usr/bin/bbcp [aikaiyuan@aikaiyuan~]$ which bbcp /usr/bin/bbcp [aikaiyuan@aikaiyuan~]$ ssh west-ads1 which bbcp /usr/bin/bbcp [aikaiyuan@aikaiyuan~]$ cd dong [aikaiyuan@aikaiyuandong]$ sudo dd if=/dev/zero of=/home/adsymp/dong/file.2g bs=1024M count=2
2+0 records in 2+0 records out 2147483648 bytes (2.1 GB) copied, 45.9129 s, 46.8 MB/s
[aikaiyuan@aikaiyuandong]$ ls -lh total 2.0G -rw-r--r-- 1 root root 2.0G Mar 4 06:40 file.2g [aikaiyuan@aikaiyuandong]$ time bbcp -r -P 2 -V -w 8m -s 16 file.2g west-ads1:/home/adsymp/dong/
bbcp: Window size reduced to 245760 bytes. bbcp: Indexing files to be copied... bbcp: Copying 0 files in 0 directories. Source sc2-admin1002.drawbrid.ge using initial send window of 18700 Target iad2-admin1002.drawbrid.ge using initial recv window of 87380 bbcp: Creating /home/adsymp/aikaiyuan/file.2g bbcp: 140304 06:46:12 0% done; 8.5 MB/s, avg 8.5 MB/s bbcp: 140304 06:46:14 1% done; 6.9 MB/s, avg 7.5 MB/s ... bbcp: 140304 06:51:46 99% done; 7.7 MB/s, avg 6.1 MB/s bbcp: 140304 06:51:48 99% done; 3.3 MB/s, avg 6.1 MB/s Source cpu=3.643 (sys=3.552 usr=0.091). File /home/adsymp/aikaiyuan/file.2g created; 2147483648 bytes at 6.0 MB/s 48 buffers used with 0 reorders; peaking at 0. Source sc2-admin1002.drawbrid.ge using a final send window of 433840 Target cpu=15.149 (sys=14.505 usr=0.644). Target iad2-admin1002.drawbrid.ge using a final recv window of 2298624 1 file copied at effectively 6.0 MB/s real 5m42.236s user 0m0.104s sys 0m3.567s
[aikaiyuan@aikaiyuandong]$ time scp file.2g west-ads1:/home/adsymp/dong/ file.2g 100% 2048MB 2.1MB/s 16:06 real 16m8.448s user 0m43.497s sys 0m7.548s
结论：
在上面的测试中，传输一个大小为2G的文件，使用BBCP耗时仅5分钟，而普通的SCP则耗时16分钟，速度提升超过60%。
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