今天参加了Riverbed公司(纳斯达克代码:RVBD)的广域网加速设备---Steelhead的技术交流会。

  简单说,Riverbed公司的Steelhead设备可以在不增加带宽的情况下,解决带宽、应用、存储等一系列问题。Steelhead系列设备能将现有的分布式IT系统的吞吐能力提高达100倍之多,这就意味着企业甚至能在广域网上实现类似于局域网的应用性能。

  据Riverbed的工程师介绍,Riverbed的核心技术是“可伸缩的数据索引”,数据优化通过使用一种专属算法,将数据分割成多个可参照的小数据块,即数据碎片化。进行动态切割。一个碎片一个标记,并存储在Steelhead设备。文件第一次通过网络传送时,其所有数据和索引链发出请求,在硬盘中储存。把碎片加指针进行传输,巧妙的办法就是将指针作为原始数据,再进行碎片化。当传输文件时,不是对文件进行操作,而是对历史的所有碎片进行操作,系统对碎片不断进行记忆,后面可以引用前面的碎片。这样,有些看来是第一次传输的文件其实并非第一次传输,所以传输速度快很多。

  举个例子,一个10M大小的电子邮件附件,同时要抄送给外地某分部门的3个人,就算能够将其压缩到1M,也需要在广域网上传输总共3M的数据。而使用Riverbed公司的Steelhead设备后,只需在广域网上传输1M数据。

  点击在新窗口中浏览此图片

  TCP包中有很多限制。如传输数据从广州到北京。Steelhead是将TCP进行中断,从广州到本地Steelhead是一段,从Steelhead到另一个Steelhead是一段,从Steelhead到北京又是一段,共三段连接。当TCP的包从广东传出来后,到Steelhead为止,设备把这些包打开,将数据拿出来,切成碎片,这些碎片有一部分是以前已经存在的历史碎片的记录,将碎片配以指针,再进行TCP打包。这就可将10,000个包变成100个包,大大缩短了延迟。基于Riverbed的这“三段论”,北京的Steelhead就像广州在北京的代表处,很多问题变年成了局域网的问题,减少了网络容量。

  新浪的邮件部门将率先采用Steelhead设备。

  附:Riverbed公司成立于2002年,位于美国加利福尼亚州的旧金山市,纳斯达克上市公司,其中文网址为:http://www.riverbed.com/cn/




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