前面关于架构师如何思考(参见http://sbin.cn/blog/2008/06/16/perfect-architect/ 以及 http://sbin.cn/blog/2008/11/17/architecture-thinking/)进行了一些探讨,架构师应该充分理解业务背景和需求、综合运用IT的多领域技术,对企业IT的战略、发展路线、以及某些具体的实际的需求提出分析或解决方案。所以,架构师注定要是双语的 – 可以使用业务语言和管理层沟通,可以使用很技术的语言和技术专家和工程师们沟通。
在前文中还多次强调了架构师应该充分掌握并熟练运用分类学 – 从多维度、多角度来观察、思考,并深入浅出地阐述展现自己的分析和解决方案。在实际工作中,架构师经常需要面对具有很多不确定性的需求,在具有很多不确定性的环境下开发战略、路线图或解决方案,制定预算等。这时候,通常是两难的: 没有清晰的战略和路线图,制订了不了预算和项目计划;没有预算分析,管理层又很难批准什么战略或路线图。是Top-down呢,还是bottom-up呢? 要解决这种困境,需要架构师们主动地、灵活地出击,抓住问题的主要“矛盾”和关键环节,拿出“高”、“中”、“低”,“近”、“中”、“远”,等一些组合的分析,以便于管理层进行决策。
在诸多不确定性的环境下,要作出较为准确、切中要害的分析,架构师的个人经验和专业知识非常重要。除了分类学一个工具之外,还有一个小工具叫估算。 Read more…
Riverbed is a widely used appliance that can help accelerate the Wide Area Network (WAN) performance of mission critical applications. At the same time, it can help compress the traffic so that the cost savings of your expensive backbone network. However, before this release, it can not support Domino Notes, which means typically the biggest segment of the backbone traffic. This new release is a good news for the customers that have deployed Riverbed and with Domino applications at the same time.
San Francisco, CA, October 27, 2008 – Riverbed Technology (Nasdaq: RVBD), the technology and market leader in wide-area data services (WDS), today announced the upcoming release of enhanced versions of its Riverbed Optimization System (RiOS®), Steelhead Mobile and Riverbed Services Platform (RSP), which together will provide enterprises with the most comprehensive solution for application acceleration and cost savings across the data center, branch office, and mobile worker. With these releases, Riverbed enables enterprises to further consolidate IT infrastructure, enhance worker productivity and accelerate data protection, helping CIOs support a more efficient workforce and IT environment while reducing operational and financial investment.
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主流运营商的基础设施上已很少在ATM/FR继续投资,而是更多转向更新的IP/MPLS,表现在市场上,ATM/FR不再是运营商的主推产品,传统的点到点专线价格已呈上升趋势,而MPLS产品则逐渐取得价格优势,成为市场上广域网解决方案的主要选择。这一点在北美地区体现的尤其明显,欧洲运营商也有类似的特征。但是北美和欧洲并不代表世界,中国日本亚太印度中东很多地区传统的专线仍然具备价格优势,依然还是运营商的主要产品构成,而MPLS则处于市场推广阶段。Gartner的技术趋势分析认为大约在2010年,全球的运营商将普遍转向MPLS,帧中继将会彻底退出市场。在未来两三年里,主要的MPLS接入产品将包括专线、xDSL以及以太网。
另外还有一个显而易见的趋势就是Internet正在开始承载越来越多的企业应用,IP VPN被广泛用以企业内部、企业间数据交互以及其他关键度较低的数据业务,例如内容分发以及电子邮件、及时消息等,而将IP话音、ERP/CRM等依然运行在专线和MPLS上面。这时,专线和MPLS则和IP VPN一起构成了一个混合的企业广域网,通过相互间的业务分担和备份,企业可以大幅度降低广域网络的费用。
相对于帧中继和ATM,MPLS的主要优势体现在同一张IP网络上面提供不同应用和不同服务水平的能力, 能够为运营商提供更大程度的灵活性和产品多样性,从而降低运营成本、提高市场反应速度和竞争力。现在越来越多的企业已经或者正在准备将自己的骨干网迁移到MPLS上面来。此时,合理正确的收集用户业务的网络需求,对流量设计合理的优先级(CoS/CDR)以及QoS非常重要。
MPLS VPN services are one of the most important services of nowadays telecom broadband access and core networks. Generally speaking, it’s not difficult to provide a border to border service management for a MAN, or a core. but what the customers want to have is the end to end service management, that’s what they really experience.
The below diagram is from Concord, which was acquired by Computer Associates Int’l a few months ago. Their products, named eHealth and Spectrum, can help management heterogenous MPLS VPNs to provide a holistic view to the end user and the operators themselves.
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