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Figure 14-6: A simple packet-switched network One major advantage of packet switching (with segmented messages) is that it achieves end-to-end delays that are typically much smaller than the delays associated with message-switching We illustrate this point with the following simple example Consider a message that is 75 Mbits long Suppose that between source and destination there are two packet switches and three links, and that each link has a transmission rate of 15Mbps Assuming there is no congestion in the network, how much time is required to move the message from source to destination with message switching It takes the source 5 seconds to move the message from the source to the first switch Because the switches use store-andforward, the first switch cannot begin to transmit any bits in the message onto the link until this first switch has received the entire message Once the first switch has received the entire message, it takes 5 seconds to move the message from the first switch to the second switch Thus it takes ten seconds to move the message from the source to the second switch Following this logic we see that a total of 15 seconds is needed to move the message from source to destination These delays are illustrated in Figure 14-7

In an era where computer hardware prices shrink logarithmically, it s hard to explain to management that you can t get fault-tolerant system operation at desktop PC prices Our goal is to help define the metrics, the rules, and the guidelines for making and justifying these cost/benefit tradeoffs Availability is commonly measured in nines 9999 percent uptime is four nines Our goal is to help you increase the number of nines you can achieve within your engineering constraints, and the number you can afford within your budget and cost constraints At the same time, we ll question the industry s dependence on nines as the only gauge of availability We ll frequently refer to cost/benefit or cost/complexity trade-offs.

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Books don't have a satisfying search capability built into them. The index is usually somewhat helpful and a "top-level" navigation system like the table of contents works to a point, but what about when you're looking for that one small section you read a few days ago The online book allows a reader to jump on the Net and run a quick search through the entire text. From a promotional standpoint, the online book makes deciding to purchase a text online as easy as reading a few passages of the same book from a physical store. Unlike reading selected passages that book mega-sites like Amazon may provide, having the entire text of your book online lets consumers see for themselves without leaving their home if it really fills their needs before ordering the paper version online. And the importance of a book existing in a hypertexted Web space can't be stressed enough. The very foundation of the WWW is the ability to use hypertext to a degree previously only dreamed of. The phrase "see also: section x in chapter y" works as a link directly to the cross-reference. A categorized list of links (like those in the appendices of this book) is much more accessible and usable, especially when accompanied by a searchable index. And details of a footnote or citation

Figure 14-7: Timing of message transfer of a 75 Mbit message in a message-switched network Continuing with the same example, now suppose that the source breaks the message into 5000 packets, with each packet being 15 Kbits long Again assuming that there is no congestion in the network, how long does it take to move the 5000 packets from source to destination It takes the source 1 msec to move the first packet from the source to the first switch And it takes the first switch 1 msec to move this first packet from the first to the second switch But while the first packet is being moved from the first switch to the second switch, the second packet is simultaneously moved from the source to the first switch Thus the second packet reaches the first switch at time = 2 msec Following this logic we see that the last packet is completely received at the first switch at time = 5000 msec = 5 seconds Since this last packet has to be transmitted on two more links, the last packet is received by the destination at 5002 seconds:

Such decisions abound in technology-driven companies: Buy or build Faster time to market or more features Quick and dirty or morally correct but slower Our job is to provide some guidelines for making these decisions We ll try to avoid taking editorial stances, because there are very few absolutes in engineering design..

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