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We have built a base of redundancy constructs centered around your data, its management, and the environment in which everything is housed. An end-toend availability design needs to consider the consumers of the services, as well as the network that delivers the well-behaved services from the data center to the client machines. In this chapter, we examine the issues surrounding client availability, ranging from having clients for users to various impacts of service failure on client applications. We re at Level 6 in the Availability Index, as shown in Figure 12.1. Clients sit squarely between the data center environment and the application layer, because they represent the user interface to any availability hardening. No clients, no availability. What should available services expect of their clients To paraphrase our founding father, Not much. There may be cases where a complex Web-based application needs to persist and restore in-flight state information, but we ll cover that as a server-side problem, not a client issue. This is purely about the client side of the problem that is, we re assuming the applications that are running on the clients aren t highly available themselves, but need to preserve the best possible user experience in the face of failures. In 13, we ll go up another level in the Index to explore application design consideration for making them more fault-resilient.

some other form of giveback There are so many factors that are out of the control of system vendors, and are therefore disallowed in the contracts, that those contracts seldom have any teeth, and even more seldom pay off Compare, for instance, the potential reliability of a server located in a northern California data center where, in early 2001, rolling power blackouts were a way of life, with a server in, say, Minnesota, where the traditionally high amounts of winter snow are expected and do not traditionally impact electric utility service Despite those geographical differences, system vendors offer the same uptime contractual guarantees in both places A system vendor cannot reasonably be expected to guarantee the performance of a local electric power utility, wide area network provider, or the data center cooling equipment Usually, those external factors are specifically excluded from any guarantees.

Agglutination occurs only over a certain range of serum dilutions because of either antigen or antibody excess. In the prozone, a large excess of antibody is present, so that each antibody behaves univalently and cross-linking does not occur (Eq. 5.5):

The other problem with the nines is that availability is a chain, and any failed link in the chain will cause the whole chain to fail Consider the diagram in Figure 21, which shows a simple representation of a user sitting at a client station and connected to a network over which he is working If the seven components in the figure (client station, network, file server and its storage, and the application server, its application, and its storage) have 9999 percent availability each, that does not translate to an end user seeing 9999 percent availability To keep the math simple, let s assume that all seven components have exactly the same level of expected availability, 9999 percent In reality, of course, different components have different levels of expected availability, and more complex components such as networks will often have lower levels.

The other assumption is that multiple failures do not occur at the same time (although they can, of course, in real life); that would needlessly complicate the math..

Services used Transport Transport Transformation Transport Transformation Technical Supervision Table 10.6. Notation on services 2 Note 1

5:5

2

At very high serum dilutions, a large excess of antigen exists, so that not enough antibody is present to cross-link the antigen and cause agglutination. In this case, the antigen behaves in a univalent manner (Eq. 5.6): 5:6 Only at the intermediate dilutions do the proportions of antibody and antigen allow signi cant, visible agglutination to occur. Blood typing is one common application of the agglutination test.10 Human erythrocytes may possess either or both of epitopes A and B on their surfaces. Individuals possessing only epitope A have Anti-B in their serum, while individuals possessing only epitope B on their erythrocytes have circulating Anti-A. Some individuals have neither epitope, and both antibodies present, while others have both epitopes, and neither antibody. Table 5.2 lists the four major blood groupings, and the epitopes and antibodies present in their serum. 5.5.2. Precipitation Reactions Precipitation reactions are similar in principle to agglutination reactions, the difference being that the antigen is a soluble, molecular species rather than a suspended particle such as a bacterium or erythrocyte. At a certain Ab/Ag ratio, the crosslinked polymeric network of antibody and antigen loses its solubility and precipitates. This is called the precipitin reaction.11 Figure 5.6 shows how the quantity of precipitin produced varies with the quantity of antigen added, for a xed total antibody concentration.

Availability of 99.99 percent over each of seven components yields a simple formula of 0.9999 to the seventh power, which works out to 99.93 percent. That may not sound like a huge difference, but the difference is actually quite significant:

Availability of 99.99 percent spread over a year is about 52 minutes downtime. Availability of 99.93 percent spread over a year is over 6 hours of downtime.