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As mentioned, capabilities are the nonfunctional, observable system qualities including scalability, manageability, performance, availability, reliability, and security, which are defined in terms of context. Measures of system quality typically focus on performance characteristics of the system under study. Some research has examined resource utilization and investment utilization, hardware utilization efficiency, reliability, response time, ease of terminal use, content of the database, aggregation of details, human factors, and system accuracy. Table 2-2 lists some well-known system quality measures.
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TABLE 2-1
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2: Common Architectures and Protocols
TABLE 2-2
Capabilities and System Quality
System Quality
Availability
Definition
The degree to which a system is accessible. The term 24 7 describes total availability. This aspect of a system is often coupled with performance. The ability to ensure the integrity and consistency of an application and its transactions. The ability to administer and thereby manage the system resources to ensure the availability and performance of a system with respect to the other capabilities. The ability to address architectural and hardware configuration changes without a great deal of impact to the underlying system. The ability to carry out functionality in a timeframe that meets specified goals. The ability of a system to run multiple tasks per unit of time. The ability to support the required availability and performance as transactional load increases. The ability to extend functionality. The ability to predict and confirm results based on a specified input or user gesture. The ability to use a component in more than one context without changing its internals. The ability to ensure that information is not accessed and modified unless done so in accordance with the enterprise policy.
Reliability Manageability
Flexibility Performance Capacity Scalability Extensibility Validity Reusability Security
Availability
The availability of a system is often coupled with performance. Availability is the degree to which a system, subsystem, or equipment is operable and in a committable state at the start of a session, when the session is called for at an unknown, or random, time. The conditions determining operability must be specified. Expressed mathematically, availability is 1 minus the unavailability. Availability is the ratio of (a) the total time a functional unit is capable of being used during a given interval to (b) the length of the interval. An example of availability is 100/168, if the unit is capable of being used for 100 hours in a week. Typical availability objectives are specified in decimal fractions, such as 0.9998.
Principles of Architecture
Reliability
Reliability is the ability of an item to perform a required function under stated conditions for a specified period of time. Reliability is the probability that a functional unit will perform its required function for a specified interval under stated conditions. The proper functioning of a company s computer systems is now critical to the operation of the company. An outage of an airline s computer systems, for example, can effectively shut down the airline. Many computer failures may be invisible to customers a temporary hiccup during the catalog order process, for example ( I can t check the availability of that item right now, but I ll take your order and call you back if there s a problem ), or cashiers having to use hand calculators to ring up sales. However, on the Internet, a company s computing infrastructure is on display in the store window in fact, the company s infrastructure is the store window, so a computer problem at Amazon.com would be tantamount to every Barnes and Noble branch in the world locking its doors. In the arena of Internet appliances and ubiquitous computing, the consumer cannot be placed in the position of troubleshooting the computer system. Reliability is critical because, eventually, people will expect their computers to work just as well as any other appliance in their home. After all, who has heard of a TV program that is incompatible with the release level of your television What does reliability mean from the standpoint of computer architecture It is instructive to examine a system that is designed to have high fault tolerance and to allow repair without shutting down the system. For example, the IBM G5 series of S/390 mainframes have shown mean time to failure of 45 years, with 84 percent of all repairs performed while the system continues to run. To achieve this level of fault tolerance, the G5 includes duplicate instruction decode and execution pipeline stages. If an error is seen, the system retries the failing instruction. Repeated failures result in the last good state of the CPU being moved to another CPU, the failed CPU being stopped, and a spare CPU being activated (if one is available). At the other end of the design spectrum, most PC systems do not have parity checking of their memory, even though many of these systems can now hold gigabytes of memory. Clearly, there is much room for computer architects to move high-end reliability and serviceability down into low-end servers, personal computers, and ubiquitous computing devices.
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