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Planning for High Availability in the Enterprise
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in a year cannot exceed 52 minutes. Although this might seem like a long time, con sider that this is not for a single outage, but for an entire year. Reaching into the realm of five 9s of availability can be accomplished only by geo graphically dispersed systems that have automatic failover capabilities because achieving 99.999 percent availability means that a system can be unavailable for a maximum of only 5.26 minutes in an entire year. Although these levels of availability are accomplished on many systems in produc tion, guaranteeing high levels of availability requires very careful planning.
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To design a highly available environment, you need a roadmap. Figure 7-1 shows a basic roadmap for availability that can be found with the framework.
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High-Availability Framework Other relevant factors: Database Size Throughput Requirements Cost Requirements Solution Component Costs etc. Solutions to Specific Barriers Downtime Budget Business Availability Goals Barriers to Availability
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HA Solution Component (1)
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Figure 7-1
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High availability framework
Availability Requirements
Gathering availability requirements is the first step of planning any availability archi tecture. However, this is generally the most difficult element in the entire process. The difficulty is in trying to obtain realistic availability requirements. Every business per son will require 100 percent guaranteed availability, which is impossible to achieve.
Lesson 1: Assessing Database Availability Requirements
DBAs generally make the mistake of trying to determine availability requirements for a database. Business users understand the applications that they work with every day but not the databases that the applications connect to. Applications often use the data from multiple databases; if one database is unavailable, an entire application might be unavailable. You gather availability requirements based on an application, which enables you to draw a clear correlation between an application and a business process. With this basis, you can more easily determine the impact to the business for a particular appli cation and the data elements that it supports. Knowing the business impact enables you to determine realistic business requirements for availability.
Real World
Many years of designing high availability architectures has taught us that the most difficult part of the entire project is getting realistic availability require ments so solutions can be implemented. After a lot of trial and error, we finally found a reference that helps put things into perspective for the stakeholder responsible for a given application. E-mail systems used to be peripheral applications that didn t have much impact on a business. However, the instant an e-mail system is offline, the phone starts ringing before the monitoring system can even notify IT staff. E-mail has become a system that most businesses revolve around. You have to put the impact of an e-mail system being offline in perspective. It is serious and it does affect business operations. Will it cause the entire business to shut down Will a company go out of business if its e-mail server goes offline Certain processes will be a bit more difficult, and some delays will be intro duced. However, most businesses can still function. The question becomes this: Just how long can the e-mail system be offline before the business is irreparably damaged It is generally much longer than most users would expect because they rarely consider the time they don t use e-mail (such as when they are at lunch or the several hours each night they are asleep). This helps a stakeholder to begin to put an application into perspective.
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Planning for High Availability in the Enterprise
The interview process that you go through should result in the following pieces of information for each application:
Average number of users affected Type of user affected: internal or external How the application is used Which segment of the business is affected What percentage of overall business operations is affected Maximum amount of time the application can be offline before the business is irreparably damaged
The information gathered provides a basis for understanding the availability needed. You also gain knowledge about how an application is used. When you combine this knowledge with information about the data in the databases, you have the basis for making any decisions necessary during an outage.
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