By Chris Oggerino
A realistic advisor to modeling and designing trustworthy networks presents a close creation to modeling availability worthwhile for community layout is helping community designers comprehend the theoretical availability in their topologies Explains the criteria that restrict availability to lessen the variety of community disasters offers all of the info essential to do uncomplicated availability modeling/budgeting excessive Availability community basics discusses the necessity for and the math of availability, then strikes directly to hide the problems affecting availability, together with undefined, software program, layout thoughts, human blunders, and environmental concerns. After establishing the diversity of universal difficulties, it then delves into the main points of the way to layout networks for fault tolerance and gives pattern calculations for particular platforms. additionally integrated is an entire, end-to-end instance exhibiting availability calculations for a pattern community.
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The important thing to remember about this section is that most telecommunications companies use the Bellcore method to calculate hardware MTBF for their products. However, because so many electronics companies use the Mil-Hdbk-217 specification, it is also acceptable. You should simply verify that MTBF estimates you get are based on one of these two standards. Computing MTTR You have a variety of ways to calculate MTTR. In this book, I am going to show a very simple way that is accurate enough for our purposes.
To calculate the availability between Segment A and Segment B, we put the results of the two paths (Routers 1 and 2 and Routers 3 and 4) into our parallel availability equation. 9 percent. 8 percent. 9996 percent, which is an excellent result. Of course, we didn't consider the downtime resulting from the non-parallel devices in this network such as Switches 1 and 2, the server, and the client. In calculations on a real-life network, you will want to include all the parts of the network. As we work through this chapter, we will add to Figure 3-3 in our discussion of the serial/parallel topology.
Figure 4-7. Calculating Component Availability Once you have the availability for each of the parts, it is time to combine those parts that are in parallel as calculated in Figure 4-8. Figure 4-8. Determining Parallel Component Availability 50 Part II: Predicting Availability Part II: Predicting Availability 51 The final step is to combine all the parts, including the parallel results, into the final system availability as calculated in Figure 4-9. Figure 4-9. Calculating the Availability of a Redundant Single System As you can see, we have performed a variety of different steps in order to arrive at our final availability figure.
High Availability Network Fundamentals by Chris Oggerino