9) is used first to estimate where flows will be, and then the second method (Figure 4.10) is used to simplify the flow diagram. 170 CHAPTER 4 Flow Analysis 40 67 45 Servers (4) 14 22 Storage Servers 51 Compute 88 Servers (2) Storage Server 60 74 Servers (2) Digital Video Several devices of same type in same location are combined, single number given Storage devices are shown as well as servers Other specialized devices, if part of the application or user group, are also shown South Campus Central Campus North Campus FIGURE 4.8 A Map of Device Locations for a Network 40 45 Servers (4) 14 22 Storage Servers 74 Servers (2) Digital Application 1 flows from user Video devices to temporary storage server Application 1 flows from 22 devices to tertiary storage server Application 1 flows from video device to storage server South Campus Central Campus North Campus 67 Application 1 flows from user devices to temporary storage server Storage Server 14 60 Compute Servers (2) 51 Application 1 flows between servers FIGURE 4.9 Flows Estimated between Devices for Application 1 In Figure 4.10 flows F1, F2, and F3 represent the singlesession performance requirement for each building for Application 1. At some point in this process the performance requirement will need to be modified to represent the estimated performance required by all users in each building (40, 67, and 45 users in the Identifying and Developing Flows 171 40 67 Servers (4) F1, F2, F3: 100 Kb, 100% F4: 500 Kb, 100% Central Campus F1 F2 45 F3 F4 To North Campus Storage Server Bldg A Bldg B Bldg C FIGURE 4.10 Performance Information Added to Central Campus Flows for Application 1 buildings at Central Campus). F4 represents the performance requirement for the server–server flow between Central and North Campuses. Note that in this figure flows F1 and F2 are between Buildings AB and C, while flow F3 is between devices. Since the 45 user devices and four servers are in the same building, we have to show the flows between devices. If we were showing flows within Building C, it would look like Figure 4.11. This diagram also introduces a flow aggregation point, which allows us to show multiple flows being consolidated at a location. This is useful in the design process, 40 67 Bldg A Bldg B Central Campus Servers User Devices (45) ... Bldg C F1 F2 F3 F4 Combination of F1, F2, F3 To North Campus Storage Server Flow Aggregation Point FIGURE 4.11 Central Campus Flows for Application 1 Expanded with Building C 172 CHAPTER 4 Flow Analysis F1 F2 F3 Without a flow aggregation point, all flows are shown individually between buildings F1 F2 F3 With a flow aggregation point, flows converge to form flow F4 F4 Flow Aggregation Point (network technologies may be applied at this point during design process) FIGURE 4.