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Step 1.Identify Data Sources and Sinks

• Estimated that：– Four client-server application A、 D、 G、 F

• Support demand access to data sets• Expect the clients to pull data form the server

– One distributed database B– Application C、 E provide remote-control acc

ess. • No clear data sources or sinks

– Computing and Storage Clusters• Feeds all applications (expect C、 E).

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Data Sources/Sinks for Application A

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Data Sources/Sinks for Application D and G

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Data Sources/Sinks for Application F

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Data Sources/Sinks for Application B

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Data Sources/Sinks for Application C and E

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Data Sources/Sinks for Computing and Storage Clusters

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Step 2.Applying Flow Boundaries

• Flow label： Application Flow Label

A fa

B fb

C/E fc/e

D/G fd/g

F ff

Computing fcomp

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Step 2.Applying Flow Boundaries

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Step 3.Applying Flow Models

• Using the flow models and flow boundaries to estimate where the backbone and composite flows are.

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Step 3.Applying Flow Models

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Step 4.Estimating Flow Distributions

Flow Flow Model Flow Boundaries

Flow Distribution

fa Client-Server Oak, SF, SJ 20/80(local/remote)

fb Client-Server SF 50/50(local/remote)

fc/e Peer-Peer Oak, SF 20/80(local/remote)

fd/g Client-Server Oak, SF 20/80(local/remote)

ff Client-Server Oak, SJ 50/50(local/remote)

fcomp Client-Server Oak, SF, SJ 20/80(local/remote)

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Step 5.Developing the Flowspec

Individual Flows

Reliability Capacity Delay

fa 99.5% 2.7 Mb/s 100 ms

fb 99.5% 53 Mb/s 25 ms

fc/e 100% 1.69 Mb/s 40 ms

fd/g 99.5% 10 Mb/s 80 ms

ff 99.5% 400 Kb/s 100 ms

fcomp 99.5% 2.7 Mb/s 100 ms

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Step 5.CF1…CF6

• CF1=CF2=(2.7)+(53)+(1.69)+(10)=67.39 Mb/s• CF3=CF4=CF5=(2.7)+(1.69)+(10)=14.39 Mb/s• CF6=(2.7)+(0.4)+(2.7)=5.8 Mb/s

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Step 5.CF1…CF6

Composite Flows

Reliability Capacity Delay

CF1 100% 67 Mb/s 25 ms

CF2 100% 67 Mb/s 25 ms

CF3 100% 14 Mb/s 40 ms

CF4 100% 14 Mb/s 40 ms

CF5 100% 14 Mb/s 40 ms

CF6 99.5% 6 Mb/s 100 ms

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Step 5.BB1/BB2

• 2((2.7)+(10)+(1.69))+(2.7)=31.48 Mb/s• (31)+(6)=37 Mb/s

Backbone Flows

Reliability Capacity Delay

BB1 100% 31 Mb/s 40 ms

BB2 100% 37 Mb/s 40 ms