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Availability Pilegaard Hansen Sharp 02<br />
Clients C1, C2, . . . exchange messages with a server S<br />
C1<br />
.<br />
Cn<br />
.<br />
Ci → S : M<br />
S → Ci : M ′<br />
• Good clients i ∈ γ requests δi of the server’s time<br />
• Bad clients j ∈ β waste the server’s time<br />
How to formalize requirements about the availability?<br />
• E.g., Available for good clients x% of the time<br />
Under which assumptions are these requirements to be met?<br />
• strength of bad clients Operational cost model Meadows 01<br />
S<br />
Tallinn, November 17- 21, Michael R. Hansen – p.26/29
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