SLA violation avoidance
Wednesday, February 10, 2010
10:08 AM
SLA violation avoidance:
Estimate M = max (ΔP/Δt) = the amount that P can grow by in one cycle. 
Estimate N = tdeploy/Δt = number of measurement cycles needed to deploy an instance. 
If P+NM > PSLA, we are risking a violation; add application instances to cope. 
Thus P < PSLA - NM ≡ Psafe
Defining Psafe ≡ tsafe+tnetwork+tcloud, 
we get tsafe = tSLA - NM
                     = tSLA -   tdeploy/Δt  max (ΔP/Δt).