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Scaling in should be more conservative than scaling out because

  • A.the load balancer prevents any instance being removed
  • B.removing capacity too eagerly risks an outage if load returns
  • C.instances cost nothing at all while they sit idle
  • D.scaling in is technically much harder than scaling out

Answer: B

The cost of being slightly overprovisioned is small and predictable, while the cost of being short is an outage. Asymmetric thresholds are the usual arrangement. Being a little overprovisioned is a cost; being underprovisioned is an incident.

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