A cloud service provider fo rPwnMe.Com
uses 50 percent of its data center equipment to setup a cloud infrastructure.
The remaining equipment is used for internal operations and for testing. The
cloud infrastructure consists of a hypervisor cluster. A resource pool is
created by aggregating the available resources of the hypervisor cluster. The
cloud infrastructure is used to provide compute services. The services are
allocated necessary processing power and memory resources from the resource
The hypervisor cluster is
composed of 10 identical physical compute systems containing 2 redundant
(passive) compute systems. This means that the cluster can absorb up to two
compute system failures and continue to support all services at the same level
of performance. The available processing power and memory per physical compute
system in the cluster is equal to 19.2 GHz and 64 GB respectively. The existing
resources in the data center can meet capacity requirement of services in
short‐term. However, the provider should procure and provision additional
resources as required to avoid the capacity issues in future. Further, the
provider is concerned about security attacks that may compromise the
hypervisors running on the physical compute systems. The provider should take
control measures to protect against such attacks.
The capacity management process
in a service provider’s organization is shown in the figure. The process
comprises several activities, shown in rectangular boxes. The process also
consists of conditions. They allow the process to branch into different
directions, depending on whether the conditions are met or not.
Given: The thresholds for over utilization and
underutilization of resources are 70 percent and 40 percent utilization of
total resource capacity respectively. These are used to determine whether the
resource pool is over utilized or underutilized.
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