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Question 3: Ready-Made Environment A is hosted by Virtual Server A and Ready-Made Environments is
hosted by Virtual Server B.
Virtual Servers A and B are hosted by Hypervisor A, which is part of a hypervisor cluster. An
automated scaling listener intercepts cloud consumer requests and automatically invokes the
on-demand generation of additional instances of ready-made environments, as required.
A self-service portal and a usage and administration portal are also available to cloud consumers.
The self-service portal can be used to request the provisioning of a new ready-made environment.
Any cloud consumer that has already had a ready-made environment provisioned can configure and
view information about that ready-made environment via the usage and administration portal.
Cloud Consumer A accesses Ready-Made Environment A to work on the development of a new
cloud service (1). Cloud Consumer B accesses Ready-Made Environment B to test a recently
completed application comprised of three cloud services (2). Cloud Consumer C accesses the
self-service portal to request the creation of a new ready-made environment (3).
The cloud provider is required to perform an emergency maintenance outage on a cloud storage
device used by all ready-made environments. The unplanned outage takes two hours. During this
period, Cloud Consumers A and B are unable to access Ready-Made Environments A and B and
Cloud Consumer C receives an error when submitting a request to create a new ready-made
environment.
After the maintenance outage is over, Cloud Consumers A and B encounter the following problems:
-Cloud Consumer A is unable to recover session data that was kept in memory for an extended
period, prior to the time of the outage. -Cloud Consumer B has no access to Virtual Server B, which
was moved to Hypervisor B during
the maintenance outage. When Cloud Consumer B attempts to ping Virtual Server B, the
request times out.
Even though Cloud Consumer C is able to log into the usage and administration portal to confirm
that its ready-made environment was successfully provisioned, the unexpected outage has raised
concerns about the stability of the ready-made environment's underlying infrastructure. Cloud
Consumer C informs the cloud provider that it cannot proceed with its lease of the ready-made
environment if there are future occurrences of this type of maintenance outage.
Which of the following statements can help address the problems and concerns of the three cloud
consumers?
A. A combination of the Load Balanced Virtual Server Instances and Synchronized Operating State
patterns can be applied to establish a system capable of deferring state across multiple cloud
storage devices, each located on a different virtual server. The Elastic Disk Provisioning pattern can
be applied to persist virtual server configuration data across hypervisors so that connectivity is
preserved whenever a virtual server is relocated to a different hypervisor. The Zero Downtime
pattern can be applied to ensure that none of the ready-made environments or virtual servers are
subject to a maintenance outage in the future.
B. The Elastic Disk Provisioning and Cross-Storage Device Vertical Tiering patterns can be applied to
establish a cloud architecture that supports a set of cloud storage devices, each with different tiers
that cloud consumers can choose to scale to The Synchronized Operating State pattern can be
applied in combination with the Hypervisor Clustering pattern to avoid further virtual server and
ready-made environment connectivity problems. The Redundant Storage pattern can be applied so
that if a cloud storage device fails, a secondary implementation of the cloud storage device
automatically takes over processing tasks, thereby avoiding outages.
C. The Service State Management pattern can be appliedto establish a system that canpersist
session data in a database. The Persistent Virtual Network Configuration pattern can be applied to
centralize the configuration data necessary for virtual servers to remain accessible after they have
been relocated to different hypervisors. The Storage Maintenance Window pattern can be applied
to establish a system that allows cloud storage devices to be maintained without causing outages.
D. None of the above.
Correct Answer: C

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