Information Technology Reference
In-Depth Information
Figure 10.3
A virtualized or cloud computing application life cycle, comparing
system resource availability against application resource requirements. Note
that incremental changes, both positive and negative, are possible through
automated allocation, without requiring migration or hardware upgrade.
instances by restricting resource use by a particular client to a specific
subset of hosting systems. Because the resources are dedicated to a
particular client, these services are generally more costly than public
cloud implementations.
• Private clouds
—A private cloud is one that is typically maintained
within an organization's own network, or isolated in some manner
from external access. Cloud hosting services may place dedicated
hardware within the organization's data center, or an organization
might construct a private cloud using its own hardware.
• Hybrid clouds
—Hybrid clouds may provide a mixture of dedi-
cated, public, and private cloud resources. Management of disas-
ter recovery (DR) functions, service-level agreements for resource
and network availability, and other characteristics must be care-
fully negotiated in order to obtain the greatest value from a hybrid
cloud configuration.
