Information Technology Reference
In-Depth Information
Figure 10.2
A traditional application life cycle, comparing system resource
availability against application resource requirements. Note that insuffi ciencies
must be met by hardware upgrades or migration to more robust equipment.
actual capacity requirements, resources can be scaled back and allocated
to other purposes through the same mechanism.
Types of Clouds
Because the term
cloud computing
refers to the configuration of resource
availability more than a specific configuration of hardware and software,
there are several common types of cloud computing that may be employed
by an organization.
• Public clouds
—These clouds are hosted on publicly accessible
systems, available for Internet access from anywhere in the world.
Examples of this type of cloud include Google's Gmail and Micro-
soft Live Hotmail services. Most public clouds share host servers
across multiple client cloud resource pools.
• Dedicated clouds
—Like public clouds, dedicated clouds are hosted
on systems available via Internet connectivity. Dedicated clouds isolate
