Mumbai University >Information Technology>Sem7>Cloud Computing

Marks: 5 M

Year: May 2011

• Cloud computing applications combine their resources into pools that can be assigned to users on demand thus attaining efficiency, increased utilization, reasonable cost & scalability.

• Key techniques for creating pools of resources are.

1. Abstraction

2. Virtualization

• Virtualization enables the creation of an abstraction layer that maps a logical address to a physical resources thus hiding the complexity & ensuring that the changes to the underlying system do not affect the client requesting a service.

• Virtualization allows efficient management of resources as the mapping for virtual resources is both dynamic & fail.

• Abstraction & virtualization are needed for following reasons.

1. Server virtualization enables different OS to share the same network & make it easy to move OS between different networks without affecting the applications running on them.

   This allows portability of application.

2. Virtualization allows many instance of application to be created thus allowing them to scale up & down as per requirement.

3. Virtualization enables load balancing thus allowing companies to handle peak loads.

4. Storage virtualization enables efficient utilization of existing resources.

5. Allows services to be provided over internet