Compute Virtualization

Definition :

             It is a technique of masking or abstracting the physical compute hardware and enabling multiple operating systems (OSs) to run concurrently on a single or clustered physical machine(s).

•  Enables creation of multiple virtual machines (VMs), each running an OS and application
• VM is a logical entity that looks and behaves like physical machine
• Virtualization layer resides between hardware and VMs, Also known as hypervisor
• VMs are provided with standardized hardware resources

Compute Virtualization

Memory Virtualization in Storage Management

•      An OS feature that presents larger memory to the application than physically available

4  Additional memory space comes from disk storage

4  Space used on the disk for virtual memory is called ‘swap space/swap file or page file.

4  Inactive memory pages are moved from physical memory to the swap file

4  Provides efficient use of available physical memory

4  Data access from swap file is slower – use of flash drives for swap space gives best performance 

Cloud Computing

Cloud Computing

•      Enables individuals and organizations to use IT resources as a service over network

•      Enables self-service requesting and automates request-fulfillment process

8  Enables users to scale up or scale down the usage of computing resources quickly

•      Enables consumption-based metering

8  Consumers pay only for the resources they use

8  Example: CPU hours used, amount of data transferred, and Gigabytes of data stored

Virtualization in Information storage management

Virtualization is a technique of abstracting physical resources and making them appear as logical resources

4  For example partitioning of raw disks

Pools physical resources and provides an aggregated view of physical resource capabilities

Virtual resources can be created from pooled physical resources

4  Improves utilization of physical IT resources

Why Information Storage and Management?

•Information is the knowledge derived from data

•Growth of digital information has resulted in information explosion

•We live in an on-command, on-demand world

Ø We need information when and where required

•Increasing dependency on fast and reliable access to information

•Businesses seek to store, protect, optimize, and leverage the information

Ø To gain competitive advantage

Ø To derive new business opportunity