Cloud computing Cloud computing is using the internet

Cloud computing ? • Cloud computing is using the internet to access someone else's software running on someone else's hardware in someone else's data center.

NIST Cloud Definition “The National Institute of Standards and Technology (NIST) defines cloud computing as a "pay-per-use model for enabling available, convenient and ondemand network access to a shared pool of configurable computing resources (e. g. , networks, servers, storage, applications and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction. " 3 April 2009

Architecture NIST Visual Model of Cloud Computing Definition 4

Cloud Computing - Services Software as a Service - Saa. S Platform as a Service - Paa. S Infrastructure as a Service - Iaa. S

Cloud Deployment Models • • Public Cloud. Private Cloud. Community Cloud. Hybrid Cloud. 6

Cloud Security Forum Ref. Architecture 10/15/2013 Cloud Reference Architecture(s) IIT-RTC 7

Grid Vs Cloud • Common to both – Maximise the use of existing resources – Economise computing cost – Uses abstraction extensively ( concepts looks similar) • Grid – one large job is divided into many small portions and executed on multiple machines. – Meant for large scale computing • Cloud – allow the users to avail of various services without investing in the underlying architecture ( HW, SW, NW) – offers many different services, from web hosting, right down to word processing

Grid Vs Cloud Grid Computing Cloud Computing Access to Shared computing power, storage and other resources Access to Leased computing power, storage and other resources Big Org. pay for the services ( Univ. / Govt) Users pay for the leased services Managed by providers and Users ( Univ. / Govt) Managed by Cloud providers only. No role for user. Big Org. Provide the services ( Univ. / Govt/ Research org. ) Commercial companies provide services Handles huge amount of data, complex calculations ( e. g. weather forecast) Handles reasonable amount of data for commercial and other org. Uses open source technology Uses proprietary technology Suitable for research org. to carry out tasks like global climate modelling etc. . Suitable for business houses to effectively use computing without investing