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L3.sp11 - CS 525 Advanced Distributed Systems Spring 2011...

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1 Yeah! That’s what I’d like to know. Indranil Gupta (Indy) Lecture 3 Cloud Computing Continued January 25, 2011 CS 525 Advanced Distributed Systems Spring 2011 All Slides © IG (Acknowledgments: Md Yusuf Sarwar and Md Ahsan Arefin)
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2 Timesharing Industry (1975): Market Share: Honeywell 34%, IBM 15%, •Xerox 10%, CDC 10%, DEC 10%, UNIVAC 10% •Honeywell 6000 & 635, IBM 370/168, Xerox 940 & Sigma 9, DEC PDP-10, UNIVAC 1108 Grids (1980s-2000s): GriPhyN (1970s-80s) •Open Science Grid and Lambda Rail (2000s) •Globus & other standards (1990s-2000s) First large datacenters: ENIAC, ORDVAC, ILLIAC Many used vacuum tubes and mechanical relays P2P Systems (90s-00s) Many Millions of users Many GB per day Data Processing Industry - 1968: $70 M. 1978: $3.15 Billion. Berkeley NOW Project Supercomputers Server Farms (e.g., Oceano) “A Cloudy History of Time” © IG 2010 Clouds
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3 So What’s new in Today’s Clouds? Besides massive scale, three major features: I. On-demand access : Pay-as-you-go, no upfront commitment. Anyone can access it (e.g., Washington Post – Hillary Clinton example) I. Data-intensive Nature : What was MBs has now become TBs. Daily logs, forensics, Web data, etc. Do you know the size of Wikipedia dump? I. New Cloud Programming Paradigms : MapReduce/Hadoop, Pig Latin, DryadLinq, Swift, and many others. High in accessibility and ease of programmability Combination of one or more of these gives rise to novel and unsolved distributed computing problems in cloud computing.
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4 OK, so that’s what a cloud looks like today. Now, suppose I want to start my own company, Devils Inc. Should I buy a cloud and own it, or should I outsource to a public cloud?
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5 Single site Cloud: to Outsource or Own ? [OpenCirrus paper] Medium-sized organization: wishes to run a service for M months Service requires 128 servers (1024 cores) and 524 TB Same as UIUC CCT cloud site Outsource (e.g., via AWS): monthly cost S3 costs: $0.12 per GB month. EC2 costs: $0.10 per Cpu hour Storage ~ $62 K Total ~ $136 K Own : monthly cost Storage ~ $349 K / M Total ~ $ 1555 K / M + 7.5 K (includes 1 sysadmin / 100 nodes) using 0.45:0.0.4:0.15 split for hardware:power:network
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6 Single site Cloud: to Outsource or Own ? Breakeven analysis: more preferable to own if : $349 K / M < $62 K (storage) $ 1555 K / M + 7.5 K < $136 K (overall) Breakeven points M > 5.55 months (storage) Not surprising: Cloud providers benefit monetarily most from storage M > 12 months (overall) Assume hardware lasts for 3 years (typical lifetime) Systems are typically underutilized With system utilization of x%, still more preferable to own if: x > 33.3% Even with CPU util of 20% (typical value for industry clouds, e.g., at Yahoo), storage > 47% makes owning preferable
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7 I want to do research in this area. I am sure there are no grand challenges in cloud computing!
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8 10 Challenges [Above the Clouds] (Index: Performance Data-related Scalability Logisitical) Availability of Service : Use Multiple Cloud Providers; Use Elasticity; Prevent DDOS Data Lock-In : Enable Surge Computing; Standardize APIs Data Confidentiality and Auditability : Deploy Encryption, VLANs,
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