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  • 1. ISSN: 2277 – 9043 International Journal of Advanced Research in Computer Science and Electronics Engineering Volume 1, Issue 6, August 2012 “Which cloud service provider should I opt for???” A comparative study of the various cloud service providers along with the focus onvarious techniques for optimal service selection. Lipika BoseABSTRACT— In today’s world, Cloud Computing has available to be accessed from the cloud at any time,generated a lot of interest and competition in the and from any location via the internet. There‟s noindustry. With the emergence of new Cloud Providers, need to worry about how things are being maintainedidentifying one that best suits the business needs of an behind the scenes. Customer simply purchases the ITenterprise is a challenging and difficult task. For to a service they require. Because of this, cloudnovice or user with little knowledge about cloud computing is also known as utility computing, or „IT on demand‟.computing, it is still very hard to make a reasonable Once youve decided to move to a cloud, the nextchoice. What differences are there for different cloud most important decision is to choose the right cloudproviders and what characteristics and advantages each computing service provider. Investigating thehas? To answer these problems, the characteristics, reliability and viability of a cloud provider is one ofservices and applications of several popular cloud the most complex areas faced when managing thecomputing providers are analyzed and tabulated. From cloud. The Cloud providers have their own set ofthe comparison of these providers, users can better pricing, billing, flexibility, support and otherunderstand and more reasonably choose what they important parameters in their model of computing thewant. The main aim of this paper is to focus on the service.various techniques for decision making process of There are various other methods for evaluating theoptimal service selection and to provide a brief best suitable service provider. Some of them arecomparative analysis of various cloud services. The Quality of Service Attributes like Reputation,paper begins with a glimpse of cloud computing. The Throughput, Availability, Response Time etc. Somenext section focuses on the various techniques for other factors are Maximum gain and Minimal cost foroptimal service selection. The third section presents a optimal service, Analytic Hierarchy Process andtable of comparison of some renowned cloud service many others.providers. The last section finally summarizes the wholepaper. II. OPTIMAL SERVICE SELECTION I. INTRODUCTION There are various techniques for optimal serviceCloud Computing describes highly scalable selection. Few of them are listed below.computing resources which are provided as anexternal service via the internet on a pay-as-you-gobasis. The main highlighted point of cloud computingis that customers only use what they need, and onlypay for what they actually use. Resources are 65 All Rights Reserved © 2012 IJARCSEE
  • 2. ISSN: 2277 – 9043 International Journal of Advanced Research in Computer Science and Electronics Engineering Volume 1, Issue 6, August 2012A. Quality of Service Attributes: C. CloudCmp:In order to carry out reasonable adaptations, the CloudCmp is a framework that helps a potentialfulfillment of QoS requirements has to be monitored cloud customer to estimate the performance and costsand future potential QoS values have to be predicted. of running a legacy application on a cloud withoutBased on these values, the best suitable adaptation actually deploying the application.can be selected to counter potential QoS threats. It consists of a set of benchmarking tools that areThere are various QOS attributes that should be used to compare the common services such as elasticconsidered during the service selection criteria. Some computing cluster, persistent storage, intra-cloud andof them are listed below: wide area network) and the benchmarking results are  Price then used to predict the performance and cost of a  Response Time cloud user‟s application when deployed on a cloud.  Throughput The goal of service benchmarking is to generate a  Availability cloud service‟s performance and costs profile which  Reliability includes the time to finish a task and the associatedHigher the above attributes value except price and cost.Response Time better is the quality. Response Time CloudCmp, a systematic comparator of theand Price should be low. performance and cost of cloud providers. CloudCmp measures the elastic computing, persistent storage, and networking services offered by a cloud alongB. Evaluating the Provider’s Cloud Service metrics that directly reflect their impact on the Portfolio: performance of customer applications. CloudCmp strives to ensure fairness, representativeness, andService selection decision should be such that it compliance of these measurements while limitingresults in maximum gain and minimal cost. This measurement cost.strategy benefits the SME. We can look for thefollowing characteristics of the providers:  Interoperability: For greatest interoperability value, look for a provider D. Analytic Hierarchy Process: that offers a common infrastructure platform for public and private hosted clouds, as well In Analytic Hierarchy process the problem domain is as your on-premises private cloud. For decomposed into a hierarchy of criteria and example: an enterprise can place its alternatives. This process starts with stating the application in public cloud but at the same objective of the problem then defining the criteria time its secure database in a private or on- and finally picking up the alternatives. Information is premise cloud. then arranged into a hierarchical tree. The  Service Level Agreements: SLA should be information is then synthesized to determine the read carefully. It is well said that, relative ranking of the alternatives. Remember, it‟s not about getting the “best” There are several ways to determine the ranking of SLAs; it‟s about getting the terms that are the alternatives: most meaningful to you and your business.  Using judgments‟: The judgments‟ of the  Security: Always look for a provider that concerned people can be considered for the makes security a priority. Remember when relative ranking of the alternatives. ever an enterprise enters into a cloud it is  Pair wise Comparisons: Alternatives can be entrusting its highly secured information to compared pair wise thereby importance of the third party. Ensure the provider builds one criterion over the other can be its cloud architecture for optimal protection. expressed. First a pair wise matrix is  Experience: Always look for a cloud prepared and then we get a ranking of service provider who has a record in priorities from that. managing enterprise data centers, providing secure hosting and delivering other critical applications. 66 All Rights Reserved © 2012 IJARCSEE
  • 3. ISSN: 2277 – 9043 International Journal of Advanced Research in Computer Science and Electronics Engineering Volume 1, Issue 6, August 2012 Objective Criteria 1 Criteria 2 Criteria 3 Alternative Alternative Alternative Alternative Alternative E. Weighted Difference Service Selection: transpose of the user requirement vector which yields this column vector. This service selection process involves comparison Each element of this column vector is an assessment between the user requirement criteria vector and all of conformity of the respective service to the user‟s service descriptor vectors and then selection of the requirement and the element having the minimum service which has the corresponding descriptor vector value corresponds to the most appropriate service for that best matches with the user requirement vector. the user. The user requirement criteria vector defines a vector R= [r1, r2, r3… rm] where each rj is the user‟s (decision maker‟s) minimal requirement against criteria cj belongs to C. The service descriptor vector defines a vector D= [d1, III. COMPARISION OF CLOUD PROVIDERS. d2, d3… dm] where each element dj of D represents the performance or assessment of service si under This comparison table is based on latest information criteria cj belongs to C. available on the websites of cloud providers. The In the first method, which we call Weighted contents are subject to change with time, as and when Difference (WD), we subtract the user requirement the cloud providers come up with new up gradations vector form each row of the decision matrix D. In the and features. next step we calculate the product of this matrix and Amazon Google App Windows Force.com Rackspace GoGrid AWS Engine AzureCloud Service Compute: Google Secure. Access. Apex Language Cloud Servers. Cloud Servers. Amazon Elastic Data Connector. Control. Code Editor. Cloud Files. Data Transfer.Tools Compute Private gadgets. Caching. Enhanced Cloud Sites. Cloud Storage. Cloud (EC2). Google Service Bus. Metadata Support. CloudLoad Dedicated Servers. Amazon Elastic Visualization SQLAzure Data Upgrade Wizard. Balancers. Content Delivery Network. MapReduce. API. Sync. Managed Hardware Firewall. Auto Scaling. GoogleApps SQLAzure Configurations. Load Balancer. ElasticLoad APIs . Database Managed Cloud Link. Balancing. Googleweb SQLAzure Collocation Content Delivery toolkit Import/Export Servers. Amazon IDE support. Windows Azure Dedicated CloudFront. CDN. Servers. Database Windows Azure Managed Amazon Platform Customers. Relational Management Rackspace Email Database Service Portal. Hosting. 67 All Rights Reserved © 2012 IJARCSEE
  • 4. ISSN: 2277 – 9043 International Journal of Advanced Research in Computer Science and Electronics Engineering Volume 1, Issue 6, August 2012 (RDS). Windows Azure Cloud Drive. Amazon Service Email Archiving. DynamoDB. Management.. Amazon Windows Azure SimpleDB. Product Website. Amazon SQLAzure ElastiCache. Reporting. Deployment & Management. AWS Identity and Access Management (IAM). Amazon CloudWatch. AWS Elastic Beanstalk. AWS CloudFormation. Application Services Amazon CloudSearch. Amazon Simple Workflow Service (SWF). Amazon Simple Queue . Service (SQS). Amazon Simple Notification Service (SNS). Amazon Simple Email Service (SES). Networking Amazon Route 53. Amazon Virtual Private Cloud (VPC). Operating Runtime Operating Software Operating Operating systemsPlatforms systems Java Runtime systems Unlimited real- systems Windows server 2008.supported RedHatLinux, Environment Windows 7 time Linux. Windows server 2003. Windows Server, Python Runtime Windows Server database Mac OS X. Redhat Linux 5.1. openSuSE Linux, Environment 2008 customizations. Windows. Redhat Linux 5.4. Fedora, Features Windows Vista Programmable Debian, Integration with user interface. OpenSolaris, Google Accounts Programmable Cent OS, URL Fetch cloud logic. Gentoo Linux, Mail Real-time and Oracle Linux. workflow and approvals. Real-time web sites. Real-time mobile deployment. Integrated content library. Real-time analytics. Granular security and sharing . 68 All Rights Reserved © 2012 IJARCSEE
  • 5. ISSN: 2277 – 9043 International Journal of Advanced Research in Computer Science and Electronics Engineering Volume 1, Issue 6, August 2012 Java Java .NET Apex . Net JavaLanguages PHP Python Java Java Python PHPSupported Ruby PHP VB.Net PHP Perl Windows C# Perl Java C# .NET PHP Ruby Python Python Ruby Ruby Windows language AWS Premium Free Support is Developer Basic Support, 24x7x365 Live With GoGrid, support isPremium Support Pricing available support is Premier Support, Support and available 24x7x365 at noSupport Pricing 24x7x365 from charged on a per Premier Support Expertise additional cost. Plus, everyPolicy Bronze: on-site cloud incident basis. with customer is assigned a $49/month hosting experts Administration. Silver: dedicated service team that Greater of $100 Developer ensures personalized service - or - Support is only and a smooth customer 5% of monthly available for a fee, experience. AWS usage on a per-case Gold: basis. Greater of $400 - or - 10% of monthly AWS usage for the first $0-$10K 7% of monthly AWS usage from $10K-$80K 5% of monthly AWS usage from $80K+ Platinum Greater of $15K - or - 10% of monthly AWS usage Available Available Available Available Available AvailablePrepaid planavailability Amazon The user is solely The user is solely All networking Rackspace offers Customer is responsible for Data S3:Amazon S3 responsible for responsible for components, SSL four main backup maintaining security and for backup PUT and COPY securing and securing and accelerators, load strategies for your maintaining patches and backing up the backing up the balancers, Web specific needs. operations data servers, and disaster recovery systems, Application and synchronously any Content. application Strategy 1: Daily except to the extent GoGrid store your data Google has no servers are Full Backups. specifically accepts such across multiple responsibility or configured in a It provides the responsibility by listing such facilities before liability for the redundant fastest data service features in deletion or failure configuration. restore, but comes returning Customers Signup (subject to store any with a premium SUCCESS. It All customer data cost to the limitations of liability Content and other also regularly is stored on a in Section 8 and elsewhere communications verifies the maintained or primary database Strategy 2: in this Agreement). Whether integrity of data transmitted server that is Weekly Full or not Customers Signup stored using through use of clustered with a Backup + Daily calls on GoGrid to maintain checksums.In the Service. backup database Differential back-ups, Customer will server for Backups addition, it keep a back-up copy of all redundancy It provides a calculates Daily Backup of data hosted by GoGrid. checksums on all All customer data all modified files 69 All Rights Reserved © 2012 IJARCSEE
  • 6. ISSN: 2277 – 9043 International Journal of Advanced Research in Computer Science and Electronics Engineering Volume 1, Issue 6, August 2012 network traffic to is stored on disk and directories, detect corruption storage that is since your last of data packets mirrored across full backup different storage when storing or cabinets and Strategy 3: retrieving data. controllers Weekly Full Backup + Daily Amazon RDS All customer Incremental Provides data, up to the Backups automatic backup last committed It provides a facility and transaction, is Daily Backup of automatically all modified files enable restoration backed up to a and directories, to any point primary tape since your within the library on a last backup – retention nightly basis regardless of period.It whether it was a provides free Backup tapes are Full Backup or backup storage immediately not. cloned to a up to the size of second tape Strategy 4: the provisioned library to verify Weekly Full database. their integrity, Backups Only and the clones are It is designed for SimpleDB : In moved to secure, servers that do not this data is fire-resistant, off- house data synchronously site storage on a essential to regular basis. maintaining your copied to Disaster recovery online business. multiple nodes plans are in place. Examples of such within different servers would be data centers to staging or prevent any data development loss in the event servers. of a hardware failure or network disruption. A number of backup tools have been developed by the Amazon SimpleDB ecosystem, offering simple backups of domain data to Amazon S3. Amazon EC2 It App Engine runs Filtering Routers Session security Enterprise It involves hardwareData security includes web Java applications Firewalls and auditing. firewalls,email firewalls sitting between the using the Java 6 Cryptographic Physical Security accounts include service interfaces physical and virtual virtual machine Protection of Logical Network antivirus and to configure Messages infrastructure, dedicated (JVM). The JVM Security spam protection. firewall. It also runs in a secured Software Host Security SSL capabilities layer to VLANs for every provides a way to "sandbox" Security Patch Database Security available as an account, VPN tunnels 70 All Rights Reserved © 2012 IJARCSEE
  • 7. ISSN: 2277 – 9043 International Journal of Advanced Research in Computer Science and Electronics Engineering Volume 1, Issue 6, August 2012 encrypt the API environment to Management add on service connected directly to your calls in transit isolate your centralized Transmission private data center, and with SSL to application for monitoring, Level Security dedicated circuits to the service and correlation, and maintain GoGrid cloud. security. The analysis systems confidentiality. JVM can execute Network Amazon S3 :It any Java Segmentation GoGrid also offers several provides four bytecode that Service additional security layers different access operates within Administration through its partnerships with control the sandbox Access vendors Art of Defence and mechanisms: restrictions Physical Security CohesiveFT. Art of The Python Identity and Defence‟s Hyperguard interpreter also Access distributed firewall runs in a secured Management complements and extends "sandbox" (IAM) policies, the network-based security environment to Access Control infrastructure of the GoGrid isolate your Cloud Lists (ACLs), application for bucket policies, service and and query string security authentication. IV. CONCLUSION some of the service providers provides a brief overview of them.Cloud services are an ideal way to manage all yourdigital content without limitations. While there iscertainly some overlap between each of theseservices, cloud services are unique because they V. REFERENCESallow you to view, edit and share files saved in the [1] B.Hayes, Cloud Computing. CACM, 51(7), 2008,cloud. With some services, you can even sync your pp.9-11.content across all your computers and devices. Whileno two cloud services are identical, each of the [2] P.Rolich, Cloud Computing--Redux.services reviewed provides the same fundamental TechDecisions, 12(1), 2010, 44-45.features and functionality. Some of them are [3] B.Howarth, What is Cloud Computing? CIOFeatures, Ease of Use, Help & support. In reality, (13284045), 2009, 8.there is no BEST service provider. If there was,everyone would already be using them, and there [4]W. Zeng, Y. Zhao, and J. Zeng, “Cloud servicewould be no competition. Every provider offers and service selection algorithm research,”solutions with some benefits. These benefits are up to Proceedings of the first ACM/SIGEVO Summit on Genetic and Evolutionary Computation - GEC ‟09, p.the end user to decide if they are a best fit for THEM. 1045, 2009. [Online].What are you trying to do in the cloud? Once you Available:http://portal.acm.org/citation.cfm?doid=15figure this out, you can begin to look at the different 43834.1544004companies out there and make an educated choice ontheir offerings. [5] M.Cusumano, Technology Strategy and Management: Cloud Computing and SaaS as NewThus some of the above mentioned techniques can Computing Platforms. CACM, 53(4), 2010, pp.27-29.assist a Small Medium Enterprise in decision making [6] J.Staten, Is Cloud Computing Ready For The Enterprise?, Forrester, online at:of a cloud service provider. A tabular presentation of ttp://ceria.dauphine.fr/cours98/CoursBD/doc/Forreste 71 All Rights Reserved © 2012 IJARCSEE
  • 8. ISSN: 2277 – 9043 International Journal of Advanced Research in Computer Science and Electronics Engineering Volume 1, Issue 6, August 2012r- Cloud-computing-report080307[1].pdf , 2008, Computing, 2010. [Online]. Available:accessed: 2/02/2011. http://www.usenix.org/events/hotcloud10/tech/fulln papers/Li.pdf[7] A. Li, X. Yang, S. Kandula, and M. Zhang,“CloudCmp:comparing public cloud providers,” in [9] Amazon Web Service. http://aws.amazon.com.Proceedings of the 10th annual conference onInternet measurement. ACM, 2010, pp. 1–14. [10] GoGrid Cloud Hosting. http://gogrid.com.[Online]. Available:http://portal.acm.org/citation.cfm?id=1879143. [11] Rackspace Cloud. http://www.rackspacecloud.com.[8] A. Li, X. Yang, M. Zhang, and S. Kandula,“CloudCmp : Shopping for a Cloud Made Easy,” in2nd USENIX Workshop on Hot Topics in CloudLIPIKA BOSE(B.TECH HONS-COMPUTER SCIENCE, M.TECH PURSUING-COMPUTER SCIENCE).PRESENTLY WORKING-:SOFTWARE DEVELOPER, HCL TECHNOLOGIES. 72 All Rights Reserved © 2012 IJARCSEE

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