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Lesson5CloudComputing:ABriefIntroductionNumeroussurveysreportthatCloudComputingwillbeatop10technologythatenterprisebusinessmanagersneedtobeawareoffor2010.Notthatyoucanescapethemarketingandinformationpublishedaboutthislatestsuperhypedtopic.MuchofthemessagefocusesonCloudComputingasalowercostdeliverymodelforITservices.Thismayormaynotbetrue.SoWhatisCloudComputing?WeseeCloudComputingasacomputingmodel,notatechnology.Inthismodel“customers”plugintothe“cloud”toaccessITresourceswhicharepricedandprovided“on-demand”.Essentially,ITresourcesarerentedandsharedamongmultipletenantsmuchasofficespace,apartments,orstoragespacesareusedbytenants.DeliveredoveranInternetconnection,the“cloud”replacesthecompanydatacenterorserverprovidingthesameservice.Thus,CloudComputingissimplyITservicessoldanddeliveredovertheInternet.RefertosectionofTypesofCloudComputing.CloudComputingvendorscombinevirtualization(onecomputerhostingseveral“virtual”servers),automatedprovisioning(servershavesoftwareinstalledautomatically),andInternetconnectivitytechnologiestoprovidetheservice[1].Thesearenotnewtechnologiesbutanewnameappliedtoacollectionofolder(albeitupdated)technologiesthatarepackaged,soldanddeliveredinanewway.Akeypointtorememberisthat,atthemostbasiclevel,yourdataresidesonsomeoneelse’sserver(s).Thismeansthatmostconcerns(andtherearepotentiallyhundreds)reallycomedowntotrustandcontrolissues.Doyoutrustthemwithyourdata?TheEconomicsEconomiesofscaleandskilldriveCloudComputingeconomics.AswithrentedRealEstate,thecostsofownershiparepooledandspreadamongalltenantsofthemulti-tenantCloudComputingsolution.Consequentially,acquisitioncostsarelowbuttenantsneverownthetechnologyassetandmightfacechallengesiftheyneedto“move”orendtheserviceforanyreason[2].SomethingthatisoftenoverlookedwhenevaluatingCloudComputingcostsisthecontinuedneedtoprovideLANservicesthatarerobustenoughtosupporttheCloudsolution.Thesecostsarenotalwayssmall.Forexample,ifyouhave6ormoreworkstationcomputers,youwillprobablyneedtocontinuetomaintainaserverina
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