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eBayeBayisaglobalphenomenon-theworld'slargestgaragesale,onlineshoppingcenter,cardealerandauctionsitewith147millionregisteredusersin30countriesasofMarch2005.Youcanfindeverythingfromencyclopediastoolivestosnowbootstostereostoairplanesforsale.AndifyoustumbleonitbeforetheeBayoverseersdo,youmightevenfindahumankidneyoravirtualdate.

eBayBasicseBayis,firstandforemost.anonlineauctionsite.YoucanbrowsethroughcategorieslikeAntiques,Boats,Clothing&Accessories,Computers&Networking,Jewelry&WatchesandVideoGames.Whenyouseesomethingyoulike,youclickontheauctiontitleandviewthedetails,includingpictures,descriptions,paymentoptionsandshippinginformation.

Ifyouplaceabidonanitem,youenteracontractualagreementtobuyitifyouwintheauction.Allauctionshaveminimumstartingbids,andsomehaveareserveprice-asecretminimumamounttheselleriswillingtoacceptfortheitem.Ifthebiddingdoesn'treachthereserveprice,thesellerdoesn'thavetopartwiththeitem.Inadditiontoauctions,youcanfindtonsoffixed-priceitemsoneBaythatmakeshoppingtherejustlikeshoppingatanyotheronlinemarketplace.Youseewhatyoulike,youbuyit,youpayforitandyouwaitforittoarriveatyourdoor.

YoucanpayforanitemoneBayusingavarietyofmethods,includingmoneyorder,cashier'scheck,cash,personalcheckandelectronicpaymentserviceslikePayPalandBidPay.It'suptoeachsellertodecidewhichpaymentmethodshe'llaccept.JustasyoucanbuyalmostanythingoneBay,youcansellalmostanything,too.Usingasimplelistingprocess,youcanputallofthejunkinyourbasementupforsaletothehighestbidder.WhenyousellanitemoneBay,youpaylistingfeesandturnoverapercentageofthefinalsalepricetoeBay.onceyouregister(forfree)witheBay,youcanaccessallofyoureBaybuyingandsellingactivitiesinasinglelocationcalled"MyeBay."

eBayInfrastructureAseriesofservicedisruptionsin1999causedrealproblemsforeBay'sbusiness.Overthecourseofthreedays,overloadedserversintermittentlyshutdown,meaninguserscouldn'tcheckauctions,placebidsorcompletetransactionsduringthatperiod.Buyers,sellersandeBaywereveryunhappy,andacompleterestructuringofeBay'stechnologicalarchitectureFollowed.In1999,eBaywasonemassivedatabaseserverandafewseparatesystemsrunningthesearchfunction.In2005,eBayisabout200databaseserversand20searchservers.

Thearchitectureisatypeofgridcomputingthatallowsforbotherrorcorrectionandgrowth.Withtheexceptionofthesearchfunction,everythingabouteBaycanactuallyrunonapproximately50servers-Webservers,applicationserversanddata-storagesystems.Eachserverhasbetween6and12microprocessors.These500rsoserversrunseparately,buttheytalktoeachother,soeverybodyknowsifthereisaproblemsomewhere.eBaycansimplyaddserverstothegridastheneedarises.Whilethemajorityofthesitecanrunon50servers,eBayhasfourtimesthat.The200serversarehousedinsetsof50infourlocations,allintheUnitedStates.Whenyou'reusingeBay,youmaybetalkingtoanyoneofthoselocationsatanytime-theyallstorethesamedata.Ifoneofthesystemscrashes.therearethreeotherstopickuptheslack.

Whenyou'reontheeBayWebsiteandyouclickonalistingforaPersianrug,yourcomputertalkstoWebservers,whichtalktoapplicationservers,whichpulldatafromstorageserverssoyoucanfindoutwhatthelatestbidpriceisandhowmuchtimeisleftintheauction.eBayhaslocalpartnersinmanycountrieswhodelivereBay'sstaticdatatocutdownondownloadtime,andtherearemonitoringsystemsin45citiesaroundtheworldthatconstantlyscanforproblemsinthenetwork.