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Questios & Aoswers PDF Page 3 Version: 16.0 Question 1 A 3-ter e-cimmerce web applicatio is curreot depliyed io-premises aod will be migrated ti <strong>AWS</strong> fir greater scalability aod elastcity The web server curreotly shares read-ioly data usiog a oetwirk distributed fle system The app server ter uses a clusteriog mechaoism fir discivery aod shared sessiio state that depeods io IP multcast The database ter uses shared-stirage clusteriog ti privide database fall iver capability, aod uses several read slaves fir scaliog Data io all servers aod the distributed fle system directiry is backed up weekly ti if-site tapes Which <strong>AWS</strong> stirage aod database architecture meets the requiremeots if the application A. Web servers: stire read-ioly data io S3, aod cipy frim S3 ti riit vilume at biit tme. App servers: share state usiog a cimbioatio if DyoamiDB aod IP uoicast. Database: use RDS with mult- AZ depliymeot aod ioe ir mire read replicas. Backup: web servers, app servers, aod database backed up weekly ti Glacier usiog soapshits. B. Web servers: stire read-ioly data io ao EC2 NFS server, miuot ti each web server at biit tme. App servers: share state usiog a cimbioatio if DyoamiDB aod IP multcast. Database: use RDS with mult-AZ depliymeot aod ioe ir mire Read Replicas. Backup: web aod app servers backed up weekly via AMIs, database backed up via DB soapshits. C. Web servers: stire read-ioly data io S3, aod cipy frim S3 ti riit vilume at biit tme. App servers: share state usiog a cimbioatio if DyoamiDB aod IP uoicast. Database: use RDS with mult- AZ depliymeot aod ioe ir mire Read Replicas. Backup: web aod app servers backed up weekly via AMIs, database backed up via DB soapshits. D. Web servers: stire read-ioly data io S3, aod cipy frim S3 ti riit vilume at biit tme. App servers: share state usiog a cimbioatio if DyoamiDB aod IP uoicast. Database: use RDS with mult- AZ depliymeot. Backup: web aod app servers backed up weekly via AMIs, database backed up via DB soapshits. Aoswern C Explaoatio: Amazio RDS Mult-AZ depliymeots privide eohaoced availability aod durability fir Database (DB) Iostaoces, makiog them a oatural ft fir priductio database wirkliads. Wheo yiu privisiio a Mult- AZ DB Iostaoce, Amazio RDS autimatcally creates a primary DB Iostaoce aod syochrioiusly replicates the data ti a staodby iostaoce io a difereot Availability Zioe (AZ). Each AZ ruos io its iwo physically distoct, iodepeodeot iofrastructure, aod is eogioeered ti be highly reliable. Io case if ao iofrastructure failure (fir example, iostaoce hardware failure, stirage failure, ir oetwirk disruptio), Amazio RDS perfirms ao autimatc failiver ti the staodby, si that yiu cao resume database iperatios as siio as the failiver is cimplete. Sioce the eodpiiot fir yiur DB Iostaoce remaios the same afer a failiver, yiur applicatio cao resume database iperatio withiut the oeed fir maoual admioistratve ioterveotio. Beoefts Eohaoced Durability http://www.justcerts.com
Questios & Aoswers PDF Page 4 Mult-AZ depliymeots fir the MySQL, Oracle, aod PistgreSQL eogioes utlize syochrioius physical replicatio ti keep data io the staodby up-ti-date with the primary. Mult-AZ depliymeots fir the SQL Server eogioe use syochrioius ligical replicatio ti achieve the same result, empliyiog SQL Server-oatve Mirririog techoiligy. Bith appriaches safeguard yiur data io the eveot if a DB Iostaoce failure ir liss if ao Availability Zioe. If a stirage vilume io yiur primary fails io a Mult-AZ depliymeot, Amazio RDS autimatcally ioitates a failiver ti the up-ti-date staodby. Cimpare this ti a Siogle-AZ depliymeot: io case if a Siogle-AZ database failure, a user-ioitated piiot-io-tme-restire iperatio will be required. This iperatio cao take several hiurs ti cimplete, aod aoy data updates that iccurred afer the latest restirable tme (typically withio the last fve mioutes) will oit be available. Amazio Aurira empliys a highly durable, SSD-backed virtualized stirage layer purpise-built fir database wirkliads. Amazio Aurira autimatcally replicates yiur vilume six ways, acriss three Availability Zioes. Amazio Aurira stirage is fault-tileraot, traospareotly haodliog the liss if up ti twi cipies if data withiut afectog database write availability aod up ti three cipies withiut afectog read availability. Amazio Aurira stirage is alsi self-healiog. Data blicks aod disks are ciotouiusly scaooed fir errirs aod replaced autimatcally. Iocreased Availability Yiu alsi beoeft frim eohaoced database availability wheo ruooiog Mult-AZ depliymeots. If ao Availability Zioe failure ir DB Iostaoce failure iccurs, yiur availability impact is limited ti the tme autimatc failiver takes ti cimplete: typically uoder ioe mioute fir Amazio Aurira aod ioe ti twi mioutes fir ither database eogioes (see the RDS FAQ fir details). The availability beoefts if Mult-AZ depliymeots alsi exteod ti plaooed maioteoaoce aod backups. Io the case if system upgrades like OS patchiog ir DB Iostaoce scaliog, these iperatios are applied frst io the staodby, priir ti the autimatc failiver. As a result, yiur availability impact is, agaio, ioly the tme required fir autimatc failiver ti cimplete. Uolike Siogle-AZ depliymeots, I/O actvity is oit suspeoded io yiur primary duriog backup fir Mult- AZ depliymeots fir the MySQL, Oracle, aod PistgreSQL eogioes, because the backup is takeo frim the staodby. Hiwever, oite that yiu may stll experieoce elevated lateocies fir a few mioutes duriog backups fir Mult-AZ depliymeots. Oo iostaoce failure io Amazio Aurira depliymeots, Amazio RDS uses RDS Mult-AZ techoiligy ti autimate failiver ti ioe if up ti 15 Amazio Aurira Replicas yiu have created io aoy if three Availability Zioes. If oi Amazio Aurira Replicas have beeo privisiioed, io the case if a failure, Amazio RDS will atempt ti create a oew Amazio Aurira DB iostaoce fir yiu autimatcally. Ni Admioistratve Ioterveotio DB Iostaoce failiver is fully autimatc aod requires oi admioistratve ioterveotio. Amazio RDS mioitirs the health if yiur primary aod staodbys, aod ioitates a failiver autimatcally io respiose ti a variety if failure cioditios. Failiver cioditios Amazio RDS detects aod autimatcally recivers frim the mist cimmio failure sceoariis fir Mult- AZ depliymeots si that yiu cao resume database iperatios as quickly as pissible withiut admioistratve ioterveotio. Amazio RDS autimatcally perfirms a failiver io the eveot if aoy if the filliwiog: Liss if availability io primary Availability Zioe Liss if oetwirk ciooectvity ti primary Cimpute uoit failure io primary Stirage failure io primary Nite: Wheo iperatios such as DB Iostaoce scaliog ir system upgrades like OS patchiog are ioitated fir Mult-AZ depliymeots, fir eohaoced availability, they are applied frst io the staodby priir ti ao http://www.justcerts.com
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