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Oracle Grid on DELL Enterprise Dell International Inc., Korea Dell International Inc., Korea 컨설팅 컨설팅 사업부 사업부 정진일 정진일 차장 차장

04 Oracle Grid on Dell Enterprise 20060517 · 2006-07-12 · on Oracle 10gLinux for GEDIS. The Proof is in The Performance Speed 77% faster UNIX Price 49% less UNIX Dell 2-processor

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Oracle Gridon DELL Enterprise

Dell International Inc., Korea Dell International Inc., Korea 컨설팅컨설팅 사업부사업부

정진일정진일 차장차장

Agenda

• Dell | Oracle Partnership• Value Proposition• Performance• One Source• Q&A

About Grid Computing…

Oracle 10g – 주요 특징

Dell | OraclePartnership

Fastest growing tier-1 hardware vendor in the Oracle database market #1 Oracle Reseller in 2003Up to 250,000 transactions per hour* within Dell IT on mission critical system

Oracle Global IT operations using >2,000 Dell|Linux serversUsing Dell servers in the Austin Data Center for OutsourcingDevelops Linux-based software on Dell servers

*Dell’s Sales ODS database is processing over 250,000 transactions per hour in peak hours. It is also responding to 100,000+ queries/requests per hour at the same time. (as of April 2003)

Dell | | Oracle PartnershipPartnership

1997. Dell|Oracle Partnership Formed

Dell | | Oracle | | Linux alliancealliance

Oracle은 Dell Power Edge Server를 사용하여Red-Hat Linux상에서 Core Product를 개발합니다.

Oracle은 Dell Power Edge Server를 사용하여Red-Hat Linux상에서 Core Product를 개발합니다.

Intel

OracleRed Hat

Dell

IDOL Program

IDOL프로그램은 Intel, Dell, Oracle, Red Hat Linux를 통한Unix Migration Solution입니다.

IDOL프로그램은 Intel, Dell, Oracle, Red Hat Linux를 통한Unix Migration Solution입니다.

Joint Messaging to the CustomerJoint Messaging to the Customer

The The DellDell | | Oracle Value PropositionValue Proposition

“We can take four inexpensive Dell machines and group them together and run them faster than a Unix machine at a tiny fraction of the cost. And it’s much more reliable, because if one of the Dell computers fails, three are left to keep the system running.”

- Larry Ellison, Chairman and CEO, Oracle Corporation

Oracle Chief Executive Larry Ellison said his company had "no more important partner than Dell" when it comes to expanding the reach of its technology and lowering customers costs.

- Rex Crum, CBS.MarketWatch.com

Oracle & Dell Joint DevelopmentOracle & Dell Joint Development

• All Oracle applications run on Dell servers

• Two operating systems– Microsoft® Windows®– Red Hat® Linux® Advanced

Server

• Best Practices Program– White papers– Installation guides, tools– Benchmarks– Joint Support ServicesYYDeveloper tools

YYSmall Business Suite

YYCollaboration Suite

YYE-Business Suite

YYApplication Server

YYRAC (parallel cluster)

YYDatabase

LinuxWindowsORACLE Product

Real Business BenefitsReal Business Benefits

Reduce Cost:• Pre-defined되고, pre-tested 된 technology combination은 Downtime최소화 및

Grid 인프라를 통한 Deployment & Management의 단순화를 통해 비용절감을돕는다.

Improve Quality of Service: • End-to-end testing, validation, and documentation등으로 신뢰성있는 Service

Level을 제공, 빠른 응답시간을 요하는 Business를 위한 IT를 가능하게 합니다.

Reduce Risk: • 입증된 solution들과 cooperative engineering을 통한 Downtime의 최소화와 신

속한 유지보수 및 그에 대한 프로세스를 제공합니다.

Manage Growth: • Dell|Oracle solution은 확장성 및 집중된 관리를 통하여 낮은 비용으로 H/W 및

사용자의 성장을 도모하도록 디자인됩니다.

Accelerate Time to Value:• Pre-tested되고 입증된 최고의 성능은 고객의 Deployment Time을 빠르게 한다.

Dell and Oracle Dell and Oracle –– Beyond the BoxBeyond the Box

• Dell is an authorized reseller of Oracle products• Database 9i and 10g

• Application Server 9i and 10g

• Real Application Clusters (RAC) 9i and 10g

• Collaboration Suite

• Standard Edition One – database for small business

• Oracle Product Support

• Comprehensive Professional Services• Sizing, Installation, Deployment, Tuning

Value PropositionValue Proposition

The Momentum and Value of StandardsThe Momentum and Value of Standards

Dell drives standards in the industry…

Desktops Desktops -- 98% standardized:98% standardized:Dell #1 worldwideDell #1 worldwide11

x86 Servers x86 Servers -- 90% standardized90% standardized33::Dell #1 US, China (PRC)Dell #1 US, China (PRC)11

Workstations Workstations -- 87% standardized:87% standardized:Dell #1 worldwideDell #1 worldwide22

The datacenter is moving to standards

Disk Storage Disk Storage -- standardizing:standardizing:Dell #4 WorldwideDell #4 Worldwide44

Sources: Sources: 1 1 IDC Worldwide Quarterly PC Tracker, Nov 15, 2004 IDC Worldwide Quarterly PC Tracker, Nov 15, 2004 2 2 IDC Worldwide Workstation IDC Worldwide Workstation QViewQView Q3 2004 Q3 2004 33IDC Worldwide Quarterly Server Tracker, Q3 2004 IDC Worldwide Quarterly Server Tracker, Q3 2004 4 4 IDC IDC Worldwide Quarterly Disk Storage Systems Tracker Q3 2004. StandaWorldwide Quarterly Disk Storage Systems Tracker Q3 2004. Standardization is defined as open, nonrdization is defined as open, non--proprietary architectureproprietary architecture

X86-32 X86-64 RISC

1.8M

1.6M

1.4M

1.2M

1M

800K

600K

400K

200K

US Unit Shipments

x86 architecture share continued to grow and reached 91% of overall server units.

Customers Are Voting With Their $$$Customers Are Voting With Their $$$x86 vs. RISCx86 vs. RISC

Source: IDC reports

96 97 98 99 00 01 02 03 04 05

LAN

Storage Area Network (SAN)Storage Area Network (SAN)

Network Attached Storage (NAS)Network Attached Storage (NAS)Direct Attached Storage (DAS)Direct Attached Storage (DAS)

Dell | EMCFC Switch

Dell | EMCStorage Enclosure

PowerVault136T DLT Library

PowerEdge 6850Servers

PowerEdge 6850 Servers w/ Dell | EMC Storage Enclosure

& DLT Drive/Autoloader

PowerEdge 6850Servers w/PowerVault 220S

Disk Subsystem

PowerVault 745N

Dell | EMC NS500GNAS on SAN

Enterprise Total Solution providerEnterprise Total Solution provider

Enterprise Total Solution providerEnterprise Total Solution provider

• Client (Desktop, Notebook, Workstation, Monitor, Print, etc)• Server (Tower, Rack, 1way,2way,4way & Blade)• Storage (DAS, NAS, SAN)• Switch (Gigabit, Managed, Unmanaged)• SAN solutions (FC Switch, HBA)• Tape solutions (Tape Drive, Tape Autoloader, Tape library)• OS (MS, Red Hat, Suse)• Application (Altiris, MS SMS, VMware)• DB application• Back-up S/W • DPS (Dell Professional Service), 3rd party service

PowerEdgePowerEdge Server Roadmap Server Roadmap -- OverviewOverview

PowerEdge 8301 SOCKET

4 SOCKET PowerEdge 6800

PowerEdge 6850

PowerEdge 850

2 SOCKET

PowerEdge 2800

PowerEdge 2850

PowerEdge 1800

PowerEdge 1850

PowerEdge 1855

PowerEdge SC 430

PowerEdge SC 1425

PowerEdge SC 1420

End of LifeUpdateNew Product Introduction

PE 1955

PE 2900

PE 2950

PE 1900

PE 1950

SC 1435

SC 1430

MP Paxville

PE 840

PE 860

SC 440

800FSB, SAS Option External

SAS Option Internal

Woodcrest

SAS External

Q4 CY05 Q1 CY07Q4 CY06Q1 CY06 Q2 CY06 Q3 CY06Tulsa

Processor RoadmapProcessor RoadmapSi

ngle

Cor

eD

ual C

ore

Q4 CY05 Q1 CY07Q4 CY06Q1 CY06 Q2 CY06 Q3 CY06

EOLNew platform/chipsetNew processor introduction

4S

Blades

Low Voltage* 2S (Rack and Blades)

2S (SC and PE)

1S (SC and PE)Xeon 2MB (Irwindale) / 7520

Xeon LV 1MB 2.8Ghz (Nocona LV) / 7520

Xeon 1MB (Cranford), Xeon 8MB (Potomac) / 8500

Dual core Xeon (Paxville MP) / 8501

P4 600 sequence (Cedar Mill) / 7230

New Cedar Mill/Prescott sequence / Mukilteo-2

Xeon 2MB (Irwindale) / 7520

Mid /Low Voltage 2S PE and Blades

2S (SC1430)

1S (SC and PE)

Dual core (Dempsey) / 5000P (Blackford)

Dual core (Woodcrest) / 5000P (Blackford)

Conroe Family / Mukilteo-2

Dual core Xeon 16MB L3 (Tulsa) / 8501

Dual core (Woodcrest) / 5000V (Blackford-VS)

Dual core (Dempsey) / 5000X (Greencreek)

Dual core (Woodcrest) / 5000X (Greencreek)

** SC1435, SC1430 and PE1900 will launch with Woodcrest only (no Dempsey)

*** For PE only

PD 900 sequence (Presler) / 7230

Xeon LV 2MB 3.0Ghz (Irwindale LV) / 7520

4S

2S (Triathlon)

SC1435, PE1900 and Blades

MV Dempsey 3.2Ghz 1066 FSB Dual core (LV Woodcrest)

Dual core Xeon 2.8GHz** / 7230

PD 800 sequence (Smithfield) / 7230

Dual core Xeon 2.8GHz / 7230

P4 1MB, P4 2MB (Prescott) / 7230

PowerEdgePowerEdge 99thth GenerationGenerationFor Better Control of Your BusinessFor Better Control of Your Business

Continuing the success of Dell’s 8th Generation of PowerEdge Servers

신뢰성정밀한설계및제조, 테스트과정에충실한 Dell

관리기능- 강화된 공통기능

- Dell OpenManage™

- DRAC 5- IPMI 2.0- Program 가능한 LCD

성능- Intel® Xeon® Dual-Core - Fully Buffered DIMMs- PCI-Express I/O- Serial-Attached-SCSI- TCP/IP Offload Engine

완벽한 솔루션완벽한 기업용 제품을 위한

테스트 및 입증자료 제공

PowerEdge 9th Generation

BerlinPE1950

LondonPE2950

MontrealPE2900

PowerEdgePowerEdge 99thth GenerationGenerationFor Better Control of Your BusinessFor Better Control of Your Business

Consistent rack ID; Metal bezels; LCD visible; focus on fit/finish/refinement

PowerEdge 9th Generation

PowerEdgePowerEdge 99thth GenerationGenerationFor Better Control of Your BusinessFor Better Control of Your Business

London 3.5w/6 backplane

Berlin 3.5

Berlin 2.5

London 2.5

London 3.5w/4 backplane

Supported on the 2P rack servers

PowerEdge 9th Generation

PowerEdgePowerEdge 99thth G vs. G vs. PowerEdgePowerEdge 88thth

8 DIMMs on 9G (12 on PE2900); 고용량 DIMMs6 DIMMs –큰구성을위한고비용

DRAC은고정또는분리포트를지원할수있음; 더나은가상화실행

DRAC을위한옵션없이고정포트또는분리포트를가짐; 제한된가상화

Only PCI-X and PCIe5v PCI (몇몇타워형모델)

Broadcom Gb NICs w/ optional TOEIntel Gb NICs

듀얼 Core Processors단일 Core Processors

TBU w/ add-in controller; ROMB int. onlyInternal SCSI for TBU; ext SCSI on 2U/5U

ROMB on daughter cardROMB on riser

Fully Buffered DIMMs (FBD)DDR II

4 Port SAS std.; ROMB required for >4 HDsDual channel SCSI

프로세서 / 메모리

I/O Connectivity

저장변환

No PS/2 – USB only; No parallel portPS/2, 병렬 port (몇몇타워형모델)

SATA, hot-plug SATA 포함 (3.5”만가능)SATA 안됨

3.5” (블레이드를제회한전모델) 및 2.5” (1U/2U/블레이드)

3.5” HDs만가능

SAS (split backplane N/A)U320 SCSI (병렬); split backplane

9세대8세대

PowerEdge “9th Generation” vs “8th Generation”

Standard Edition One: Standard Edition One: TheThe Solution For SMBSolution For SMB

““현재현재 비지니스의비지니스의 요구요구””

• Oracle 가격: $745 for a 5 user license1

• Oracle 패키지구입 including server, software and support (storage sold separately)

• 최소의투입비용

• Starting at $2,863• Scalable to large clusters

““가까운가까운 미래의미래의 데이터센터데이터센터””

Source: http://oraclestore.oracle.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=114701

Source: www.dell.com/database as of 03/07/052

Think BigThink Big

Start small

CX500 SAN

Scalable Enterprise starts with GridScalable Enterprise starts with GridOracleOracle 1010gg Database and RACDatabase and RAC

PE6850 4xCPU

PE2850 1xCPU

PE2850 2xCPU

중소형 비지니스• 150 CC Users• .5TB Storage

SE-1

PE2850 2xCPU

RAC: 2 nodes

Entry LevelEasy as Dell: Installation CD, 배치 서비스, 원스탑 쇼핑 또는 One P.O.

Business Continuance: 높은 용이성

Dev/Lab System

중형 비지니스• 600 CC Users• 1-5TB Storage

Dev/Lab System

투자보호: Leverage common industry building blocks through outScalable IT: Pay as you grow…

Dep

artm

enta

l

CX700 SAN

RAC: 8 nodes

중대형 기업체• 2400 CC Users• 10TB Storage

Div

isio

nal

PE2850 2xCPU

AS: 96 nodes | RAC: 8 nodes

기업체 : HQ• 20K CC Users• 15TB Storage

Divisional HQ

Redundant Site

CX700 SAN

그리드그리드

Dell|Dell|OracleOracle GridGrid--ComputingComputing

기업기업 관리자관리자

®®

클러스트된클러스트된어플리케이션어플리케이션 서버서버

®®

클러스트된클러스트된

데이타베이스데이타베이스 서버서버

®®

Grid OnGrid On--Demand Performance: Demand Performance: 동적동적 자원자원 할당할당

AvailibilityAvailibility on demandon demand

Database utilizationDatabase utilization

프로덕션프로덕션서버서버풀풀

기업기업 관리자관리자

®®

클러스트된클러스트된어플리케이션어플리케이션 서버서버

®®

클러스트된클러스트된데이타베이스데이타베이스 서버서버

®®Scale as you growScale as you grow

작업량작업량 감지기가감지기가 능력을능력을 늘릴늘릴필요성을필요성을 탐지해탐지해 낸다낸다

새로운새로운 서버서버 노드가노드가 클러스트로클러스트로

된다된다

GridGrid의의 높은높은 이용편의성이용편의성최종최종 유저는유저는 Server FailureServer Failure를를 볼볼 수수 없다없다..

AvailibilityAvailibility on demandon demand 프로덕션프로덕션서버서버풀풀

클러스트된클러스트된데이타베이스데이타베이스 서버서버

®®

기업기업관리자관리자

®®

클러스트된클러스트된어플리케이션어플리케이션 서버서버

®®

다운시간다운시간 없다없다

최종최종 유저에겐유저에겐 투과성이투과성이 있다있다(failing(failing은은 남아있는남아있는 노드로노드로넘긴다넘긴다))새로운새로운 서버가서버가 클러스트로클러스트로 된다된다..

Grid Grid 동적동적 자원자원 재구성재구성::작업량작업량 균형을균형을 위한위한 재할당재할당

AvailibilityAvailibility on demandon demand 프로덕션프로덕션서버서버풀풀

클러스트된클러스트된데이타베이스데이타베이스 서버서버

®®

기업기업관리자관리자

®®

클러스트된클러스트된어플리케이션어플리케이션 서버서버

®®어플리케이션어플리케이션이용도이용도

Database utilizationDatabase utilization작업량의작업량의 균형균형

작업량작업량 모니터가모니터가 클러스터클러스터이용도의이용도의 불균형을불균형을 탐지해탐지해 낸다낸다

이용도가이용도가 떨어지는떨어지는 클러스터에서클러스터에서서버를서버를 제거하고제거하고 높은높은 작업량을작업량을갖는갖는 클러스터를클러스터를 추가한다추가한다

DellDell on Dellon Dell

PerformancePerformance

Dell Runs MissionDell Runs Mission--Critical Order System on Critical Order System on OracleOracle 1010gg

• 시스템의 전체 퍼포먼스 5배 향상

• 리얼타임 fault tolerance로 비즈니스 연속성 구현

• 자동화된 관리로 인해 사람이 할 수 있는 실수를 크게 감소시킨다

• 미래의 요구사항을 충족하기 위해서 기술은 그 영역을 확장해 나갈 것이다.

Moved from 52 CPUMoved from 52 CPU’’s in 2 RISC servers s in 2 RISC servers to six Dellto six Dell PowerEdgePowerEdge 44--waysways

1212개월개월 ROI ROI 평가평가= $1.749 million = $1.749 million 비용절감비용절감 효과효과

Source: Oracle sponsored ROI Study: Source: Oracle sponsored ROI Study: Dell Moves European Sales Operations to Oracle Enterprise Grid oDell Moves European Sales Operations to Oracle Enterprise Grid on Dell Systemsn Dell Systems Published by Mainstay Partners, Dec 2004 Published by Mainstay Partners, Dec 2004

Dell Consolidates Dell Consolidates on Oracle 10on Oracle 10gg Linux for GEDISLinux for GEDIS

The Proof is in The PerformanceThe Proof is in The Performance

Spee

d

77%faster

UNIX

Pric

e

49%less

UNIX

Dell 2-processor PowerEdge 2850/Windowsvs.

UNIX 4-processor server

Source: Based on testing by Dell in Nov. 2004 comparing similarly configured 4-P UNIX server with 1.28 GHz processors and 2-PPowerEdge 2850 server with 3.4 GHz processors. Dell expects server testing performance to vary with processor speed. Server prices obtained from companies’ respective websites as of 11/29/04.•

The Scalable EnterpriseThe Scalable Enterprise

주요벤더사는?• Sun, HP, IBM

고객이 선택하는 이유는?- Mission critical , Fault-tolerant

systems

어떤 고객들인가?- 4개의 CPU 이상의 프로세싱 파워를요구하는 고객들

The Enterprise Database The Enterprise Database 환경환경

Comparing Unix with LinuxComparing Unix with Linux

• Unix– 대규모 확장성– 입증된 가용성– 질적인 지원– 진보된 솔루션

• Linux– 제한된 확장성– 제한된 가용성– 제한된 지원– 진보되지않은 솔루션

So why would a customer migrate?

Can You Name These Servers?Can You Name These Servers?

ScaleScale--Up ComputingUp Computing

• What is the largest number of CPUs in a scale-up Unix server from HP, IBM or Sun?

– typically 64 cores. With dual-core technology that effectively means 128 CPUs now in most cases

• What is their value proposition?– Availability, scalability, reliability and flexibility

• How do they achieve scalability?– Through internal expansion that allow many CPUs to share access

to a common memory pool and that allow the machine to run a single operating system

• How do they achieve high availability?– Through internal redundancy

Can You Name These Servers?Can You Name These Servers?

• What is the largest number of CPUs in a scale-up Intel server from Dell?

- 4 CPUs. Dell doesn’t sell servers with more than 4 CPUs. That means a single Dell server cannot be an “enterprise solution” because it simply isn’t scalable enough.

• What is Dell’s key value proposition?- Low-cost, industry-standard, modular computing elements that de

liver a flexible, affordable, standard-based approach to enterprise computing.

• How does Dell achieve scalability?– Through external expansion that allow many servers to cooperate

together in a grid to support large workloads• How does Dell achieve high availability?

- Through external redundancy.

ScaleScale--Out ComputingOut Computing

Oracle Grid ComputingOracle Grid Computing

Grid ControlStorage

DatabasesApplication Servers

Computing on Demand Scaling OutComputing on Demand Scaling Out

• Expensive costly components• High incremental costs• Single point of failure• Enterprise service at high cost

• Low cost modular components• Low incremental costs• No single point of failure• Enterprise service at low cost

Large Dedicated Server Oracle Grid

Our Path to GridOur Path to Grid

• Standardize – Cost effective Dell servers – Intel Xeon & Itanium 2 processors– Tiered EMC Networked Storage

• Consolidate onto– Oracle 10g Databases with Real Application

Clusters and Automatic Storage Management– EMC Networked Storage

• Automate– Operation & management

• Lower cost industry standard technology now exists to meet or exceed the QoS, manageability, flexibility and performance previously offered only by expensive SMP solutions

• Project MegaGrid Objectives:– How do you design and deploy?– How do you monitor, analyze and tune for performance?– How do you scale?– How do you manage?

ProjectProject MegaGridMegaGrid

Our MethodologyOur Methodology

• Identify a real world enterprise workload– Cramer Systems, British Telecom workload– Cramer’s Voice / Data service provisioning software– Web-based application – CPU and I/O intensive

• Establish a baseline on SMP servers– 550,000 transactions / hour

• Jointly design and build an enterprise grid infrastructure– Clustered database, servers, networked storage

• Measure performance, scalability, and management while progressively scaling the infrastructure

– Scale up to terabytes of data

• Document best practices and quantify the advantages

Performance (Cramer 4 Benchmark)

Tran

sact

ions

per

Hou

r

550K 580K

1.07M

Value

E 15K PE 1750 PE 7250

Pric

e

$2.6M

$40K

$129K

E 15K PE 1750 PE 7250

ProjectProject MegaGridMegaGrid ResultsResults

Proving the Power of Standards & Scale-OutServerServer list pricing was obtained from dell.com and sun.com as oflist pricing was obtained from dell.com and sun.com as of December 3, 2004, and includes server hardware costs only.December 3, 2004, and includes server hardware costs only.

Cluster Cluster Cluster Cluster

ProjectProject MegaGridMegaGrid –– Phase II PlansPhase II Plans

• Enterprise Application Consolidation - Expand Applications workload to include Cramer, Oracle Application Server and OracleApplications

• Continued Scalability of The Grid - Continue to scale environment, adding additional nodes and storage to the Oracle 10g database cluster

• Business Continuance - Expand testing to focus on best practices for performing upgrade and patch management in large-scale clusters without disruption and protection against component failure in the Grid

• Backup to Disk – Test online backup to disk solutions leveraging ATA storage

• Workload management – Capture the procedures for provisioning resources to react to changes in workload demand – includes migration of data / storage from one system to another

• Document Additional Best Practices - Publish Best Practices for deployment, upgrade and management of business applications in large-scale clusters

How to Learn MoreHow to Learn More

• Websites– www.dell.com/megagrid– www.emc.com/megagrid– www.oracle.com/megagrid

• Content– Joint Best Practices and whitepapers– Frequently Asked Questions– News and Upcoming Events

One SourceOne Source

Tech Support

Pro Services

Oracle Licenses

9i AS/DB/RAC

Implementation

Hardware

Oracle

Partners

Hardware Vendors

Traditional Approach

Perception of ComplexityPerception of Complexity

Tech SupportTech Support

The SingleThe Single--Source EnterpriseSource Enterprise

TraditionalTraditional Dell|OracleDell|Oracle

ImplementationImplementation

Prof. ServicesProf. Services

1010gg AS/DB/RACAS/DB/RAC

Oracle LicencesOracle Licences

OSOS

HWHW

®®

PartnerPartner CustomerCustomer

PartnerPartner ®®

®®

PartnerPartner ®®

Red HatRed Hat

HW VendorHW Vendor

Red HatRed Hat

®®

®®

®®

®®

®®

Oracle Sizing Support & ServicesOracle Sizing Support & Services

DeploymentDeployment

ConsultativeConsultativeSizingSizing

Real Sizing Real Sizing and/or POCand/or POC

• Engage ETA (ISIS)• Engage DPS• Potential Site Survey• Potential SOW•• More AccurateMore Accurate

• Engage DPS/ISIS• Utilize POC Center• Onsite POC’s• Recreate Customer

Environment• Provide Baseline• SOW•• Extremely AccurateExtremely Accurate

InitialInitialSizingSizing

• SC or TSR• Engage sizing tools

and whitepapers• Utilize ET/FEM• Utilize ETA (ISIS)•• SWAG or EstimateSWAG or Estimate

AC

CU

RA

CY

COST

Q U E S T I O N SQ U E S T I O N SA N S W E R SA N S W E R S