Database and Public EndPoints Redundancy on Azure (Radu Vunvulea)

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Database and Public

Endpoints redundancy on

@RaduVunvulea, iQuest

http://vunvulearadu.blogspot.com

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Cloud is not managed by God

• Define Redundancy

• SQL Database

• Storage

• Endpoints (HTTP/S, WCF)

• VM

Agenda

Redundancy

In engineering, redundancy is the duplication

of critical components or functions of a system

with the intention of increasing reliability of

the system, usually in the form of a backup or

fail-safe.

Source: Wikipedia

Redundancy

Hardware

Dual Modular Redundancy

Triple Modular Redundancy

Information

Error detection

Correction

Transient Fault Detection

Software

N-versions Programming

Type of Redundancy

Hardware

Information

Error detection

Correction

Software

Type of Redundancy

Hardware

Information

Error detection

Correction

Software

Type of Redundancy

Hardware

Information

Error detection

Correction

Software

Type of Redundancy

HOW WE CAN TEST IT?

Netflix: The Chaos Monkey’s job is to randomly

kill instances and services within our

architecture

Chaos Monkey

Failover & Switchover

SQL REDUDANCY

SQL Data Sync

Let’s see some code

SQL Backups

AlwaysOn

DISASTER RECOVERY PLAN

Do you have a disaster recovery plan?

How long it takes to restart the entire system?

How complicated is your checklist?

Can you parallelize it?

Disaster Recovery Plan (DRP)

Do you have a disaster recovery plan?

How long it takes to restart the entire system?

How complicated is your checklist?

Can you parallelize it?

AUTOMATION

Disaster Recovery Plan (DRP)

ENDPOINT REDUNDANCY

• Any public endpoint

• Accessible from internet or private networks

Endpoint

Load Balancer

• Free

• Out of the box

• Lever 3 Load Balancer type

– TCP Level

• No Sticky sessions

• Partial Configurable

Load Balancer

• Custom app endpoint

• Processor level, 500 Errors, Parallel task

• Configurable from *.cscfg files

• VM: Using Power Shell

Load Balancer Probe

<LoadBalancerProbes> <LoadBalancerProbe

name="FooProbe" protocol="http"

intervalInSeconds="30" path="/api/probe" port="80"

timeoutInSeconds="60" /> </LoadBalancerProbes>

Redundancy

Traffic Manager

• ~Load Balancer (Word Wide level)

• Redirect request based on client location

• Any kind of endpoint

– VM, Web/Worker Roles, DB and many more

– External Endpoints

• Methods: Failover, Round Robin, Performance

• Is not FREE (1B DNS query = $0.75)

• DNS TTL

Traffic Manager

• [Not Supported] Hybrid Scenarios

WHY REDUNDANCY IS SO

IMPORTANT?

• Compute 99.95%

• SQL Database 99.90%

• Storage 99.90%

• Storage (RA-GRS) 99.99%

• Active Directory 99.90%

• Cache 99.90%

• VM 99.95%

• Service Bus 99.95%

Windows Azure SLA’s

• Compute 99.95% 21.6m

• SQL Database 99.90% 43.2m

• Storage 99.90% 43.2m

• Storage (RA-GRS) 99.99% <8m

• Active Directory 99.90% 43.2m

• Cache 99.90% 43.2m

• VM 99.95% 21.6m

• Service Bus 99.95% 21.6m

Windows Azure SLA’s (per month)

• Compute 99.95% 21.6m

• Storage 99.90% 43.2m

• Cache 99.90% 43.2m

• VM 99.95% 21.6m

• Downtime per month: 216m

21.6*2+43.2*4=216m

• Downtime per month: 0.5%

(100/43200)*216=0.5%

21.6*2+43.2*4=216m

• Downtime per month: 0.5%

(100/43200)*216=0.5%

• Uptime: 99.5%

100-0.5=99.5%

• Compute 99.95% 21.6m

• Storage 99.90% 43.2m

• Cache 99.90% 43.2m

• VM 99.95% 21.6m

WCF ENDPOINTS REDUNDANCY

Service Bus Relay

• Steps to integrate in existing application

– Add assembly reference to SB Relay

– Update WCF configuration sections

(client and backend)

Service Bus Relay

• Works only with

– Async calls

– Fire and Forget calls

• Broker between endpoint and client

• Store messages until backend is available

• WCF Endpoint (Azure or on-premises)

• Price model similar with SB (per messages)

Service Bus Relay

STORAGE REDUNDANCY

• 3 copy of the content in the same data center

Locally Redundant Storage

• 2 different data centers

• Async replication

Geographically Redundant Storage

• Similar with GRS

• Read only access to the secondary storage

• Redirecting managed by developer

• Async replication

• 99.99% Uptime

Read Access Geo Redundant Storage

Traffic Manager

CHECK HEALTH STATUS OF

OTHER SERVICES

Traffic Manager

Import Export Service

Import/Export Service

MTBF, MTTR

Mean Time Between Failures

Mean Time To Recovery

MTBF -> MTTR

VM REDUNDANCY

• Same features offered by System Center on-

premises

• Availability Set

• Windows Server Failover Cluster

– Real time Sync

CONCLUSION

• Everything has a price

• Calculate up-time for specific roles and use-

• Don’t trust the 99.99% myth

• Be as flexible as possible

• Automate

• Recovery plans

Conclusion

Database and Public EndPoints Redundancy on Azure (Radu Vunvulea)

versions programming

disaster recovery

code premium

switchover

redundancy

premium conference

entire system

redundancy

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