Database and Public EndPoints Redundancy on Azure (Radu Vunvulea)

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Database and Public

Endpoints redundancy on

Azure

@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

Time

Transient Fault Detection

Software

N-versions Programming

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


DEMO

Let’s see some code


SQL Backups


DEMO



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


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


DEMO



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




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

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

1

3

2


• 2 different data centers

• Async replication

Geographically Redundant Storage

1

3

2

1

3

2


• Similar with GRS

• Read only access to the secondary storage

• Redirecting managed by developer

• Async replication

• 99.99% Uptime

Read Access Geo Redundant Storage


DEMO



Traffic Manager


CHECK HEALTH STATUS OF

OTHER SERVICES

Traffic Manager


Import Export Service


Import/Export Service


DEMO



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

VM


CONCLUSION


• Everything has a price

• Calculate up-time for specific roles and use-

case

• Don’t trust the 99.99% myth

• Be as flexible as possible

• Automate

• Recovery plans

Conclusion


Q & A

Database and Public EndPoints Redundancy on Azure (Radu Vunvulea)

Technology

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