Database and Public EndPoints Redundancy on Azure (Radu Vunvulea)

Premium conference on Microsoft technologies itcampro@ itcamp14#
Database and Public
Endpoints redundancy on
Azure
@RaduVunvulea, iQuest
http://vunvulearadu.blogspot.com

Hello ITCamp!
RADU
VUNVULEA
MCTS MCP HOME AUTOMATION
MVP ENTERPRISE
AUTOMOTIVE PHARMA
LEAN AND AGILE E-COMMERCE
WEB iQuest
AZURE JAVASCRIPT VUNVULEARADU.BLOGSPOT.COM
MOBILE DOTNET @RaduVunvulea
WCF WPF ENTHUSIASTIC

Huge thanks to our sponsors & partners!

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

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>

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

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
• 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

• 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%

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

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
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)

Empfohlen

Empfohlen

Weitere ähnliche Inhalte

Was ist angesagt?

Was ist angesagt? (20)

Ähnlich wie Database and Public EndPoints Redundancy on Azure (Radu Vunvulea)

Ähnlich wie Database and Public EndPoints Redundancy on Azure (Radu Vunvulea) (20)

Mehr von ITCamp

Mehr von ITCamp (20)

Kürzlich hochgeladen

Kürzlich hochgeladen (20)

Database and Public EndPoints Redundancy on Azure (Radu Vunvulea)