Database and Public EndPoints Redundancy on Azure (Radu Vunvulea)

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Database and Public
Endpoints redundancy on
Azure
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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

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)

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