IT Professionals

David Tesar | Microsoft Technical EvangelistDavid Aiken | Microsoft Group Technical Product Manager

07 | High Availability and Load Balancing

Agenda• Windows Azure VMs• Getting Started with

VMs• Managing VMs• Managing VMs with

PowerShell• Understanding Linux

VMs

Service Level Agreements

What’s includedCompute Hardware failure (disk, cpu, memory)Datacenter failures - Network failure, power failureHardware upgrades, Software maintenance – Host OS UpdatesWhat is not includedVM Container crashes, Guest OS Updates

99.95% for multiple role instances4.38 hours of downtime per year

Server 2

SLA 99.95

Availability set

Server 1

Fault and Update DomainsFault Domains•Represent groups of resources anticipated to fail together•i.e. Same rack, same server•Fabric spreads instances across fault at least 2 fault domains

Update Domains•Represents groups of resources that will be updated together•Host OS updates honour service update domains•Specified in service definition•Default of 5 (up to 20)

Fabric spreads role instances across Update Domains and Fault Domains

Fault Domain

Rack

Fault and Update DomainsFault Domain

Rack

INSTANCE

INSTANCE

INSTANCE

INSTANCE

INSTANCE

INSTANCE

INSTANCE

INSTANCE

UD #1

UD #1

UD #2

UD #2

Virtual Machine Availability SetsUpdate Domains are honored by host OS updates

Fault DomainRack

Fault DomainRack

IIS1

SQL1

IIS2

SQL2

UD #2

UD #2

UD #1

UD #1

SQL Server2

SQL Server1

End to End Highly Available SolutionRedundancy at every level

IIS Web Application

Web Role

IIS Web Application

Web Role

LB

SQ

L M

irro

ring

Internet

SQL-AVSET

IIS-AVSET

Demo

Configuring Load Balancing and High Availability