1. Availability Zones: Design Highly Available Applications on Azure
7/18/ :30 AM
BRK2086
Availability Zones: Design Highly Available Applications on Azure
Saad Ladki
Program Management
Azure Resiliency and Regions
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2. Session objectives and takeaways
7/18/ :30 AM
Session objectives and takeaways
At the end of this session, you should be able to
Have an understanding of the Azure Resiliency strategy and mechanism
Understand what Availability Zones are and how to use them
Design highly available apps with Availability Zones and upcoming functionality
© Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

3. Azure Resiliency Today From mission critical applications to backup
7/18/ :30 AM
Azure Resiliency Today From mission critical applications to backup
Data residency boundary
Data residency boundary
Region 1
Region 2
Region 1
Region 2
High availability
High Availability using Availability Sets for protection from hardware failures in a datacenter.
Disaster recovery
Replication from one region to another, with standby VMs in the other region. Azure offers protection between regions within data residency boundaries.
Backup
Data is asynchronously replicated and stored for redundancy purposes with data residency options.
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4. Most Comprehensive Resiliency and Best SLA
7/18/ :30 AM
Most Comprehensive Resiliency and Best SLA
INDUSTRY-LEADING HIGH AVAILABILITY SLA
INDUSTRY-LEADING DISASTER RECOVERY
INDUSTRY-ONLY
VM SLA
99.9%
VM SLA
99.95%
VM SLA
99.99% at GA
REGIONS 42
Region 1
Region 2
SINGLE VM
Protection with Premium Storage
AVAILABILITY SETS
Protection against failures within datacenters
AVAILABILITY ZONES
Protection from entire datacenter failures
REGION PAIRS
Protection from disaster with Data Residency compliance
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5. Introducing Availability Zones
7/18/ :30 AM
Introducing Availability Zones
Available as a preview in East US 2 and West Europe
Supported resources include:
Virtual Machines & Scale Sets backed by 99.99% SLA at GA
Managed Disks
Public and internal IP (Standard and Basic SKUs)
Public and internal Load Balancers (Standard and Basic SKUs)
More regions and services coming soon
© Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

6. Demo 1 Deploy VM in an AZ using the Azure Portal 7/18/2018 12:30 AM
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7. Availability Zones Deep Dive
7/18/ :30 AM
Availability Zones Deep Dive
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8. Geography—Data Residency boundary
7/18/ :30 AM
Availability Zones
Part of Azure’s native HA/DR solutions, providing protection from datacenter failure b
Geography—Data Residency boundary
Region
Region
Region 1
Region 2
Zone 1
Zone 2
Zone 3
Zone 1
Zone 2
Zone 3
Achieve full resiliency with Data Residency
Availability Zones and a paired region within the same data residency boundary provides high availability, disaster recovery, and backup.
Protect against entire datacenter loss
Each zone is physically separated with independent power, network, and cooling and logically separated through zone- isolated services.
Run mission-critical apps with 99.99% SLA at GA
High Availability supported with industry best SLA when VMs are running in two or more Availability Zones in the same region.
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9. Region Topology France Central
7/18/ :30 AM
Region Topology
Fault-isolated locations within an Azure region
Independent power, network, and cooling
Protection against physical and logical failures
France Central
© Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

10. Protection Through Redundancy
7/18/ :30 AM
Protection Through Redundancy
Minimum of three physically separated locations
Three zones to support Quorum based workloads like SQL, Service Fabric, Cassandra, MongoDb.
Independent power, cooling, network
A facility level failure or single fiber path failure will affect only a single AZ.
Azure management services replicated across zones
The management services are redundant and single zone failure will not affect availability. Updates orchestrated zone-by-zone.
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11. Zone-aware Services Zonal Services - Customer pin to AZs
7/18/ :30 AM
Zone-aware Services
Zonal Services - Customer pin to AZs
VMs
VM Scale Sets
Managed disks
VIPs
Zone Redundant Services replicate across 3 AZs
SQL DB
Cosmos DB
Web Apps
Application Gateway
…and more
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12. Announcing: Load Balancer Standard
7/18/ :30 AM
Announcing: Load Balancer Standard
PREVIEW
Zone-redundant data path
Availability Zones
Cross-zone load balancing
Zone-redundant data paths
Single IP address
Up to 1000 instances in backend pool
(includes 1000 instance VMSS)
HA Ports
Balance and scale virtual appliances, and more
New Monitoring and Diagnostics
Load Balancer Standard
Zonal VM
Zonal VM
Zonal VM
AZ1
AZ2
AZ3
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13. Announcing: Cross-zone VM Scale Sets
Load Balancer Standard
VNet
VM scale set
Zone 1
Zone 2
Zone 3
VM Scale Set (coming soon)
Single-zone Scale Sets – Available today
Create a scale set in a specific zone
Connect 3 scale sets to a LB Standard for zone redundancy
Cross-zone Scale Sets – Coming soon
Create a scale set spanning multiple zones
Scale Set automatically distributes VMs across zones
Connect scale set to a Standard LB for zone redundancy
Join the queue for early access at

14. Zone Redundant Data Services | Coming soon
7/18/ :30 AM
Zone Redundant Data Services | Coming soon
Zone Redundant Storage
Automatically writes data across 3 AZs
Highly available read/write across Availability Zones
Support for Blob, Table, File, Queue Storage
Azure SQL Database
Automatically deploys primary and 2 replicas across 3 AZs
Automatic failover with no data loss in case of an AZ failure
Zone-redundant database backups
End point
End point
Zone 1
Zone 2
Zone 3
Your data
Your data
Your data
Zone 1
Zone 2
Zone 3
Replica
Primary
Replica
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15. Demo 2 Horizontally-scalable web app across 3 AZ 7/18/2018 12:30 AM
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16. AZ developer experience
7/18/ :30 AM
AZ developer experience
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17. Availability Zones experience for HA
7/18/ :30 AM
Availability Zones experience for HA
Availability Zones are supported through the Azure Resource Manager deployment model
Virtual machines in an AZ must be connected to managed disks in the same AZ
You can use basic and standard public IP and load balancers with virtual machines in an AZ
A basic public IP must be in the same AZ as its VM
Subnets can span across Availability Zones
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18. ARM template – Zonal VM Add the Compute Resource:{
"apiVersion": " ",
"type": "Microsoft.Compute/virtualMachines",
"name": "[variables('vmName')]",
"location": "[resourceGroup().location]",
"zones": ["1"],
"dependsOn": [
... ],
"properties": {
"hardwareProfile": {
"vmSize": "[parameters('vmSize')]" },
"osProfile": { }
Add the Managed Disk Resource: {
"apiVersion": " ",
"type": "Microsoft.Compute/disks",
"name": "myManagedDataDisk",
"location": "[resourceGroup().location]",
"zones": ["1"],
"properties":
"creationData":
"createOption": "Empty" },
"accountType :"[parameters('storageAccountType')]",
"diskSizeGB": 64 }
Add the VIP Resource: {
"apiVersion": " ",
"type": "Microsoft.Network/publicIPAddresses",
"name": "[variables('publicIPAddressName')]",
"location": "[resourceGroup().location]",
"sku": {
"name": "Standard" },
"properties": {
"publicIPAllocationMethod": “Dynamic",
"dnsSettings": {
"domainNameLabel": "[parameters('dnsLabelPrefix')]" }

19. ARM template – Cross-zone VMSS and LB
Add the Compute Resource: {
"apiVersion": " ",
"type": "Microsoft.Compute/virtualMachineScaleSets",
"name": "[parameters('vmssName')]",
"zones" : ["1","2","3"],
"location": "[resourceGroup().location]",
"dependsOn": [
... ],
"sku": { },
"properties": { }
Add the VIP Resource: {
"apiVersion": " “,
"type":"Microsoft.Network/publicIPAddresses",
"name": "[variables('publicIPAddressName')]",
"location": "[resourceGroup().location]",
"sku": {
"name": "Standard" },
"properties": {
... }
Add the LB Resource: {
"apiVersion": " ",
"type": "Microsoft.Network/loadBalancers",
"name": "[variables('loadBalancerName')]",
"location": "[resourceGroup().location]",
"sku": {
"name": "Standard" }, }

20. Reference architecture
7/18/ :30 AM
Reference architecture
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21. Reference Architecture : Web App with AZs
7/18/ :30 AM
Reference Architecture : Web App with AZs
Web frontend across 3 AZs
Load balanced across VIPs using Standard Load Balancer
Data layer redundant across 3 AZs
SQL on IaaS
SQL Azure or CosmosDB
NoSQL (Cassandra, MongoDB)
Zone 1
Web App
SQL
Front End Subnet
Zone 2
Zone 3
DB Subnet
VNet
Load Balancer Standard
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22. Demo 3 Zone down scenario 7/18/2018 12:30 AM
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23. Review Session objectives and takeaways
7/18/ :30 AM
Review Session objectives and takeaways
You should be able to…
Explain the Azure Resiliency strategy and mechanisms
Explain what Availability Zones are and how to use them
Design highly available apps with Availability Zones and upcoming functionality
Takeaways
Azure provides a complete set of resiliency mechanisms to meet the most demanding requirements
Availability Zones provide an additional resiliency mechanisms with higher SLA
Availability Zones augment the existing Azure experience and you can leverage them with minimal changes
Keep an eye out for Availability Zones in more regions and services coming soon
© Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

24. Useful Resources Try Availability Zones today: https://aka.ms/az
Join the queue for early access to the cross-zone VM Scale Sets:
Search for ‘zones’ in the GitHub Azure Quick Start:
Learn more about VM Scale Sets:
BRK Microsoft Azure virtual machine infrastructure innovation and Wednesday 12:30-1:45pm
Learn more about Networking & Load Balancing: BRK Building highly available, secure and scalable services for the enterprise with Azure Thursday 2:15-3:30pm BRK High Performance data center expansion with Azure Thursday 9:00-11:15AM

25. Q & A

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7/18/2018
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