This document discusses fault and upgrade domains for cloud workloads. It defines fault domains as isolated infrastructure components like physical hosts and network equipment so that failure of a single component cannot take down an entire service. It defines upgrade domains as logical groupings of role instances so that deployments can be upgraded one domain at a time with no availability impact through rolling upgrades. It also shows an example of a cloud application distributed across multiple regions with unique URLs for high availability and reliability.

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3. End Slide

8. Retail HQ
Manufacturing Project
Point of Sale
Industry Operational Workloads
HR
Finance
SRM
Expense HCM
Sales and
Distribution
Customer
Care
Citizen Portal
Sales Force
Automation
Marketing
Automation
Administrative
Core
Horizontal Operational
Workloads
CRM Workloads

23. Fault Domains
• Failed component can’t take down
service
• Isolated infrastructure
• Physical hosts, racks
• Network equipment
• Two by default
• Role instances across 2+ fault
domains
Upgrade
Domains
• VM rolling upgrades, no availability
impact
• Logical grouping of role instances
• Five by default
• Role instances spread over upgrade
domains
• Deployment upgraded for all or one at
a time

43. foo-us.cloudapp.net
foo-
europe.cloudapp.net
foo-asia.cloudapp.net