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Tech Tips, Tricks & Trivia

by 'Anil' Radhakrishna
An architect's notes, experiments, discoveries and annotated bookmarks.

Search from over a hundred HOW TO articles, Tips and Tricks

Compared: The "Nines" of uptime, Azure Services SLA

Availability is basically the same as uptime. It’s often measured by “Nines”. Availability specified as a number of nines is often seen in marketing documents. The table below lists the downtime that the nines translate to -

Nines Downtime
99% Daily: 14m 24.0s
Weekly: 1h 40m 48.0s
Monthly: 7h 18m 17.5s
Yearly: 3d 15h 39m 29.5s
99.9% Daily: 1m 26.4s
Weekly: 10m 4.8s
Monthly: 43m 49.7s
Yearly: 8h 45m 57.0s
99.95% Daily: 43.2s
Weekly: 5m 2.4s
Monthly: 21m 54.9s 
Yearly: 4h 22m 58.5s
99.99% Daily: 8.6s
Weekly: 1m 0.5s
Monthly: 4m 23.0s
Yearly: 52m 35.7s
99.999% Daily: 0.9s
Weekly: 6.0s
Monthly: 26.3s
Yearly: 5m 15.6s

Service Level Agreement (SLA) summary for Azure services (info as of September 2016; refer to the link for updates)

Azure Service SLA
Azure DNS valid DNS requests will receive a response from at least one Azure DNS name server at least 99.99% of the time
Traffic Manager DNS queries will receive a valid response from at least one Azure Traffic Manager name server clusters at least 99.99% of the time
Storage 99.99% (99.9% for Cool Access Tier) of the time, Microsoft will successfully process requests to read data from Read Access-Geo Redundant Storage (RA-GRS) Accounts, provided that failed attempts to read data from the primary region are retried on the secondary region. At least 99.9% (99% for Cool Access Tier) of the time, Microsoft will successfully process requests to read and write data from Locally Redundant Storage (LRS), Zone Redundant Storage (ZRS), and Geo Redundant Storage (GRS) Accounts.
SQL Database - Basic, Standard, and Premium Tiers at least 99.99% of the time customers will have connectivity between their single or elastic Basic, Standard, or Premium Microsoft Azure SQL Database and Microsoft's Internet gateway
SAP HANA on Azure Large Instances For SAP HANA on Azure that have been configured in a High Availability Pair, Microsoft guarantees connectivity to at least one instance at least 99.99% of the time.
DocumentDB at least 99.99% of the time Microsoft will successfully process requests to perform operations against DocumentDB Resources.
API Management Service instances running in the Premium tier 99.95%. API Management Service instances running in the Standard tier will respond to requests to perform operations at least 99.9% of the time.
App Service 99.95%. No SLA is provided for Apps under either the Free or Shared tiers.
Cloud Services & Virtual Machines that have two or more instances deployed in the same Availability Set 99.95%. For any Single Instance Virtual Machine using premium storage for all disks, we guarantee you will have Virtual Machine Connectivity of at least 99.9%.
ExpressRoute 99.95%
Function Apps running on App Service Plans 99.95%
VPN Gateway 99.95% availability for each Standard Gateway for VPN or Standard Gateway for ExpressRoute & High Performance Gateway for VPN or High Performance Gateway for ExpressRoute. 99.9% availability for each Basic Gateway for VPN or Basic Gateway for ExpressRoute.
Media Services 99.9% for Media Services Encoding, Streaming, Live Channels, Content Protection, Indexer
Mobile Engagement 99.9%
Mobile Services 99.9% availability of REST API calls to all provisioned Azure Mobile Services running in Standard and Premium tiers in a customer subscription. No SLA is provided for the Free tier of Mobile Services.
Multi-Factor Authentication 99.9%
Power BI Embedded 99.9%
Scheduler 99.9%
Search 99.9%
Security Center 99.9%
Service Bus 99.9%
SQL Data Warehouse 99.9%
SQL Stretch Database 99.9%
StorSimple 99.9%
Stream Analytics 99.9%
Visual Studio Team Services 99.9%
Azure Active Directory 99.9% availability of the Azure Active Directory Basic and Premium services, Azure Active Directory B2C service, Azure Active Directory Domain Services
Application Gateway each Application Gateway Cloud Service having two or more medium or larger instances will be available at least 99.9% of the time.
Application Insights data latency of the Application Insights Service will not exceed two hours 99.9% of the time.
Automation 99.9%
Azure Backup service 99.9%
BizTalk Services 99.9%
Cache 99.9%
Cognitive Services Cognitive Services running in the Standard tier will be available at least 99.9% of the time
CDN 99.9%
Data Catalog 99.9%
Data Lake Analytics 99.9%
Data Lake Store 99.9%
Event Hubs 99.9%
HockeyApp 99.9%
HDInsight 99.9%
IoT Hub 99.9%
Key Vault 99.9%
Log Analytics 99.9%
Logic Apps 99.9%
Azure Monitor 99.9%
Site Recovery 99.9%

Virtual Machine Scale Sets, Service Fabric, Azure DevTest Labs are free services, therefore, they do not have a financially backed SLA.


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