Azure SLAs, Service Lifecycle, and Support Plans
Key Takeaways
- Azure SLAs define guaranteed uptime percentages (e.g., 99.9%, 99.95%, 99.99%) for each service with financial credits for breaches.
- Composite SLAs are calculated by multiplying individual service SLAs, resulting in a LOWER overall availability.
- Azure services go through Preview (Public/Private) before becoming Generally Available (GA) with full SLA and support.
- Azure Support Plans range from Basic (free) to Unified (premium) with varying response times and support scope.
- Azure updates and retirements are communicated through Azure Updates (blog) and Service Health advisories.
Azure SLAs, Service Lifecycle, and Support Plans
Quick Answer: SLAs guarantee uptime (99.9% = ~43 min downtime/month). Composite SLAs = multiply individual SLAs (always lower). Services go from Preview (no SLA) to GA (full SLA). Support plans range from Basic (free) to Unified (enterprise).
Azure Service Level Agreements (SLAs)
An SLA is a formal agreement between Microsoft and the customer that defines the minimum performance standards for an Azure service.
Understanding SLA Percentages
| SLA | Monthly Uptime | Max Monthly Downtime |
|---|---|---|
| 99% | ~30 days, 4 hours | ~7.2 hours |
| 99.9% | ~30 days, 7 hours | ~43.8 minutes |
| 99.95% | ~30 days, 7 hours | ~21.9 minutes |
| 99.99% | ~30 days, 7 hours | ~4.3 minutes |
| 99.999% | ~30 days, 7 hours | ~26 seconds |
Factors That INCREASE SLA
| Strategy | Effect |
|---|---|
| Deploy across Availability Zones | Improves from 99.9% to 99.99% for VMs |
| Add redundancy | If one path fails, the other takes over |
| Use managed services | PaaS services often have higher SLAs than IaaS |
| Multi-region deployment | Survive entire region failures |
Factors That DECREASE Composite SLA
When multiple services are required for an application, the composite SLA is calculated by multiplying:
Example: Web App (99.95%) → SQL Database (99.99%) → Storage (99.9%)
- Composite SLA = 99.95% × 99.99% × 99.9% = 99.84%
Each additional dependent service REDUCES the composite SLA.
Improving Composite SLA
Add redundancy for critical components. For example, if the SQL Database is the bottleneck, deploy a second database with failover:
- SQL with failover: 1 - (1 - 0.9999)^2 = 99.99999%
- New composite: 99.95% × 99.99999% × 99.9% = 99.85% (improved)
SLA Financial Credits
If Azure fails to meet the SLA, customers can claim financial credits:
| Monthly Uptime | Service Credit |
|---|---|
| < 99.9% but ≥ 99% | 25% credit |
| < 99% but ≥ 95% | 50% credit |
| < 95% | 100% credit |
On the Exam: SLA credits are financial credits applied to your NEXT billing cycle — they are NOT full refunds. You must file a claim to receive credits.
Azure Service Lifecycle
Azure services go through a defined lifecycle:
1. Private Preview
- Available to select customers by invitation
- Used for early testing and feedback
- No SLA, not recommended for production
- May change significantly before GA
2. Public Preview
- Available to all Azure customers
- Can be enabled in the Azure portal
- No SLA, may have reduced pricing or be free
- Not recommended for production workloads
- Features may change before GA
3. General Availability (GA)
- Fully supported with SLA, documentation, and support
- Suitable for production workloads
- Standard Azure pricing applies
- Subject to Microsoft's support policies
On the Exam: Preview services do NOT have SLAs and should NOT be used for production workloads. Only Generally Available (GA) services have SLAs and full support.
Azure Support Plans
| Plan | Cost | Technical Support | Response Time (Critical) |
|---|---|---|---|
| Basic | Free | No technical support (billing and subscription only) | N/A |
| Developer | ~$29/month | Business hours email support | 8 hours |
| Standard | ~$100/month | 24/7 phone and email for critical issues | 1 hour |
| Professional Direct | ~$1,000/month | 24/7 phone, email + advisory services + ProDirect delivery managers | 1 hour + escalation |
| Unified (Premier) | Custom pricing | Dedicated support team, technical account manager, on-site support | 15 minutes + dedicated team |
What is Included in ALL Plans
- Azure documentation and self-help resources
- Azure community support (forums)
- Azure Advisor recommendations
- Azure Service Health notifications
- Billing and subscription support
Staying Informed About Azure Updates
| Resource | What It Provides |
|---|---|
| Azure Updates (azure.microsoft.com/updates) | Blog of new features, service updates, and retirements |
| Azure Service Health | Personalized alerts for issues affecting your resources |
| Azure Preview features | Try upcoming features before GA |
| Microsoft Learn Blog | Training and certification updates |
| Azure Friday | Weekly video series about Azure features |
If three dependent services each have a 99.9% SLA, what is the composite SLA?
Which Azure service lifecycle phase has full SLA support and is suitable for production?
Which Azure support plan is the cheapest option that provides 24/7 phone support for critical issues?
What happens if Azure fails to meet the SLA for a service?
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