1. What is SLA Availability?

SLA (Service Level Agreement) Availability measures the percentage of time a service is operational and available for use. It's a key metric in IT service management and cloud computing to ensure service reliability meets agreed-upon targets.

2. How Does the Calculator Work?

The calculator uses the basic availability formula:

Where:

• \( Actual\ Uptime \) — Time the service was operational
• \( Total\ Time \) — Total time period being measured

Explanation: The formula calculates what percentage of the total time period the service was available.

3. Importance of SLA Monitoring

Details: Regular SLA monitoring ensures compliance with contractual obligations, helps identify service reliability issues, and maintains customer satisfaction. Common SLA targets are 99.9% ("three nines") or higher.

4. Using the Calculator

Tips: Enter actual uptime and total time in the same units (hours recommended). The SLA target is the minimum acceptable availability percentage (typically between 99-100%).

5. Frequently Asked Questions (FAQ)

Q1: What's considered good SLA availability?
A: 99.9% (three nines) is common for many services, while critical systems may require 99.99% (four nines) or higher.

Q2: How is downtime calculated?
A: Downtime = Total Time - Uptime. Planned maintenance may or may not be included depending on SLA terms.

Q3: What's the difference between availability and reliability?
A: Availability measures uptime percentage, while reliability focuses on frequency and duration of outages.

Q4: How do you calculate monthly downtime from SLA?
A: For a 99.9% SLA, maximum allowed downtime is 0.1% of the period (e.g., 43.2 minutes per month).

Q5: What factors affect SLA availability?
A: System redundancy, maintenance procedures, incident response times, and infrastructure quality all impact availability.