Availability & the Nines: Allowed Downtime
All lessons
- Availability & the Nines: Allowed DowntimeFree
- MTBF, MTTR, MTTA & Availability Pro
- SLA Compliance from Ticket Timestamps Pro
- Ticket Backlog & First-Contact Resolution Pro
- Error Budgets & Burn Rate (SLO 99.9%) Pro
- Capacity Planning: Months Until the 80% Threshold Pro
- Change Success Rate & the Cost of Incidents Pro
- Service Desk Staffing: Agents Needed per Shift Pro
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The nines at a glance
- 99% ≈ 3.65 days per year, 7.2 hours per month
- 99.9% ≈ 8.76 hours per year, 43.2 minutes per month
- 99.99% ≈ 52.6 minutes per year, 4.3 minutes per month
- 99.999% ("five nines") ≈ 5.3 minutes per year
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