99% uptime — two nines.
99% uptime means your service can be down for over three and a half days per year. That's roughly 14 minutes per day. For an internal tool or a non-critical service, this might be acceptable. For anything customer-facing, it's not.
Maximum allowed downtime
Per day
14m 24s
Per week
1h 40m 48s
Per month
7h 18m
Per year
3d 15h 36m
WHO NEEDS IT
Who targets 99%
Internal dashboards, development environments, staging servers, batch processing systems that can tolerate delays. Services where occasional downtime is inconvenient but not damaging.
WHAT IT TAKES
How to achieve two nines
Basic monitoring and a deployment process that doesn't regularly break things. No redundancy required. A single server with reasonable uptime and manual recovery is enough.
Other uptime tiers
Measure your actual uptime.
Larm uses multi-probe voting to verify outages before alerting — so false positives don't eat into your uptime budget.