Uptime Meter
The Uptime Meter(SM) measures the actual availability of supported Stratus systems worldwide. This meter is re-calculated daily, based on actual identified service incidents.
Uptime Calculation
Uptime of the Stratus ftServer family is computed and updated daily based on all identified service incidents of any duration for all supported ftServer systems worldwide, during the preceding 6-month period.
Both hardware-related and software-related incidents are included in this availability measurement. Outages due to customer activity such as testing, debugging, or planned service are not included.
Identified service incidents are those logged by our 24/7 proactive availability monitoring or reported by customers.
Definition of Uptime
"Uptime" or "Availability" is defined here as the fraction of a time period that a system is fully operational; for example, if a system is fully operational 100 hours per week, its availability is 100/168 = 60%.
Availability is normally expressed in 9's; for example, "five nines" means that a system is fully operational 99.999% of the time, corresponding to an average of less than 6 minutes downtime per year. The chart below shows what statistical impact various availability levels have on average downtime.
| Availability Level |
Average Yearly Downtime |
Conventional |
99% |
87 hours, 40 minutes |
High Availability |
99.9%
99.95% |
8 hours, 46 minutes
4 hours, 23 minutes |
Continuous Availability
The Stratus Zone |
99.99%
99.999%
99.9999% |
52 minutes, 36 seconds
5 minutes, 16 seconds
31.6 seconds |
Disclaimer: The Uptime Meter reflects a mathematical consolidation of all operational systems; however, the actual availability of any particular system may differ.