"Stratus ztC Endurance®

Stratus ztC Endurance extends fault tolerance to modern enterprise and operational environments with intelligent, predictive technology that prevents failures before they impact operations. Delivering up to *99.99999%* [my emphasis] availability, the platform combines proactive health monitoring, automated failover, redundancy, and simplified serviceability to keep applications continuously available and ensures that data stays protected.

Stratus ztC Endurance is ideal for organizations running mission-critical workloads that cannot tolerate downtime or data loss."

Source: https://www.penguinsolutions.com/en-us/solutions/fault-toler...

That's 3.15 seconds of downtime a year, or about 104 seconds since 1993. Quite impressive for a steel products maker.