Masahiko Uchiyama

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There are some computing systems that require high availability. Telecommunication systems are a good example. They require 24 hours a day and 365 days a year service availability and their downtime should not exceed five minutes per year and that includes hardware and software upgrades. These systems require carrier-grade reliability that guarantees high service availability, 99.999% uptime or higher. To satisfy high-availability requirements, special-purpose operating systems, sometimes proprietary or self-developed operating system, were used in telecom systems. As the telecommunication world is now moving towards using the Linux operating system on mission-critical systems, new high requirements are imposed on the operating systems. However, Linux is designed to work best on desktop and enterprise systems, and it doesn't have the mechanisms and capabilities nee... (more)