Thread

1. colonwqbang · 1790678244 · focus · HN ↗

   When you think about it, 24 years is not such a long time for a machine to keep doing what it's supposed to be doing. It says something about our profession that we find a 24-year service life surprising.

   There are airliners that have been in service for over 50 years.

   1. tyrabound · 1790684702 · focus · HN ↗

      You raised in my mind that we are looking at this all wrong, the server is not actually one component, it’s really a system of systems, and just like an airliner is a system of systems too, the conflict arises in that the comparison is at the wrong level.

      It seems when people think of a server today, they think of a single computer, if not some software server somewhere in the cloud. These subject kinds of servers are far closer to complex systems of separate components, more like a network system, it’s why components of what are really separate networked computers can and need to be replaced.

      An airliner is of course also made up of components that are also systems, however at least in my mind, the difference is the actual expected use case. An airliner is not a good comparison because it is never expected to remain in continuous operation, e.g., that at least one engine is always running even when it is being overhauled or repaired, to satisfy a requirement of continuous operation.

      1. pitched · 1790686318 · focus · HN ↗

         FTA, this is a fault-tolerant server where all hardware is redundant and can be hot swapped while running. The servers you’re thinking about are redundant at the software level so rebooting one server won’t cause the service to go down.

         What is remarkable is that apparently that VOS thing has never crashed. I wonder if they also do software redundancy under the hood to keep uptime going during reboots. If the CPU is hotswappable, it must have something.

         1. serf · 1790690240 · focus · HN ↗

            VOS is a parallel lockstep OS. You drop nodes and replace them to keep the whole operational.

Unofficial Hacker News client; not affiliated with Y Combinator.