4 ms·
Why the elevation constraint? "The elevation of the room where the rack is installed must be below 10,005 feet (3,050 meters)."
by jmartrican 5y ago
Why the elevation constraint?
"The elevation of the room where the rack is installed must be below 10,005 feet (3,050 meters)."
- ptomato 5y agoprobably air density cooling solution is qualified for.
- mikey_p 5y agoPerhaps a constraint on cooling effectiveness due to air density?
- dralley 5y agoAt 10,000 the air pressure is 1/3 less than at sea level, less density means less capacity for carrying heat, so the cooling might not be sufficient.
- notacoward 5y agoBingo. I've personally had to deal with this in other high-density systems. Less cooling not only has the obvious effects, but also reduces PS efficiency which can cause other problems. Cosmic-ray-induced memory errors can also be a problem at those altitudes (or even half that). That's a bit easier to deal with in principle, but the rate of ECC scrubbing required can start to impact performance. Stack that on top of thermal CPU throttling, and you'll have a system that's just slower than it should be. Just as importantly, the slowdown will be uneven across components, so it's effectively a different kind of system when you're debugging low-level issues. I think it's a good sign that they're aware of the additional support issues associated with higher altitude. Shows that they've really thought things through.