What’s the startup peak draw of those severs? Have you measured it? Remember everything turns on at once after an outage.

In any case, even at your optimistic 250W per rack unit, a full rack of servers with two switches is more than 10kW!

Absolutely, I'm with you. I just meant that 900w isn't where "real servers" start. If you're at the point where you're experiencing issues with scalable power on you could disable that feature and script ipmitool to power the servers on once ipmi is reachable but in a queue. Could help you eek out a bit more density.

You could possibly run this fictional daemon on your management switch :)

My 900W per server number comes from experience with “hyper-converged” infrastructure where each 2U node has two filled CPU sockets, gobs of RDIMMs, and is stuffed with flash-based storage.

I think this is the most common “enterprise” datacenter server type in 2021, mostly due to licensing constraints from VMware/Microsoft/Red Hat/Oracle/etc. Such servers give the most “bang” per dollar when licensing costs are included.

We're running VMware with vSAN on 1u nodes with 2x Xeon Gold 8 core cpus @ 3.6ghz base, something about the Microsoft SPLA licensing as we're mainly virtualizing Windows machines. 384 GB RAM per node, and we're just pulling about 400.

https://i.imgur.com/Zr5rq4X.png a graph if you're curious :)