I have a DL380 Gen9 server, and I would like to get a UPS for it so that when power outage happens, the server will be up at least for a minute. The server has two PSU, each 500W. I actually got a UPS (1500VA, power factor 0.6), but it could not keep server up when power outage happened. Server shut down immediately. Shouldn't 1500VA be fine for 500W server? I am confused. What is that I am missing to consider? By the way, I run 6 VMs on server as my virtual lab.
Your help would really be appreciated. Thanks.