On 7/25/19 9:39 PM, John Pierce wrote: > On Thu, Jul 25, 2019 at 10:32 AM hw <hw at gc-24.de> wrote: > >> I can't help it when the primary name server goes down because the UPS >> fails >> the self test and tells the server it has 2 minutes or so left in wich case >> the server figures it needs to shut down. I wanted better UPSs ... >> > > critical infrastructure servers should have redudant PSUs, on seperate UPSs. right, with hot swappable batteries ... > my last rack builds, I had 2 Eaton PowerWare 7KVA 4U UPS's in the bottom of > each rack. one fed the left side PDUs, the other fed the right side PDUs, > and each server had redundant PSU's, one plugged into each PDU. > > those Eaton UPS's had hotswappable batteries, too. ... like this