search for: 7kva

...plugged into (there's actually 4 UPS, 2 per each of 2 racks). Has anyone ever configured anything like that with NUT or whatever? Right now, I'm running without any UPS monitoring software, as the whole building is on a generator that comes on 60 seconds after a power failure, so my 7kVA(!) UPS's don't see much use, and also I just installled these new racks and UPS's and haven't really had the time to sit down and figure it all out. -- john r pierce 37N 122W somewhere on the middle of the left coast

On 7/25/19 4:07 PM, Giles Coochey wrote: > > On 25/07/2019 13:51, hw wrote: >> Hi, >> >> how can DNS reliability, as experienced by clients on the LAN who are >> sending queries, be increased? >> >> Would I have to set up some sort of cluster consisting of several >> servers all providing DNS services which is reachable under a single >> IP

On 7/4/2015 1:07 PM, John R Pierce wrote: > On 7/4/2015 12:28 AM, Jatin Davey wrote: >>> >> My server supports ACPI 4.0 standard , Will that be helpful ? > > does `init 0` as a root command cause it to gracefully shut down and > power off ? thats all the ACPI support you need. [Jatin] Yes, init 0 does gracefully shutdown the server and power off. > > >

...every one I've ever seen has been external... the mains power cable(s) for the server are plugged into the UPS. The UPS communications can be over ethernet, or USB, or serial signaling cable, depending on what sort of UPS. for an example, in my lab, each of my two racks has a pair of 7KVA UPS's in the bottom of the rack. these UPS's also have network cards, and are plugged into my management LAN. for my servers to talk to these UPS's, I need to know the IP address that the UPS is configured for. -- john r pierce, recycling bits in santa cruz

...ever > seen has been external... the mains power cable(s) for the server are > plugged into the UPS. The UPS communications can be over ethernet, > or USB, or serial signaling cable, depending on what sort of UPS. > for an example, in my lab, each of my two racks has a pair of 7KVA > UPS's in the bottom of the rack. these UPS's also have network cards, > and are plugged into my management LAN. for my servers to talk to > these UPS's, I need to know the IP address that the UPS is configured > for. > > > No , i was referring to the batter...

...e 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. 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. -- -john r pierce recycling used bits in santa cruz