We use EATON POWERWARE Eaton 9130i-3000R-XL2U. Yesterday there was a power problem and for 5 minutes whole our office building have got no power.
All our UPS didn't switch the power supply. After I told with the engineers I discover that all UPS in whole building didn't switch the power and as a result the servers that were connected to the UPS were restarted forcibly.
I wonder what is a reason of such behavior, could you suggest?