Paolo Alexis Falcone wrote:
dumb UPS's also operate similar to this mode.
i agree but there are UPS that can't handle the power hog of servers and thus data centers use a much higher-capacity UPS that can serve hundreds of workstations or dozens of servers. and with this setup, we can't simply turn-off the UPS for STONITH purposes since it would shutdown all the machines connected to it thus, a PDU is preferred.
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