Do dual-power supply servers increase redundancy?
Power, a basic element in every data center, is sometimes taken for granted by server administrators. Furthermore, power loss or poor power quality is a major contributor to data center server down time. I am not referring to a major utility power failure, just to a common pitfall of power distribution system practice and management. There are several basic, but key, power components in the data center: • utility power source(s) and main power panel(s), • back-up generator and automatic transfer switch (ATS), • uninterruptible power supply (UPS) and maintenance bypass panel, • power distribution unit (PDU) (or sub-panel from UPS), • rack level PDU, • and servers’ internal power supply In most cases, server administrators are not involved in the design or operation of the first four items. But they do directly control the rack-level PDU and server power supply. A very common cause of power failures occurs at this level.
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