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Hardware Reference 21
Hitachi High-performance NAS Platform Components
Power Supply Unit (PSU600/PSU610)
The High-performance NAS Platform monitors the operational status of the
power supply modules so that the management interfaces can indicate the
physical location of the failed unit. However, it is not possible to distinguish
between failed components within a PSU module (such as built in fans).
The High-performance NAS Platform has dual, hot-swappable, load sharing,
AC power supplies. The power supplies are serviced and accessible from the
rear of the High-performance NAS Platform.
Mains power connections are an IEC inlet in each power supply. Each PSU is
only powered from its mains inlet. Two power feeds are required for the
system. Each PSU has an on/off switch to turn on and off the unit without
removing the power cabling. The power connections also have a retaining clip which
prevents accidental removal of the cable.
Each power supply auto-ranges over an input range of 100V to 240V AC, 50 Hz to 60 Hz.
Caution:
Do not operate a server with two different power supply models in the same
chassis for longer than it takes to replace the 2nd power supply. It is allowable to
operate a server with different models of power supply for up to 72 hours during the
PSU replacement process.
Battery
Each power supply includes a battery unit that is part of the High-performance NAS
Platform’s stable storage solution. The batteries within each PSU module operate in both
a redundant and parallel manner.
Both batteries must be present and charged to support the full NVRAM backup period, but
either battery on its own can backup the NVRAM for a shorter period of time. A fully-
charged, dual battery system should keep the High-performance NAS Platform’s NVRAM
alive for about 72 hours. Charging time will be at a rate of 8 hours of backup for every
hour of charging time, or approximately nine hours for a complete charge.
Warning:
PSU model 600 contains a lithium-ion battery that is not field-replaceable.
If the battery in a PSU model 600 fails, the entire PSU should be replaced, and the
failed unit must be disposed of responsibly. Contact Hitachi Data Systems Technical
Resource Center (TRC) for more information on disposing of a PSU. PSU model 610
contains a field-replaceable battery. If the battery in a PSU model 610 fails, contact
Hitachi Data Systems Technical Resource Center (TRC) to arrange for battery
replacement.
Table 20: PSU Status (Green/Amber)
Status Meaning
Green Mains, DC, and battery are okay
Amber PSU Failure
Off No mains connections or switched off