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Chapter 3 Connections
3.4 Power Supply Connection
ETERNUS DX80 S2/DX90 S2 Disk storage system User’s Guide -Site Planning-
Copyright 2013 FUJITSU LIMITED P3AM-4822-12ENZ0
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3.4.2 UPS Connection
It is recommended that an Uninterruptible Power Supply System (UPS) be used as the power supply source for
the ETERNUS DX Disk storage system to cope with power outages and momentary voltage drops in the normal
power supply.
Note that when connecting an ETERNUS DX Disk storage system to a UPS with one power supply line, the total
value of the power requirements for all the enclosures must not exceed the UPS output capacity.
When one of the power supply lines fails for redundantly configured UPS units with two power supply lines, all
of the power for the ETERNUS DX Disk storage system must be supplied from the other line. Select a UPS that
can supply sufficient power so that the total value of the power requirements does not exceed the UPS output
capacity in case only one power supply line is available.
For details about the necessary UPS output capacity, refer to the specifications of the UPS that is used.
A UPS must satisfy the following conditions:
● Rating capacity
Secure a sufficient rating capacity for the total value of the maximum power requirements for the
enclosures that are to be installed.
For the maximum power requirements of each enclosure, refer to "2.1 Installation Specifications" (page
27).
● Supply time
The total time for the server to shut down and for the ETERNUS DX Disk storage system to power off
(maximum of six minutes) must be taken into consideration for the power supply time of the battery.
● Switching time during power failure
The normal power supply must be switched to UPS output within 11ms after a power failure occurs.
● Socket type
If the power plug type and the socket type of the UPS do not match, it is necessary to equip the UPS (AC
output) with an appropriate type of socket. Request a qualified electrician to perform the necessary work to
make terminal block connections available.
● Power supply configuration
If a UPS is used, make sure that it supplies power to all the enclosures.
Configurations where the controller enclosure is powered by the UPS while the drive enclosures are
powered directly from AC are not supported.