Emprise 7000 Installation and Service Guide 9
Power Considerations
Power outlets must be located within 5 feet of an Emprise system and must be easily accessible.
Make sure that each outlet that you use for connecting an Emprise system is an electrically
grounded, isolated circuit.
Using a UPS
While not required, Xiotech strongly recommends the use of an Uninterruptible Power Supply
(UPS) for an Emprise 7000 system. Use a UPS that shuts down all server connections
before
it
shuts down the Emprise system. When server connections are shut down first, all server I/O will
be flushed to disk. Failing to use such a UPS may result in data loss, due to the implementation
of multiple levels of I/O queueing in Emprise.
The Emprise system components must connect to two Power Distribution Units (PDUs) for power
distribution. The PDUs should connect to separate, dedicated power circuits with a UPS at each
end, creating an environment where any single component should not lose power. Losing an
individual component such as an ISE may cause rebuilds. Using separate circuits for redundant
power reduces the occurrence of such rebuilds.
Best Practice:
Xiotech recommends that you connect the Emprise system components to
your corporate uninterruptible power supply (UPS) system. Connect each
Power Distribution Unit (PDU) to a separate circuit. Always power down system
controllers before powering down the ISE.
Caution:
If you are using a UPS with automated shutdown, program it to shut down the
servers before terminating power to the Emprise system.
Caution:
Each Emprise component should be connected to a power source with a fuse
or circuit breaker that is greater than the rating of the component. The power
source must also comply with national wiring standards. You must use PDUs
with the Emprise system.
Warning:
When connecting equipment to the supply circuit, check equipment nameplate
ratings to avoid overloading circuits. Overloading circuits may cause damage to
over-current protection devices and supply wiring.
Note:
The loss of an ISE or DataPac is not recognized as a failure unless there is I/O
to the device; therefore, if the servers are no longer sending I/O, and an ISE
loses power before the rest of the Emprise system fails, the ISE will not be
considered failed, and no rebuilds will be initiated. In addition, during the
power-on sequence, a warning will display if any components are missing.
