NonStop S-Series Planning and Configuration Guide (G06.29+)

Enclosure Arrangements and Cable Connections
HP NonStop S-Series Planning and Configuration Guide—523303-021
7-12
Powering On
Powering On
A system can be powered on from a single power-on push button. To power on an
entire system, press the power-on push button on either of the PMF CRUs in group 01.
Powering Off
There are several ways to power off a system:
•
For nonemergency power-offs, issue a software command.
•
In an emergency, power off the system in one of these ways.
Requirements for Grounding
To ensure signal integrity in a multiple-row system, a signal reference grid is
recommended.
If a system is not connected to a signal reference grid, impedance points might cause
voltage differential between enclosures, degrading signals and causing loss of data
integrity.
A signal reference grid creates multiple, parallel ground conducting paths between
system enclosures, by distributing ground currents throughout multiple paths in a
raised floor structure, simulating a nearly equipotential reference plane for all computer
equipment installed on and connected to the grid.
When fiber-optic ServerNet cables are used instead of ECL or serial-copper cables,
grounding requirements might not be as restrictive.
For information, contact your HP trained service provider.
Emergency Power-Off
Method
Batteries Continue
to Power the System
for a Short Time Results
Unplug the AC power
cords from the external
power source.
Yes System treats this as a power failure
and continues to draw power from
the batteries.
Shut off power at the
circuit breaker.
Yes System treats this as a power failure
and continues to draw power from
the batteries.
In sites with installed
EPO equipment, use
the EPO switch.
No You might disconnect power to
entire computer room. Use caution
when using the EPO switch.