ServerNet Cluster 6770 Hardware Installation and Support Guide

Planning for the ServerNet Cluster Switch
ServerNet Cluster 6770 Hardware Installation and Support Guide—522544-002
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Planning for Power to the ServerNet Cluster Switch
Planning for Power to the ServerNet Cluster
Switch
AC Power Requirements
Make sure that your AC power meets these requirements for the ServerNet Cluster
Switch.
Planning to Respond to Power Failures
External devices, such as the ServerNet II Switch, are not backed up by the batteries
in the NonStop S-series system enclosures. Fault tolerance for the ServerNet II Switch
is provided by dual external fabrics, dual power rails, and the battery in the UPS. For
more information about power planning, refer to the NonStop S-series Planning and
Configuration Guide.
How the ServerNet II Switch responds to a power failure depends on how utility power
is provided to the components. Careful planning can reduce or prevent unnecessary
outages. HP recommends that you connect the primary and secondary power cords for
an AC transfer switch to two independent AC power sources. For maximum fault
tolerance, consider using four independent AC power sources, one for each power rail
on both fabrics.
Characteristic Range
Power consumption for the ServerNet II Switch, UPS, and
AC transfer switch (UPS battery fully charged)
115 watts
Power consumption for the ServerNet II switch, UPS, and
AC transfer switch (charging UPS battery)
400 watts
AC input voltage for U.S. and Japan 100-120 VAC, 50 Hz/60 Hz,
4 amps
AC input voltage for Europe 200-240 VAC, 50 Hz, 2 amps
If this fails... Then...
Primary power rail If the secondary power rail is on a separate AC power
source, the secondary power rail provides power to the
ServerNet Cluster Switch.
If the secondary power rail is not on a separate AC power
source, the UPS provides power to the ServerNet II Switch.
Both primary and secondary
power rails
The UPS battery provides power to the ServerNet II Switch
for approximately 2 hours. Make sure that the battery in the
UPS is always fully charged. Immediately correct any
problem that causes the battery to become drained.
Both power rails and the UPS Fault tolerance is provided by the ServerNet Cluster Switch
on the other fabric if the switch is receiving power from a
different source.