Gigamon GigaVUE-HC3, Hardware Installation Manual

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Assembling the GigaVUE-HC3 Node 55
Figure 3-6: Four Power Supply Modules Installed
Power Management
Power management controls power up/down of the modules in the GigaVUE-HC3 node
through software. It determines the priority of the modules to power up or down based
on the total PSMs present.
All four of the slots on the GigaVUE-HC3 are assigned a power priority. Slot 1 defaults
to the highest priority of 1. Slot 2 defaults to a priority of 2. Slot 3 defaults to a priority
of 3. Slot 4 defaults to the lowest priority of 4.
A GigaVUE-HC3 chassis can have up to four PSMs. The power supply modules can be
either AC or DC. Two or four PSMs are recommended for 1+1 redundancy (two PSMs)
or 2+2 redundancy (four PSMs). A mix of AC and DC power supply modules is not
recommended.
When all PSMs are plugged in and are up (LED status light is green), their power is
pooled and used to calculate the
available power . Available power is the total power
available to power up the modules in the GigaVUE-HC3. The modules present and
configured in the chassis are used to calculate
needed power. The modules are
powered up based on the available power. If the needed power is more than the
available power, only the modules in the higher priority slots are powered up.
For example, when the available power falls below the needed power due to a PSM
failing or being unplugged or removed, the module in the lowest priority slot is powered
down first. When additional power is added, power management powers up the
modules present in the higher priority slots before it powers up the modules in the lower
priority slots.
When a module is powered down by power management, the operational status of the
module is shown as
nopower in the output of the show cards command, which
indicates that it was powered down by power management.
N
OTE
:
Power management does not control power up/down of the control card.