chasPowerSupplyRedundancyReserve

When chasPowerSupplyRedundancyReserve is enabled, N+1 power supply 
redundancy reserve holds the wattage of one power supply in reserve 
such that the user cannot insert NIs or configure power over Ethernet (POE)
that will use the reserved power from that supply. There are two main advantages 
to enabling chasPowerSupplyRedundancyReserve. The first advantage is that 
it provides resiliency to avoid POE drawing power from the four main power supplies
in the OS9900 chassis to the extent that POE sinks much more wattage than 
the CMM, CFM, and NI board logic combined. (Note: The power management functions 
on the OS9900 are complicated by the presence of the controllers on the GNI-P48 boards. 
Unlike other chassis supporting POE, like OS6860, there is no separate power supply 
for the POE front-panel ports.) This is not to be confused with chasPowerSupplyRedundancy 
which switches off unneeded power supplies - on the OS9900, all inserted power supplies
are always switched on and enabled. The second advantage of enabling 
chasPowerSupplyRedundancyReserve is to avoid 'brown-outs'. 
(A brown-out may happen when a system running at full POE capacity without the N+1 redundancy reserve
enabled suffers a power supply failure causing the POE hardware to immediately
disable power over Ethernet on the basis of port priority as soon as it detects the failure.
Then, if there is still insufficient power available to run the logic and fan trays,
the power supplies will 'crowbar' and the system will be power cycled. The software can 
do little in this scenario since there is insufficient power to keep the CPU chips running.
When the system reboots the chassis supervisor will only power-up NI slots based 
upon the power available from the remaining power supplies.)

MIB

ALCATEL-ENT1-CHASSIS-MIB

OID

.1.3.6.1.4.1.6486.801.1.1.1.3.1.1.3.1.25

Type

column

Access

readwrite

Status

current

Parent

chasChassisEntry