Download Shelf Manager User Guide

Pigeon Point Shelf Manager User Guide
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current one, the Shelf Manager reduces power consumption of the FRU by assigning it the
next lower power level.
In the critical alert cooling state (non-recoverable thermal thresholds are crossed for one or
more sensors) the Shelf Manager sets the fan level to maximum for the fans that serve the
cooling zone(s) where those thresholds have been crossed. In addition, if the thermal
condition is caused by a specific FRU, the FRU is powered down. If the thermal alert is
caused by a shelf-wide temperature sensor, all FRUs are powered down, as prescribed by
the PICMG 3.0 specification. After a FRU is powered down, its further handling by the Shelf
Manager depends on the value of the configuration variable
COOLING_KEEP_POWERED_OFF_FRUS_IN_M1.
If this variable is set to FALSE (which is the default), the FRU is activated but kept in state
M3 until the thermal alert goes away. The cooling state in which the FRU can be powered
back is specified by the value of the configuration variable
REAPPLY_POWER_MAX_COOLING_STATE. By default, this state is ―Normal‖; when
the shelf cools down sufficiently and the shelf cooling state reaches the specified state, the
Shelf Manager powers the FRU back on.
Otherwise, if the configuration variable is set to TRUE, the FRU stays in the state M1
indefinitely and is not automatically powered back on when the thermal alert goes away; in
that case an intervention by the System Manager or by an operator is needed to activate and
power on the FRU.
Also, when a new FRU is installed in the shelf when the shelf is in the critical alert cooling
state, by default it is not powered up and stays in M3 until the critical alert goes away. This
behavior can be overridden by the configuration variable
ALLOW_POWER_UNRELATED_FRU_IN_CRITICAL_STATE. If this variable is set
to TRUE, a new FRU can be powered up if: 1) the critical alert state is caused by a
temperature sensor that belongs to a different FRU and 2) the critical alert state is not caused
by a shelf-wide temperature sensor).
In addition, a fan management strategy is implemented that sets the fan level to the
maximum for all fans in the cooling zone in the following cases:
If some fans are missing in the shelf, based on the fan population specified in the Address
Table in the Shelf FRU Information, all fan trays that cool the same zone(s) as the missing
ones, are set to maximum.
If one or more of the fan tachometer sensors have a major or critical threshold crossed (a fan
is stopped or rotates too slowly), all fan trays that cool the same zone(s) as the underspeed
fan(s) are set to maximum speed. The number of simultaneously underspeed fans that cause
the remaining fans to go full speed is configurable via the configuration parameter
TURBO_MODE_MIN_FAN_FAILURES (and the default value is 1). Setting this
parameter to 0 turns off this feature.
The default cooling management strategy optionally supports leaving cold-sensitive FRUs
that are too cold at the time of shelf startup unpowered until they warm up. This may be
useful for shelves installed in severe climate conditions. A special Pigeon Point OEM-specific
record must be present in the Shelf FRU Information to activate this feature. This record
contains the list of IPMB addresses and FRU IDs of FRUs considered cold-sensitive. A coldsensitive FRU is considered too cold if any temperature sensor associated with it generates
an event at startup that indicates that the temperature is below the lower non-recoverable
Release 3.5.1
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August 17, 2015