Cooling Subsystem; Cooling Subsystem Behavior - HP Integrity rx2660 User's & Service Manual

booting (before the system has passed EFI_EXIT_BOOT_SERVICES), the BMC immediately
powers the server off on a button press, since there is no concept of soft shutdown in this state.
In the event that the OS is absent or hung, or that the manageability subsystem (specifically the
BMC) in the server is not responding, a greater than four second press of the power button is
required to power off the system (a less than four second press on the power button has no effect).
To ensure that the system powers on in a deterministic fashion, the power button must be masked
for four seconds after powering off.
Table 51 Power LED States
Definition
No AC power to the system
System power is turned on
System is shut down, but AC and housekeeping (standby) power are
active.
For high availability and safety reasons, this LED runs off the power rails, rather than under firmware
control.

Cooling Subsystem

The three fan cooling zones located within the rx2660 server provide N+1 redundancy for the
server using three identical dual fan assembly CRUs. In turn, each dual fan assembly CRU provides
additional N+1 redundancy for the fan cooling zone it controls. Each dual fan assembly CRU is
identified by the server as fans 1 through 12 both for logging purposes and for fault identification
on the diagnostic LED panel.
External cooling fan CRU failures are identified visually by a single green LED on the dual fan
assembly CRU that is turned on when one or both of the fans fail; logged as an IPMI event by fan
sensor logic; and identified as a fan assembly CRU failure by the BMC turning on the appropriate
LEDs on the System Insight Display panel.

Cooling Subsystem Behavior

The BMC chip located on the system board CRU controls fan speed on ambient air temperatures,
chip temperatures, server configuration, and fan operation or failure. Air is drawn through the
front of the server and pushed out the rear by the cooling fans. There are three cooling zones
cooled by the 12 server fans. Zone 1 is cooled by fans 1 through 4, zone 2 is cooled by fans 5
through 8, and zone 3 is cooled by fans 9 through 12. Each zone can have one fan failure and
still sufficiently cool the server. You can display fan status remotely with the iLO 2 MP ps command.
Within the HP integrity rx2660 server, temperature sensors report server temperatures to the BMC,
which controls fan speed based on this information.
Table 52 Cooling Subsystem Events That Light System Insight Display LEDs
Diagnostic
LED(s)
Fans (1- 1 2)
Fans (1- 1 2)
Sample IPMI Events
Type 02h, 0Ah:07h:01h
COOLING_UNIT_WARNING
Type 02h, 0Ah:07h:02h
COOLING_UNIT_FAILURE
Flash Rate
LED Off
Steady
Steady
Cause Source
Fan has either BMC
previously failed or
is degrading
Fan has failed and BMC
no longer meets
minimum
requirements
LED Color
Green
Amber
Notes
Cleared when fan is
replaced
Cleared when fan is
replaced
Cooling Subsystem 129