HP Retail Manageability - White Paper

CPU Fan Speed, Front Chassis Fan Speed, Rear Chassis Fan Speed, Power Supply

Fan Speed, and CPU Thermal Index.

With HP CMI, Power On Self Test (POST) events will be surfaced into WMI if the

system successfully boots into Windows®. General WMI alerts will also be

surfaced for the following conditions:

• Fan Stall: If one of the system fans falls below its specified threshold, the system

will generate an alert indicating which fan has stalled. Note that this does not

cover the fan built into the power supply.

• Thermal Over-temp: If one of the thermal sensors within the platform exceeds its

threshold, an event is surfaced indicating which sensor triggered the fault (e.g.,

CPU or Chassis)

• Hood Removal: For systems with this feature, the platform will also fire a WMI

event if the hood has been removed. This condition is only checked during the

system POST operation and flagged once regardless if the hood was removed

and replaced multiple times. On the next successive system boot, the flag is

reported to WMI.

The fan stall and thermal over-temp sensors will also create WMI events when they

de-assert or fall out of failing condition. Management agents can also forward all

of these WMI events to the management console.

The namespace for HP CMI is root\hp\instrumentedbios, which can be viewed

with WMI CIM Studio and similar tools. WMI CIM Studio is included in WMI

Tools, which can be downloaded from the Microsoft Download Center [1]. It can

be accessed programmatically using any language capable of supporting

Component Object Model (COM), PowerShell, or scripting languages under

Windows® Scripting Host. For example, the following VBScript enumerates the

available sensors:

Const wbemFlagReturnImmediately = 16

Const wbemFlagForwardOnly = 32

lFlags = wbemFlagReturnImmediately +

wbemFlagForwardOnly

strService =

"winmgmts:{impersonationlevel=impersonate}//"

strComputer = "."

strNamespace = "/root/HP/InstrumentedBIOS"

strQuery = "select * from HP_BIOSSensor"

Set objWMIService = GetObject(strService & strComputer

& strNamespace)

Set colItems =

objWMIService.ExecQuery(strQuery,,lFlags)

Counter = 1

For Each objItem In colItems

WScript.Echo Counter & vbTab & objItem.Name

Counter = Counter + 1

The same information can be obtained using PowerShell: