[Info-vax] Temperature information via OpenVMS

[Stephen Hoffman]

On 2018-05-02 17:29:26 +0000, Mark Berryman said:

> Is there any way to retrieve current ambient temperature information 
> from within OpenVMS on either a DS15 or an rx2620?  Whether I try DCL 
> or call the system service directly, I get the error:
> 
> %SYSTEM-E-NOT_LOADED, system service or exec routine is not loaded
> 
> Does the necessary support exist?

If it's not available in the SNMP MIB data, then the last time I went 
looking for this environmental and thermal data a while back, it's 
buried in a very deep rabbit hole of very undocumented and amazing 
cryptic APIs.   The Insight Management agents and related WBEM/WEBES/IM 
tools are the official path to this and related data, though at least 
some of it might also be visible via the OpenVMS SNMP MIBs.   With the 
Marvel-class AlphaServer boxes, the undocumented system service 
$get_env_sensors system and the definition of the semi-documented 
WBEM$PRIVATEER logical name is the usual path.  And this whole area can 
be a deep, deep rabbit hole.   Conversely, middle-vintage I2C-based 
AlphaServer boxes do have SYI$_TEMPERATURE_VECTOR, SYI$_POWER_VECTOR, 
SYI$_FAN_VECTOR and SYI$_THERMAL_VECTOR.   Plugging in an APC NetBotz 
or (more recently) an Apple Homekit sensor is likely vastly easier than 
wading into one of the newer boxes, if it's not in the MIBs.


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