HP SNMP not showing Power Consumption

[Gavin Williams ACT]

HI there,

I'm trying to set-up some additional monitoring on our HP DL3x0 G5/G6 estate using Nagios and SNMP...

One element that would be extremely useful is the current power consumption of the server...

Having downloaded the HP MIB pack and done some SNMP walking, I've found the right area under cpqHeFltTolPwrSupply (OID: .1.3.6.1.4.1.232.6.2.9). This show's 2 power supplies present, current status, model, serial number etc...
However what looks like the correct OID for the current power consumption is just returning 0's...

I'm looking at the subtree under .1.3.6.1.4.1.232.6.2.9.3.1.7 - cpqHeFltTolPowerSupplyCapacityUsed, however it just returns 0's...
SNMPWalk shows:
snmpwalk -v 2c -c public 10.0.31.197 .1.3.6.1.4.1.232.6.2.9.3.1.7
SNMPv2-SMI::enterprises.232.6.2.9.3.1.7.0.1 = INTEGER: 0
SNMPv2-SMI::enterprises.232.6.2.9.3.1.7.0.2 = INTEGER: 0

I've tried this across Windows and Linux servers, of the G5 and G6 variety, and no joy...

Any ideas?

Cheers
Gavin