Monitoring an ESXI server with snmp

Hi

I have a ESXI server running some VM.

I would like to trace some HW parameter such as CPU temperature, fan speed, CPU load with cacti

To do that I need the oid of each parameter I want to check.

I get the VMWARE MIBS 6.5 zip file with a lot of mib file inside.

2 questions :

- How do I know if a mib file is already installed and running in my esxi ?

- how do I find an oid ? (I try to look in the VMWARE-ENV-MIB.mib file but no temperature in the mib description)

For information snmp seems to work fine on my esxi.

When I try a snmpwalk, I get plenti of OID but whitout enought description to find the OID I am looking for.

Thanks