I am trying to monitor the XenServer farm (hosts) version 5.5 and 5.6.
I enabled SNMP on the servers and the tests are fine (green).
However, when I go to manage nodes "List Resources" returns nothing. (I'd like to see the CPU, memory or at least the interfaces)
On couple servers I edited the snmpd.conf file, adding this line:
view systemview included 1.3.6.1.4.1.2021
On those, I get some results but only for the hypervisor (aka it says total memory 750 MB when my server has 96GB!!!)
Is there any instructions how get this done? Google (or thwack) were useless on this 
Thank you.