disk space snmp from synology NAS device

I am trying to get openNMS to graph disk usage on a synology DSM device. 
It is a small one drive nas device that seems to be using standard linux 
and net-snmp. opennms can see other snmp data, but nothing for drive 
space/usage. When i issue snmpwalk i can see the snmp info for drives:

#snmpwalk -v2c -c public 10.1.1.4 | grep Used

HOST-RESOURCES-MIB::hrStorageUsed.1 = INTEGER: 105436
HOST-RESOURCES-MIB::hrStorageUsed.3 = INTEGER: 182208
HOST-RESOURCES-MIB::hrStorageUsed.6 = INTEGER: 2384
HOST-RESOURCES-MIB::hrStorageUsed.7 = INTEGER: 71612
HOST-RESOURCES-MIB::hrStorageUsed.10 = INTEGER: 76772
HOST-RESOURCES-MIB::hrStorageUsed.31 = INTEGER: 127908
HOST-RESOURCES-MIB::hrStorageUsed.32 = INTEGER: 102843447
HOST-RESOURCES-MIB::hrStorageUsed.33 = INTEGER: 0

but it doesnt show up at all in opennms graphs. Any ideas about how to 
get it to work?

thanks

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