[mrtg] Memory Usage with Changing Instances

[Jonathan Black]

I've been trying to graph Physical Memory usage on a Windows 2003 Server 
and run into a problem with changing OIDs. This server has a USB 
Removable Hard Disk plugged in that gets swapped out about once a week. 
The problem is whenever I unplug or replug the hard disk the OID for the 
Physical Memory Usage changes. A SNMPWALK is attached below:

c:\>snmpwalk -v 2c -c public localhost HOST-RESOURCES-MIB::hrStorageDescr
HOST-RESOURCES-MIB::hrStorageDescr.1 = STRING: A:\
HOST-RESOURCES-MIB::hrStorageDescr.2 = STRING: C:\ Label:  Serial Number
HOST-RESOURCES-MIB::hrStorageDescr.3 = STRING: D:\
HOST-RESOURCES-MIB::hrStorageDescr.4 = STRING: E:\ Label:Removeable USB 
Drive
HOST-RESOURCES-MIB::hrStorageDescr.5 = STRING: F:\ Label:DATA  Serial 
Number
HOST-RESOURCES-MIB::hrStorageDescr.6 = STRING: Virtual Memory
HOST-RESOURCES-MIB::hrStorageDescr.7 = STRING: Physical Memory

Above the USB drive is .4 and physical memory is .7 at this point.


c:\>snmpwalk -v 2c -c public localhost HOST-RESOURCES-MIB::hrStorageDescr
HOST-RESOURCES-MIB::hrStorageDescr.1 = STRING: A:\
HOST-RESOURCES-MIB::hrStorageDescr.2 = STRING: C:\ Label:  Serial Number
HOST-RESOURCES-MIB::hrStorageDescr.3 = STRING: D:\
HOST-RESOURCES-MIB::hrStorageDescr.4 = STRING: F:\ Label:DATA  Serial Number
HOST-RESOURCES-MIB::hrStorageDescr.5 = STRING: Virtual Memory
HOST-RESOURCES-MIB::hrStorageDescr.6 = STRING: Physical Memory

Now that the drive is removed Physical Memory shifts to .6 .




How can I specify the instance that matches "Physical Memory" and not 
actually an OID? Thanks!

Jonathan