[mrtg] SNMP Disk Space Negative Values

Christian Arnaut n8tgc at msn.com
Tue Nov 25 23:05:22 CET 2014

Am attempting to use MRTG to monitor disk space on a Windows Server as I have done on multiple servers and workstations in the past. However, this time the local storage capacity on the local drive partition is nearly 15TB. 
It appears that I have exceeded an SNMP threshold where the integer values are now negative numbers. For example to monitor total space on the C: drive I used (simplified)... iso. * iso.
iso. = STRING: "C:\\ Label:"
iso. = STRING: "E:\\ Label:"
iso. = INTEGER: 4096
iso. = INTEGER: 4096
iso. = INTEGER: 10350335
iso. = INTEGER: -268468737
iso. = INTEGER: 6261795
iso. = INTEGER: -527400222
With the E: drive, iso. correctly shows the cluster size (4096). However, I am sure the total number of clusters isn't '-527400222'. Even if I used the absolute value of 527400222, the numbers don't add up to the 15TB partition size. 
Any suggestions? Or have I reached the limitation of MRTG for the purpose I am looking for?
Thank you, in advance, for any assistance!

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