windows 2008r2 SNMP hrStorageSize reporting wrong values

Posted by Giannis Nohj on Server Fault See other posts from Server Fault or by Giannis Nohj
Published on 2012-10-09T00:00:42Z Indexed on 2012/12/14 17:05 UTC
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snmp

I'm trying to monitor disks on windows 2008 R2 system, but I'm getting wrong values returned from hrStorageSize and hrStorageUsed for one of the 2 disks the system has. Local disk C: is returning correct values, whereas D: disk, which is an SAN disk, is reporting 32G instead of 500G. Output of snmpwalk -v 2c -c public hostname-01 .1.3.6.1.2.1.25.2 :

HOST-RESOURCES-MIB::hrStorageDescr.1 = STRING: C:\ Label:  Serial Number 7ff87ca6
HOST-RESOURCES-MIB::hrStorageDescr.2 = STRING: D:\ Label:Data  Serial Number dab5b0b9
...
HOST-RESOURCES-MIB::hrStorageAllocationUnits.1 = INTEGER: 4096 Bytes
HOST-RESOURCES-MIB::hrStorageAllocationUnits.2 = INTEGER: 4096 Bytes
...
HOST-RESOURCES-MIB::hrStorageSize.1 = INTEGER: 35834383
HOST-RESOURCES-MIB::hrStorageSize.2 = INTEGER: 7864320
...
HOST-RESOURCES-MIB::hrStorageUsed.1 = INTEGER: 32460169
HOST-RESOURCES-MIB::hrStorageUsed.2 = INTEGER: 3192302

I have calculated the first disk (C:) size as 136G, which is correct. On the other hand, D: is calculated as 30G, where it should be 500G. I also tried fsutil on the system and the output was correct.

Anyone have any ideas?

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