Server Disk utilization Formula(SNMP)

Server Disk utilization Formula(SNMP)

OpManager uses HostResources.mib and its OIDs to calculate the disk utilization. The OIDs(and the responses) that you have to check are

1).1.3.6.1.2.1.25.2.3.1.2 :hrStorageType

2).1.3.6.1.2.1.25.2.3.1.4 : hrStorageAllocationUnits

3).1.3.6.1.2.1.25.2.3.1.5: hrStorageSize

4).1.3.6.1.2.1.25.2.3.1.6: hrStorageUsed

OpManager uses the first OID (hrStorageType) to find the list of fixed disks and the next 3 OIDs will be used for actual calculation only for those Fixed disks.

Refer the attached image with the SNMP response for the above mentioned OIDs. Click Settings-->Tools MIB Browser  and load Host Resources-MIB and provide the device details and its community string and check responses for those OIDs.



Note:You can also check the same using the standalone MIB browser by Open CMD prompt as Admin and execute mibbrowser.bat under /opmanager/bin. Load HostResources.mib and query the OIDs mentioned above.

Out of 5 instances last three are the actual fixed disks(partitions). Others are RAM info and removable disks.  So the we need to use only the last 3 instances for calculation.


Here is the Calculation for disk utilization

(hrStorageAllocationUnits*hrStorageUsed)*100/(hrStorageAllocationUnits*hrStorageSize)


Total used= 4096*20363308+ 4096*748795+ 4096*28642= 86592491520 bytes = 86.59GB

Total HD size=4096*64607743+ 4096*34365439+ 4096*25599999=510251749376 bytes= 510.2GB


So Disk Utilization(%)=86.59*100/510.2=16.97%

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