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%
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.
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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