We get several alarms about disk space usage above 100% .
"A high threshold for the following metric exceeded: label=“D:\ Label:Data Serial Number 363c2fb2” ds=“hrStorageUsed / hrStorageSize * 100.0” description=“Trigger an alert when the percentage of disk space used reaches or goes above 90% for two consecutive measurement intervals (only for disks of type hrStorageFixedDisk, such as a locally attached or USB-attached hard disk)” value=“109.24” instance=“2” instanceLabel=“D” resourceType=“hrStorageIndex” resourceId=“node.hrStorageIndex[D]” threshold=“95.0” trigger=“2” rearm=“85.0”
(Ignore the 90% in the description, forgot to change that text when I changed the thresholds)
This is obviously wrong.
In this particular example we are monitoring a disk on a virtual server (VMWare environment), the disk is 9TB in size and Windows reports about 7% free space.
OpenNMS gets the values using SNMP by the way.
A correct percentage and no alarm to be triggered
Other relevant data:
[e.g. logs from OpenNMS, error messages etc]