host-resources disk usage in bytes

"Deon van der Merwe" <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>
Hi All,

(new on list, have been using net-snmp with great success for 2years+)

We run net-snmp 5.1.2 (and newer) on Linux (mostly Slackware and some Fedora).

One of our servers ran out of diskspace last week and I could not
understand why we did not get a trap notification.  We query net-snmp
for the diskusage and send traps based on that (*not* with snmptrapd).

These are the fields that we use:
HOST-RESOURCES-MIB::hrStorageIndex.4 = INTEGER: 4
HOST-RESOURCES-MIB::hrStorageType.4 = OID:
HOST-RESOURCES-TYPES::hrStorageFixedDisk
HOST-RESOURCES-MIB::hrStorageDescr.4 = STRING: /
HOST-RESOURCES-MIB::hrStorageAllocationUnits.4 = INTEGER: 4096 Bytes
HOST-RESOURCES-MIB::hrStorageSize.4 = INTEGER: 8517017
HOST-RESOURCES-MIB::hrStorageUsed.4 = INTEGER: 6661024

According to net-snmp disk usage percentage is: 78.20%
Different than df, but df is also strange...
[dvdm@kaus] df -B4096
Filesystem           4K-blocks      Used Available Use% Mounted on
/dev/sda3              8517017   6661036   1423331  83% /

Again it reports 83% use, but if you do the calculation yourself you
get: 78.20% which is the same as net-snmp... but what about this 83%
then?

Turns out that "used" (for both df and netsnmp) is the "files bytes
used".  The percentage calculated by df is done with the "inode bytes
used".

The question then: is there any place where net-snmp will report the
"inode bytes used"?  Should the "HOST-RESOURCES-MIB::hrStorageUsed" be
changed to also include the inode size usage?

Or perhaps there is a better/cleaner way of getting around this?

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