snmp disk percentages

[Alan Silver]

Hi all:

I have been using nagios for a few years now and I was just going 
through my configs and changing the way I do things.
Suffice it to say, I have been trying to use some of the new plugins 
that allow you to grab the disk percentage used for a filesystem via 
snmp. And I have been coming up with percentages which are slightly 
different than what df -k is saying (2-5%).  Here are a few examples.......

BTW, I have tried these perl scripts on a solaris 8 box running nagios 
1.2 and a redhat enterprise linux 4 box running 2.0b2. Both instances 
gave me the same "inaccurate" answers.

So, here is some info for you to look at:
Here is the df of the box I would like to monitor, call it gilead
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/dsk/c0t0d0s0     962134  181392  723014    21%    /

I used
[root at gandalf contrib]# ./check_snmp_disk_monitor.pl -H gilead -C mejis 
-s -m /
Disk OK - 19% used on /|/,985225216,185745408

[root at gandalf contrib]# ./check_snmp_storage.pl -H gilead -C mejis  -m 
/  -r -w 80 -c 81
/ : 19 %used (177MB/940MB)  (<  80) : OK

[root at gandalf contrib]# ./disk_by_snmp  gilead  mejis 1  30 40
Disk usage: 177 MB used, 762 MB (81%) free.

If I use straight snmp to walk gilead, I can see:
.iso.org.dod.internet.private.enterprises.ucdavis.dskTable.dskEntry.dskPercent.1 
= INTEGER: 20
(which is also slightly off when compared with df -k)

.iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEntry.hrStorageDescr.1 
= STRING: /
.iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEntry.hrStorageAllocationUnits.1 
= INTEGER: 1024 Bytes
.iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEntry.hrStorageSize.1 
= INTEGER: 962134
.iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEntry.hrStorageUsed.1 
= INTEGER: 181392

So, I guess my issue with how these scripts are calculating disk 
percentage based on the disk used / disk alloted. Which may not be 
completely accurate with how much percentage is still usable for the 
user. Does anyone know of a script which goes after the 
.iso.org.dod.internet.private.enterprises.ucdavis.dskTable.dskEntry.dskPercent 
oid instead of trying to calculate from disk used/disk allocated?  I 
have used check_snmp in the past. But since different partitaion are 
indexed different on my hosts, I was hoping someone had a nice perl 
program which took care of the index issue for me

Thanks

alan






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