[mrtg] Problem getting drive size and graphing right

Mon Feb 9 02:36:45 MET 2004

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Hi everyone-

I'm having a problem getting a server disk space graph to look right-

I'm graphing two different OIDs - one for the available space, and one for=
 space used-

The idea is to get one  line that shows in use, and the green graph to show=
 what's available.

I don't get the line showing in use, only the one that shows space=
 available on the graph.
The summary lines show space available and space used (but the sizing is=
 wrong)
That, and the percentage it's showing is apparently the difference, not the=
 used space?

Max 683.1 GBytes (0.1%) Average 681.0 (0.1%) Current 683.1 (0.1%)

The space should be something like 768 GB
The allocation units are 4096, but if I multiply by this, I get _way_ wrong=
 answers
Multiplying by 4 (as someone else's example showed) gets the graph closer...
Here's a couple snmpwalks to show what's actually going on...
[root at acslinux root]# snmpwalk -v 2c -c xxxx xxxx=
 .iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEn=
try.hrStorageAllocationUnits.4
HOST-RESOURCES-MIB::hrStorageAllocationUnits.4 =3D INTEGER: 4096 Bytes
The actual drive size is:
[root at acslinux root]# snmpwalk -v 2c -c xxxxx xxxxx=
 .iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEn=
try.hrStorageSize.4
HOST-RESOURCES-MIB::hrStorageSize.4 =3D INTEGER: 179068514
This is not showing up in the graph as 768GB  (179068514 * 4096 =3D=
 733464633344 )=20
which is _still_ not the 768GB  Windows reports for that drive..close,=
 though...

Here's the config:

# MRTG config file for disk space on myserver E: drive
# drive description
#.iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEn=
try.hrStorageDescr.4
# drive available space
#.iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEn=
try.hrStorageSize.4
# drive used space
#.iso.org.dod.internet.mgmt.mib-2.host.hrStorage.hrStorageTable.hrStorageEn=
try.hrStorageUsed.4
# Seems to be in whatever the hrStorageSize is- we've multiplied by that=20
#to get values...

WorkDir: /var/www/html/mrtg

# myserver E drive disk space
Target[myserver]:.1.3.6.1.2.1.25.2.3.1.5.4&.1.3.6.1.2.1.25.2.3.1.6.4:commst=
r at myserver * 4
Title[myserver]: myserver E drive space
MaxBytes[myserver]: 720000000000
AbsMax[myserver]:   733464633343
Options[myserver]: gauge,unknaszero,growright,nobanner,noo
PageTop[myserver]: <h1>myserver disk usage for the E: drive</h1>
YLegend[myserver]:  GB stored
ShortLegend[myserver]: Bytes
kMG[myserver]: k,M,G
Legend1[myserver]: HDD Utilization
Legend2[myserver]:
Legend3[myserver]: Max value per interval on graph
Legend4[myserver]: 2061993242624
LegendI[myserver]: &nbsp
LegendO[myserver]: .
Colours[myserver]:GREEN#00eb0c,BLUE#0000ff,GRAY#AAAAAA,VIOLET#ff00ff
WithPeak[myserver]: ymw
kilo[myserver]: 1024
Xsize[myserver]: 600
Ysize[myserver]: 200
Ytics[myserver]: 10

[root at acslinux root]#=20

Anyone have some ideas about what's not right here?
Thanks, Tim

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