I can still not generate the CPU graph after adding GAUGE to my config.
I really have no idea now. The CPU graph generated by MRTG is not all
'zero's, after I zoom the graph and seeing it careful, it doesn't
generate CPU
statistics at all.
Here I'll give out my config completely:
In mrtg server, my config is:
#
# Define global options
#
LoadMIBs: /usr/share/snmp/mibs/UCD-SNMP-MIB.txt,/usr/share/snmp/mibs/
TCP-MIB.txt
workdir: /var/www/mrtg/
#
# CPU Monitoring
# (Scaled so that the sum of all three values doesn't exceed 100)
#
Target[cluster1.cpu]:ssCpuRawUser.0&ssCpuRawUser.0:[EMAIL PROTECTED]
+ ssCpuRawSystem.0&ssCpuRawSystem.0:[EMAIL PROTECTED] + ssCpuRawNice.
0&ssCpuRawNice.0:[EMAIL PROTECTED]
Title[cluster1.cpu]: Server CPU Load
PageTop[cluster1.cpu]: <H1>CPU Load For Cluster1- System, User and
Nice Processes</H1>
MaxBytes[cluster1.cpu]: 100
ShortLegend[cluster1.cpu]: %
YLegend[cluster1.cpu]: CPU Utilization
Legend1[cluster1.cpu]: Current CPU percentage load
LegendI[cluster1.cpu]: Used
LegendO[cluster1.cpu]:
Options[cluster1.cpu]: gauge,withzeroes,noo,growright
Unscaled[cluster1.cpu]: ymwd
Here I also want to give out my memory stat config(which works
correctly):
#
# Memory Monitoring (Total Versus Available Memory)
#
Target[cluster1.memory]: memAvailReal.0&memTotalReal.0:[EMAIL PROTECTED]
Title[cluster1.memory]: Free Memory
PageTop[cluster1.memory]: <H1>Free Memory For Cluster1</H1>
MaxBytes[cluster1.memory]: 100000000000
ShortLegend[cluster1.memory]: B
YLegend[cluster1.memory]: Bytes
LegendI[cluster1.memory]: Free
LegendO[cluster1.memory]: Total
Legend1[cluster1.memory]: Free memory, not including swap, in bytes
Legend2[cluster1.memory]: Total memory
Options[cluster1.memory]: gauge,growright,nopercent
kMG[cluster1.memory]: k,M,G,T,P,X
And I don't think there's any problem in snmpd config in target
machine, because I can get the CPU info correctly on mrtg server:
snmpwalk -v 1 -c public 172.16.6.183 UCD-SNMP-MIB::ssCpuRawUser
UCD-SNMP-MIB::ssCpuRawUser.0 = Counter32: 1230311
snmpwalk -v 1 -c public 172.16.6.183 UCD-SNMP-MIB::ssCpuRawSystem
UCD-SNMP-MIB::ssCpuRawSystem.0 = Counter32: 1072451
I don't know why Memory collection works but CPU stat not work,
because they are using the same MIB and have very similar configs.
I'm really frustrated because I cannot find where I'm wrong. Can
anyone help me?
Thanks!
- Li Wei Nan
On Sep 3, 2008, at 7:04 AM, Steve Shipway wrote:
Let me guess – you’re storing and displaying just zeros, right?
You need to read up on the difference between a COUNTER (the default
MRTG mode) and a GAUGE.
A COUNTER is a total count, such as with network traffic. Here, you
want to graph the RATE OF CHANGE of the value.
A GAUGE is an absolute value. Here, you want to graph the
UNMODIFIED VALUE.
Since a CPU usage is a gauge (IE, it is not a constantly increasing
count, such as with network bytes transmitted) you need to add the
‘gauge’ option, otherwise you will graph the rate of change, which
will usually be zero. You can think of the CPU usage OID as a
‘number of seconds CPU time used per second’, IE a rate. Since it
is already a rate, you do not want the default ‘counter’ mode.
Similarly, with a memory value, you will probably want the ‘gauge’
option.
If (for example) you were monitoring a count of total pages printed
by a printer, then this would be a ‘counter’ and you’d want to see
the rate of change instead.
Summary: always add the gauge option, unless you’re sure the value
you are retrieving is a constantly increasing count rather than a
rate.
You probably want to add the ‘noo’ option as well to suppress the
second line.
If you’re using routers2 as your frontend, also add the extended
options ‘fixunit’ and ‘nototal’. It will help the display look
better for small values.
Steve
Target[cluster1.cpu]:ssCpuRawUser.0&ssCpuRawUser.0:[EMAIL PROTECTED]
+ ssCpuRawSystem.0&ssCpuRawSystem.0:[EMAIL PROTECTED] +
ssCpuRawNice.0&ssCpuRawNice.0:[EMAIL PROTECTED]
Title[cluster1.cpu]: Server CPU Load
PageTop[cluster1.cpu]: <H1>CPU Load For Cluster1- System,
User and Nice Processes</H1>
MaxBytes[cluster1.cpu]: 100
ShortLegend[cluster1.cpu]: %
YLegend[cluster1.cpu]: CPU Utilization
Legend1[cluster1.cpu]: Current CPU percentage load
LegendI[cluster1.cpu]: Used
LegendO[cluster1.cpu]:
Options[cluster1.cpu]: growright,nopercent
Unscaled[cluster1.cpu]: ymwd
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