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[cacti-user] gaps in my graphs?

From: Ben Russo <ben@mu...> - 2004-08-18 22:10

I am using the cacti beta build from today.

I have just 7 hosts defined, and they are all ucd/net-snmp template 
hosts, each host has graphs for CPU, Free-mem, users, processes, 
interface traffic stats...

The graphs work most of the time. I am using cmd.php (not cactid)
The rrd.log doesn't report any errors.  The polling runs usually
finish in just a few seconds. The hosts that I am graphing are
idle and they don't have any network problems or any other issues.

The think is that some of the graphs look like a picket fence.
Obviously some of the polls are not returning errors properly.
But it isn't consistent across hosts or even across graphs of the
same host.
There doesn't seem to be anything in common with the gaps that
would explain it.

Any ideas?

[cacti-user] Re: gaps in my graphs?

From: Ben Russo <ben@mu...> - 2004-08-19 20:50

I'm still getting random gaps in my graphs.

Here is a link to a sample page on my CACTI server:
	http://ben.muppethouse.com/CACTI/SYSLOGDB-graph_view.php.html

If you see at the top the number of processes and the number of users
graphs have no missing data, they are continuous graphs all the way
across.

Scroll down a bit and you will see the disk space graphs, they show
that there are missing data.  I would understand if all the graphs
had gaps during the same polls, but this is really odd.

The rrd.log doesn't show any errors during this time period.
The polls are very fast, within a few seconds.

All of the other hosts have the same "random" gaps.

-Ben.

[cacti-user] Re: gaps in my graphs?

From: Ben Russo <ben@mu...> - 2004-08-19 21:18

I just turned on "MEDIUM" output in the rrd.log
this shows the results of the polls.
Something really odd is going on here...
It looks like the poller processes are getting the
right SNMP results from the hosts, but the
data isn't getting into the rra files correctly?

For example:

[root@... rra]# rrdtool dump \
remedy02_backup_remedy_app_server_proc_106.rrd \
| grep "2004-08-19 1"
...
<!-- 2004-08-19 16:55:00 EDT / 1092948900 --> <row><v> NaN </v></row>
<!-- 2004-08-19 17:00:00 EDT / 1092949200 --> <row><v> NaN </v></row>
<!-- 2004-08-19 17:05:00 EDT / 1092949500 --> <row><v> NaN </v></row>
<!-- 2004-08-19 17:10:00 EDT / 1092949800 --> <row><v> NaN </v></row>
...


But from the rrd.log:

[root@... log]# cat rrd.log | grep "proc" | grep remedy02
08/19/2004 04:55 PM - CMDPHP: Poller[0] Host[6] SNMP: v1: 
remedy02.reston.tnsi.com, dsname: proc, oid: .1.3.6.1.2.1.25.1.6.0, 
output: 51
08/19/2004 05:00 PM - CMDPHP: Poller[0] Host[6] SNMP: v1: 
remedy02.reston.tnsi.com, dsname: proc, oid: .1.3.6.1.2.1.25.1.6.0, 
output: 51
08/19/2004 05:05 PM - CMDPHP: Poller[0] Host[6] SNMP: v1: 
remedy02.reston.tnsi.com, dsname: proc, oid: .1.3.6.1.2.1.25.1.6.0, 
output: 51
08/19/2004 05:10 PM - CMDPHP: Poller[0] Host[6] SNMP: v2: 
remedy02.reston.tnsi.com, dsname: proc, oid: .1.3.6.1.2.1.25.1.6.0, 
output: 51

[cacti-user] Re: gaps in my graphs?

From: Ben Russo <ben@mu...> - 2004-08-20 15:28

So, I changed all my hosts to "v2" snmp polls yesterday
and it ran all night.  This morning the graphs were beautiful.

This morning I wanted to see if I could recreate the problem
and so I changed teh hosts back to "v1" and the gaps in the
graphs returned.

(note, that there could be an unidentified third cause?)

Anyway the really odd thing is that here is the output from
my rrd.log for one disk monitored on one host:

[root@... scripts]# grep remedy01 ../log/rrd.log | grep \
hdd | egrep "9.1.7.1|9.1.8.1"
...
08/20/2004 09:10 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 09:15 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 09:15 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 09:20 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 09:20 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 09:25 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 09:25 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 09:30 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 09:30 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 09:35 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 09:35 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 09:40 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 09:40 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 09:45 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 09:45 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 09:50 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 09:50 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 09:55 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 09:55 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 10:00 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 10:00 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 10:05 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 10:05 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 10:10 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 10:10 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 10:15 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216684
08/20/2004 10:15 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524428
08/20/2004 10:20 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216588
08/20/2004 10:20 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524524
08/20/2004 10:25 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216604
08/20/2004 10:25 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524508
08/20/2004 10:30 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216620
08/20/2004 10:30 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524492
08/20/2004 10:35 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216636
08/20/2004 10:35 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524476
08/20/2004 10:40 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216656
08/20/2004 10:40 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524456
08/20/2004 10:45 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216660
08/20/2004 10:45 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524452
08/20/2004 10:50 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_used, oid: 
.1.3.6.1.4.1.2021.9.1.8.1, output: 1216660
08/20/2004 10:50 AM - CMDPHP: Poller[0] Host[5] SNMP: v1: 
remedy01.reston.tnsi.com, dsname: hdd_free, oid: 
.1.3.6.1.4.1.2021.9.1.7.1, output: 4524452


As you can see from the rrd.log the OID was polled successfully every time.
The output looks beautiful.

However...  here is the output from rrdtool on ths file:


[root@... rra]# rrdtool dump \
remedy01_primary_remedy_app_server_hdd_free_96.rrd  | grep "2004-08-20 "
...
<!-- 2004-08-20 09:10:00 EDT / 1093007400 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 09:15:00 EDT / 1093007700 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 09:20:00 EDT / 1093008000 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 09:25:00 EDT / 1093008300 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 09:30:00 EDT / 1093008600 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 09:35:00 EDT / 1093008900 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 09:40:00 EDT / 1093009200 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 09:45:00 EDT / 1093009500 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 09:50:00 EDT / 1093009800 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 09:55:00 EDT / 1093010100 --> <row><v> 4.5244280000e+06 
</v><v> 1.2166840000e+06 </v></row>
<!-- 2004-08-20 10:00:00 EDT / 1093010400 --> <row><v> NaN </v><v> NaN 
</v></row>
<!-- 2004-08-20 10:05:00 EDT / 1093010700 --> <row><v> NaN </v><v> NaN 
</v></row>
<!-- 2004-08-20 10:10:00 EDT / 1093011000 --> <row><v> NaN </v><v> NaN 
</v></row>
<!-- 2004-08-20 10:15:00 EDT / 1093011300 --> <row><v> 4.5245240000e+06 
</v><v> 1.2165880000e+06 </v></row>
<!-- 2004-08-20 10:20:00 EDT / 1093011600 --> <row><v> 4.5245240000e+06 
</v><v> 1.2165880000e+06 </v></row>
<!-- 2004-08-20 10:25:00 EDT / 1093011900 --> <row><v> NaN </v><v> NaN 
</v></row>
<!-- 2004-08-20 10:30:00 EDT / 1093012200 --> <row><v> NaN </v><v> NaN 
</v></row>
<!-- 2004-08-20 10:35:00 EDT / 1093012500 --> <row><v> NaN </v><v> NaN 
</v></row>
<!-- 2004-08-20 10:40:00 EDT / 1093012800 --> <row><v> NaN </v><v> NaN 
</v></row>
<!-- 2004-08-20 10:45:00 EDT / 1093013100 --> <row><v> NaN </v><v> NaN 
</v></row>
<!-- 2004-08-20 10:50:00 EDT / 1093013400 --> <row><v> NaN </v><v> NaN 
</v></row>
...


Right now I am going to change the poller back to "v2" for all the hosts
and see if the graph data problem again disappears. After 20-30 minutes
on "v2" the gaps in the graphs are gone.