Question about graph scale and units

Discussion:

L P

2011-10-19 07:43:41 UTC

L P [http://community.zenoss.org/people/GOM] created the discussion

"Question about graph scale and units"

To view the discussion, visit: http://community.zenoss.org/message/61965#61965

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I'm having trouble getting the right units for some of my graphs.
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Essentially I have a Nagios-style data source:

redacted OK datapoint 94630 | redacted=94630;;;;

The problem is that "1.0" on the Y axis really reflects 100 (one hundred). No idea why the data is off by factor of 10.

I've actually fiddled with the graph definition a bit trying to get what I'm after. What I want it to say is something like "0" to "200", without the si units, and showing the real values from the check (without being off by *(-10) )

Anyone understand why this could happen and how to correct it?

Here's what the setup looks like:

*Data source:*
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*Data point:*
*Loading Image...

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*
*Graph Definition:*
*Loading Image...

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*
I changed the Y to 0, 1 trying to adjust the Y. Still the data shown is off by factor of -10

*Graph Point*
*Loading Image...

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*
Forgive the "redactions". Understand that probably looks sort of insane.

*rrdtool info:*

rrd_version = "0003"
step = 60
last_update = 1319009170
ds[ds0].index = 0
ds[ds0].type = "DERIVE"
ds[ds0].minimal_heartbeat = 180
ds[ds0].min = 0.0000000000e+00
ds[ds0].max = 1.0000000000e+02
ds[ds0].last_ds = "94694"
ds[ds0].value = 1.7567606446e-01
ds[ds0].unknown_sec = 0
rra[0].cf = "AVERAGE"
rra[0].rows = 600
rra[0].cur_row = 506
rra[0].pdp_per_row = 1
rra[0].xff = 5.0000000000e-01
rra[0].cdp_prep[0].value = NaN
rra[0].cdp_prep[0].unknown_datapoints = 0
rra[1].cf = "AVERAGE"
rra[1].rows = 600
rra[1].cur_row = 389
rra[1].pdp_per_row = 6
rra[1].xff = 5.0000000000e-01
rra[1].cdp_prep[0].value = 8.0405398926e-02
rra[1].cdp_prep[0].unknown_datapoints = 0
rra[2].cf = "AVERAGE"
rra[2].rows = 600
rra[2].cur_row = 412
rra[2].pdp_per_row = 24
rra[2].xff = 5.0000000000e-01
rra[2].cdp_prep[0].value = 3.9707206559e-01
rra[2].cdp_prep[0].unknown_datapoints = 0
rra[3].cf = "AVERAGE"
rra[3].rows = 600
rra[3].cur_row = 524
rra[3].pdp_per_row = 288
rra[3].xff = 5.0000000000e-01
rra[3].cdp_prep[0].value = 4.4772179655e+00
rra[3].cdp_prep[0].unknown_datapoints = 1
rra[4].cf = "MAX"
rra[4].rows = 600
rra[4].cur_row = 324
rra[4].pdp_per_row = 6
rra[4].xff = 5.0000000000e-01
rra[4].cdp_prep[0].value = 5.5253545695e-02
rra[4].cdp_prep[0].unknown_datapoints = 0
rra[5].cf = "MAX"
rra[5].rows = 600
rra[5].cur_row = 122
rra[5].pdp_per_row = 24
rra[5].xff = 5.0000000000e-01
rra[5].cdp_prep[0].value = 6.1702723498e-02
rra[5].cdp_prep[0].unknown_datapoints = 0
rra[6].cf = "MAX"
rra[6].rows = 600
rra[6].cur_row = 60
rra[6].pdp_per_row = 288
rra[6].xff = 5.0000000000e-01
rra[6].cdp_prep[0].value = 9.8553624547e-02
rra[6].cdp_prep[0].unknown_datapoints = 1

*Sample of the rrd data:*

Â Â Â <rra>
Â Â Â Â Â Â Â <cf> MAX </cf>
Â Â Â Â Â Â Â <pdp_per_row> 288 </pdp_per_row> 

Â Â Â Â Â Â Â <params>
Â Â Â Â Â Â Â <xff> 5.0000000000e-01 </xff>
Â Â Â Â Â Â Â </params>
Â Â Â Â Â Â Â <cdp_prep>
Â Â Â Â Â Â Â Â Â Â Â <ds>
Â Â Â Â Â Â Â Â Â Â Â <primary_value> 2.4599590045e-01 </primary_value>
Â Â Â Â Â Â Â Â Â Â Â <secondary_value> 1.5169713868e-02 </secondary_value>
Â Â Â Â Â Â Â Â Â Â Â <value> 9.8553624547e-02 </value>
Â Â Â Â Â Â Â Â Â Â Â <unknown_datapoints> 1 </unknown_datapoints>
Â Â Â Â Â Â Â Â Â Â Â </ds>
Â Â Â Â Â Â Â </cdp_prep>
Â Â Â Â Â Â Â <database>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> NaN </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> NaN </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> NaN </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> NaN </v></row>
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ...
Â Â Â Â Â Â Â Â Â Â Â  <row><v> NaN </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 1.5422079788e-01 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 1.2992281824e-01 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 6.5458858960e-02 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 6.5886740669e-02 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 1.6210659727e-01 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 2.4225769319e+00 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 1.9872074442e-01 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 9.8006705302e-02 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 6.6096604365e-02 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 4.3653869153e-01 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 4.9173219146e-01 </v></row>
Â Â Â Â Â Â Â Â Â Â Â  <row><v> 2.4599590045e-01 </v></row>
Â Â Â Â Â Â Â </database>
Â Â Â </rra>
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omeganon

2011-10-19 17:05:34 UTC

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omeganon [http://community.zenoss.org/people/omeganon] created the discussion

"Re: Question about graph scale and units"

To view the discussion, visit: http://community.zenoss.org/message/61995#61995

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I don't see any obvious reasons for it. With DERIVE, RRDtool is storing rates (objs/s); are you *sure* that you're really doing 1-200/s?

Note that your ds0 max is 100 so if you have any rates that are > 100/s, they will be logged as UNKNOWN --

ds[ds0].max = 1.0000000000e+02

--
Marc
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GOM

2011-10-19 20:10:57 UTC

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GOM [http://community.zenoss.org/people/GOM] created the discussion

"Re: Question about graph scale and units"

To view the discussion, visit: http://community.zenoss.org/message/62003#62003

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Weird. Yeah absolutely sure the rate is 1-200/m (minute, cycle time 60). This is happening with my other graphs which use the same method of data collection as well. They all look like:

foo OK datapoint 5683 | foo=5683;;;;

For instance the data here is also DERIVE and reflects a deviation per cycle of ~0-10, but it seems to be recorded as 0m -10m. I can get rid of the si unit with the format option, but the data the graph shows is still off... So still seeking clues.

About the ds[ds0].max, do you think I can change that on the fly or should I have to recreate from scratch?

Cheers.
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omeganon

2011-10-19 21:03:59 UTC

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omeganon [http://community.zenoss.org/people/omeganon] created the discussion

"Re: Question about graph scale and units"

To view the discussion, visit: http://community.zenoss.org/message/62004#62004

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No matter what your cycle time, RRDTool always stores all COUNTERS and DERIVES as units/second, not units/minute or units/arbitraryinterval. It knows the last value it received and the timestamp of that last entry. It uses those to convert your current input into a per second value. That's just how RRDTool works when dealing with rates.

If your delta between cycle times is 1, then RRDTool stores 0.01 (1/60s = 0.01).
If your delta between cycle times is 100, then RRDTool stores 1.7 (100/60s = 1.7).
If your delta between cycle times is 200, then RRDTool stores 3.3 (200/60s = 3.3).

What I think you're looking for is to add an RPN to the graph to muliply the values by 60 (60,*).
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GOM

2011-11-06 00:01:51 UTC

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