[rrd-users] Re: RRD Graph

[Saravanan Suthanthiram]

Alex,
Now I clearly understand the Data Source Type. I have modified the RRD 
database to fix the graph issue but still I have a spike in my graph. I 
will briefly explain what I did.

My data source definition is DS:ds1:DERIVE:600:0:U and it has the 
following value

car.rrd 
1100062670:12118790:325592037:1665197:15724083:102546716:1415811:2756520:11086662700:78789085:0:0:0
car.rrd 1100063257:3617:61997:681:3527:2522:14:82:380648:66261:0:0:0

Based on the above value graph has big spikes because it have negative 
value. But we don't want to see this spike since we used to reboot the 
server regularly and for each reboot this spike will be in graph. So we 
thought in order to avoid spike in the graph we introduce few UNKNOWN 
values in the RRD database as below.

car.rrd 
1100062670:12118790:325592037:1665197:15724083:102546716:1415811:2756520:11086662700:78789085:0:0:0
car.rrd 1100062860::::::::::0:0:0
car.rrd 1100062920::::::::::0:0:0
car.rrd 1100062980::::::::::0:0:0
car.rrd 1100063040::::::::::0:0:0
car.rrd 1100063100::::::::::0:0:0
car.rrd 1100063257:3617:61997:681:3527:2522:14:82:380648:66261:0:0:0

But still we can see the spike in the graph. Can you please let me know 
how RRD works on this.

Thanks
Saravanan




Alex van den Bogaerdt <alex at ergens.op.het.net> 
Sent by: rrd-users-bounce at list.ee.ethz.ch
23/11/2004 02:03

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Subject
[rrd-users] Re: RRD Graph






On Mon, Nov 22, 2004 at 10:55:04AM -0500, Sunil Modi (IT) wrote:

> DERIVE ABSOLUTE and COUNTER are reates of change.  GAUGE will give the 
actual number.  From your previuos post it seemed that you wanted to 
compare to previous values, but now it seems you just want the actual 
number.  Use GAUGE for the actual number.

All numbers in an RRA are rates.

Derive, absolute, counter and gauge determine how to compute such a rate.

GAUGE    -> It already is a rate. Just copy the rate.
COUNTER  -> Look at the difference between last time and now
ABSOLUTE -> A counter that starts from zero when you read it
DERIVE   -> A counter that can also go back

GAUGE will NOT give you the actual number.

Rates are still being normalized before they are stored as a PDP.
This means the rate may be different from what you gave to RRDtool.

GAUGE will NOT give you the actual number.

A number of PDPs will be subject to consolidation before they are
stored as a CDP.  This means the rate in the RRA may be different
from what you gave to RRDtool.

GAUGE will NOT give you the actual number.

Alex
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