[rrd-users] Little trouble with rrd_create_r

permalink · #1 (**permalink**) 06-13-2007

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Hello List,

I've written an application which collects bandwidth stats from a bunch of
switches and then takes those stats and is supposed to insert them into an
RRD for each switch port. I've been having some trouble both creating RRDs
and inserting data into them.

The errors I am getting when creating the RRDs is "expected 2 data source
readings (got 1) from 0:". I've got my code printing out the equivalent
`rrdtool create` command from the same arguments passed to the
`rrd_create_r` function and it prints out the following

rrdtool create /path/to/rrds/b4_switch_port_47.rrd --step 300
--start 1181726796 \

"DS:input:COUNTER:600:0:U" \

"DS:output:COUNTER:600:U:U" \

"RRA:AVERAGE:0.5:1:600" \

"RRA:LAST:0.5:1:600" \

"RRA:MAX:0.5:1:600" \

"RRA:AVERAGE:0.5:6:700" \

"RRA:LAST:0.5:6:700" \

"RRA:MAX:0.5:6:700" \

"RRA:AVERAGE:0.5:24:775" \

"RRA:LAST:0.5:24:775" \

"RRA:MAX:0.5:24:775" \

"RRA:AVERAGE:0.5:288:797" \

"RRA:LAST:0.5:288:797" \

"RRA:MAX:0.5:288:797"

<line breaks added for readability>

The function which is used to create the RRD is as follows

int

sc_rrd_create(const char *filename)

{

time_t start = time(NULL) - 600;

unsigned long step = 300;

int argc = 14;

char *argv[] = {

"DS:input:COUNTER:600:0:U",

"DS:output:COUNTER:600:U:U",

"RRA:AVERAGE:0.5:1:600",

"RRA:LAST:0.5:1:600",

"RRA:MAX:0.5:1:600",

"RRA:AVERAGE:0.5:6:700",

"RRA:LAST:0.5:6:700",

"RRA:MAX:0.5:6:700",

"RRA:AVERAGE:0.5:24:775",

"RRA:LAST:0.5:24:775",

"RRA:MAX:0.5:24:775",

"RRA:AVERAGE:0.5:288:797",

"RRA:LAST:0.5:288:797",

"RRA:MAX:0.5:288:797",

(char*)NULL

};

sc_replay_rrd_create(filename, step, start, argc, (const
char **)argv);

return rrd_create_r(filename, step, start, argc, (const char
**)argv);

}

The `sc_replay_rrd_create` function is what prints out the above `rrdtool
create` command. Out of all the switches I am working with and all their
ports, this function correctly creates the RRD for about 10 - 15% of them.
The rest have the "expected 2 data source readings (got 1) from 0:" error.

Am I missing something glaringly obvious in my RRD definition which is
causing this problem?

Linking against librrd and using `-O0 -g` when compiling. RRDtool version
1.2.23.

Regards,

Geoff Garside

Open Hosting Ltd

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<body lang=3DEN-GB link=3Dblue vlink=3Dpurple>

<div class=3DSection1>

Hello List,<o:p></o:p>

I’ve written an application which collects =
bandwidth
stats from a bunch of switches and then takes those stats and is =
supposed to
insert them into an RRD for each switch port. I’ve been having =
some
trouble both creating RRDs and inserting data into them. =
<o:p></o:p>

<o:p> </o:p>

The errors I am getting when creating the RRDs is
"expected 2 data source readings (got 1) from 0:". I’ve =
got my
code printing out the equivalent `rrdtool create` command from the same
arguments passed to the `rrd_create_r` function and it prints out the =
following<o:p></o:p>

<o:p> </o:p>

          =
   rrdtool
create /path/to/rrds/b4_switch_port_47.rrd --step 300 --start 1181726796 =
\<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  "DS:input:COUNTER:600:0:U"  &n bsp; =
\<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  "DS:output:COUNTER:600:U:U" =
\<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:AVERAGE:0.5:1:600"  &nbsp ;   &nbs=
p;             =
\<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:LAST:0.5:1:600"   &n bsp;   &=
nbsp;       \<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:MAX:0.5:1:600"   &nb sp;   &n=
bsp;        =
\<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:AVERAGE:0.5:6:700"  &nbsp ;   &nbs=
p;             =
\<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:LAST:0.5:6:700"   &n bsp;   &=
nbsp;       \<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:MAX:0.5:6:700"   &nb sp;   &n=
bsp;        =
\<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:AVERAGE:0.5:24:775"  &nbs p;   =
\<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:LAST:0.5:24:775"   & nbsp;   =
       \<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:MAX:0.5:24:775"   &n bsp;   &=
nbsp;      \<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  "RRA:AVERAGE:0.5:288:797"  &nb sp; =
\<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  =
"RRA:LAST:0.5:288:797"       &nbsp=
;        & nbsp;   =
     \<o:p></o:p>

          =
        &n bsp;   &=
nbsp;  "RRA:MAX:0.5:288:797"<o:p></o:p>

<o:p> </o:p>

<line breaks added for =
readability><o:p></o:p>

<o:p> </o:p>

The function which is used to create the RRD is as =
follows<o:p></o:p>

<o:p> </o:p>

          =
   int<o:p></o:p>

          =
   sc_rrd_create(const
char *filename)<o:p></o:p>

          =
   {<o:p></o:p>

          =
      
time_t start =3D time(NULL) - 600;<o:p></o:p>

          =
      
unsigned long step =3D 300;<o:p></o:p>

<o:p> </o:p>

          =
      
int argc =3D 14;<o:p></o:p>

          =
      
char *argv[] =3D {<o:p></o:p>

          =
          
"DS:input:COUNTER:600:0:U",<o:p></o:p>

          =
          
"DS:output:COUNTER:600:U:U",<o:p></o:p>

          =
          
"RRA:AVERAGE:0.5:1:600",<o:p></o:p>

          =
          
"RRA:LAST:0.5:1:600",<o:p></o:p>

          =
          
"RRA:MAX:0.5:1:600",<o:p></o:p>

          =
          
"RRA:AVERAGE:0.5:6:700",<o:p></o:p>

          =
          
"RRA:LAST:0.5:6:700",<o:p></o:p>

          =
          
"RRA:MAX:0.5:6:700",<o:p></o:p>

          =
          
"RRA:AVERAGE:0.5:24:775",<o:p></o:p>

          =
          
"RRA:LAST:0.5:24:775",<o:p></o:p>

          =
          
"RRA:MAX:0.5:24:775",<o:p></o:p>

          =
          
"RRA:AVERAGE:0.5:288:797",<o:p></o:p>

          =
          
"RRA:LAST:0.5:288:797",<o:p></o:p>

          =
          
"RRA:MAX:0.5:288:797",<o:p></o:p>

          =
          
(char*)NULL<o:p></o:p>

          =
      
};<o:p></o:p>

<o:p> </o:p>

          =
      
sc_replay_rrd_create(filename, step, start, argc, (const char =
**)argv);<o:p></o:p>

          =
      
return rrd_create_r(filename, step, start, argc, (const char =
**)argv);<o:p></o:p>

          =
   }<o:p></o:p>

<o:p> </o:p>

The `sc_replay_rrd_create` function is what prints =
out the
above `rrdtool create` command. Out of all the switches I am working =
with and
all their ports, this function correctly creates the RRD for about 10 - =
15% of
them. The rest have the "expected 2 data source readings (got 1) =
from
0:" error.<o:p></o:p>

<o:p> </o:p>

Am I missing something glaringly obvious in my RRD
definition which is causing this problem?<o:p></o:p>

<o:p> </o:p>

Linking against librrd and using `-O0 -g` when =
compiling.
RRDtool version 1.2.23.<o:p></o:p>

<o:p> </o:p>

Regards,<o:p></o:p>

Geoff Garside<o:p></o:p>

 <o:p></o:p>

Open Hosting Ltd<o:p></o:p>

<o:p> </o:p>

</div>

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