[rrd-developers] [Ganglia-developers] Integrating rrdcached with Ganglia

Daniel.Pocock at barclayscapital.com Daniel.Pocock at barclayscapital.com
Tue Sep 30 12:18:44 CEST 2008

> >>
> >> - RHEL5
> >> - 64 bit
> >> - APR 1.2.7

now using the trunk snapshot for 30/09/2008

> >> - Ganglia 3.1.0
> >>
> >> gmetad stores the data and IO levels are definitely better.
> >>

I deleted the rrd files and started again, just monitoring a single
server (gmond on the same server as gmetad)

I get lots of errors like this, and gaps in my graphs:

Sep 30 11:05:42 servername rrdcached[18002]: queue_thread_main:
rrd_update_r (/.../rrds/unspecified/servername/disk_total.rrd) failed
with status -1. (/.../rrds/unspecified/servername/disk_total.rrd:
illegal attempt to update using time 1222768885 when last update time is
1222768885 (minimum one second step))

When I enable more hosts, I get the same type of problem on a larger
scale.  It seems to affect some hosts more than others.  The data
collected for the local host seems to be worse than the data from some
other hosts.

Checking the RRD files with `rrdtool info', I confirm that the step =
10.  The gmetad data source is polled every 5 seconds and the RRA
configuration I am testing is:

RRAs "RRA:AVERAGE:0.5:1:120960" "RRA:AVERAGE:0.5:12:86400"
"RRA:AVERAGE:0.5:720:12720" "RRA:MAX:0.5:1:120960"
"RRA:MAX:0.5:12:86400" "RRA:MAX:0.5:720:12720"




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