Thanks for your reply - hopefully this will clarify the missing bits of
information.
> -----Original Message-----
>
> Your email is missing some relevant information. gmond
> doesn't store metrics into RRD files, it only makes the
> metric information available via XML. gmetad is the process
> that gets these metrics (from gmond
> nodes) and stores them on RRD files on disk. You seem to be
> debugging under the assumption that your problem is that the
> collector gmond isn't getting the metrics from the other
> gmond, but you haven't given us information to indicate that
> you've verified that.
To clarify, I will call our regular collecter 'BoxA' and the host with the disk
metrics 'WinBox'. BoxA is a Linux host running Ganglia 3.0.7 and WinBox is a
windows host running Ganglia 3.0.7
When I setup WinBox as my cluster collector node in gmetad, all of the metrics
that I expect to be present are there and RRD files are created for them.
They are only missing if I configure WinBox to send to BoxA and setup BoxA as
my collecter in gmetad.conf
Working config:
WinBox gmond.conf
udp_send_channel {
host = WinBox
port = 8649
}
gmetad.conf
data_source "My Cluster" WinBox.mydomain.com
Failing config:
WinBox gmond.conf
udp_send_channel {
host = BoxA
port = 8649
}
BoxA gmond.conf
udp_send_channel {
host = BoxA
port = 8649
}
gmetad.conf
data_source "My Cluster" BoxA.mydomain.com
> So:
> - Can you look at the XML from your collector node (tcp port 8649)
> and check if it's actually missing the metrics?
The metrics are there, and appear in gmetad when using WinBox as my collector.
When WinBox is configured to send to itself (see working configuration above),
telnetting to 8469 on the server shows those metrics are present.
When I set BoxA to be the collecter and configure WinBox to send to that, the
metrics are NOT present when I telnet to BoxA 8649.
> - Is your gmetad polling the correct collector nodes?
Yes, it is - in both scenarios, WinBox appears appears in the collection in
Gmetad
At this point, it looks as if the data is missing when it is sent to BoxA, the
Linux collector. At this point, I cannot see the metrics in the XML output any
more, so it makes sense that it never arrives at the gmetad host.
On this basis, where do I go to investigate this further ?
On BoxA, sbin/gmond -m does not include any of the metrics that I am collecting
on my Windows box and wish to appear in my cluster - is this relevant ? Do
these metrics have to be supported by this gmond to be collected? If so, how
can I configure them, given that my earlier attempt to include them caused
gmond to fail with the following message:
Unable to collect metric 'phys_disk_time' on this platform. Exiting.
Thanks in advance for any assistance that anyone can give :)
--
Wayne Pascoe
RBS Global Banking & Markets
Office: +44 20 3361 9571 | Mobile: +44 7799 707450
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