Hi all:
I don't have much to comment on at this stage except it is something
worthwhile to pursue.
Do other users have any thoughts/comments on this?
Thanks,
Bernard
On Friday, July 20, 2012, Peter Phaal wrote:
> I agree, the performance of the network fabric is a critical component
> of cluster performance and it would be great to figure out how to best
> include the data in Ganglia.
>
> A possible starting point would be to define <SWITCH> elements in the
> XML structure exported by gmond. A switch would contain multiple
> <INTERFACE> objects each of which contain standard SNMP MIB-II metrics
> (ifInOctets, ifOutOctets, ifInErrors, ifOutErrors, ifInDiscards,
> ifOutDiscards etc). The problem is that this wouldn't be backward
> compatible with tools accessing the XML interface. Another option
> would be to have the network data appear as a separate XML document,
> accessed on a different TCP port.
>
> The next challenge would be to figure out how to include this type of
> information in the Ganglia UI - rolled up errors and discards for the
> fabric would be a natural fit for the top level view, but to drill
> down, Ganglia would need to deal with the concept of multiple resource
> pools in the cluster (networking and computation). Extending the
> notion further, a storage resource pool might also be interesting. For
> virtual server pools, pooling the VMs and the hypervisors would also
> be useful.
>
> Peter
>
> On Fri, Jul 20, 2012 at 9:31 AM, Andreas Pflug
> <pgad...@pse-consulting.de <javascript:;>> wrote:
> > Well,
> >
> > for examining the overall health of a cluster the network fabric appears
> > equally important to me...
> > There seems no OS software for this combined?
> >
> > Regards
> > Andreas
> >
> >
> > Am 20.07.12 17:50, schrieb Peter Phaal:
> >> The sFlow standard defines a wide range of metrics from switches,
> >> servers and applications. Each device only exports the metrics that
> >> are relevant to its normal operation, so switches will report network
> >> metrics, servers will report cpu, memory, disk statistics and
> >> applications will report response times, URLs etc.
> >>
> >> http://blog.sflow.com/2010/08/sflow-host-structures.html
> >>
> >> The Dell switch is exporting sFlow metrics relating to its operation
> >> as a switch. Since it isn't a server, it won't export the server
> >> metrics that gmond is looking for. Ganglia is designed to monitor
> >> clusters of servers and it expects to receive a core set of server
> >> metrics from each member of the cluster and will ignore sFlow metrics
> >> that don't relate to that function.
> >>
> >> There are a number of other sFlow analysis tools listed on sFlow.org
> >> that are focused on sFlow switch metrics:
> >>
> >> http://sflow.org/products/collectors.php
> >>
> >> The following article describes some things to consider when
> >> evaluating sFlow analyzers for monitoring switches:
> >>
> >> http://blog.sflow.com/2009/05/choosing-sflow-analyzer.html
> >>
> >> Peter
> >>
> >> On Fri, Jul 20, 2012 at 7:46 AM, Andreas Pflug
> >> <pgad...@pse-consulting.de <javascript:;>> wrote:
> >>> I've configured some Dell switches (e.g. 6224, with recent 3.3.3.3
> >>> firmware) to emit SFLOW packets, and I see them happily arriving at my
> >>> gmond machine, but the switches aren't recognized.
> >>>
> >>> Digging into the sources, I found that the switch under investigation
> >>> never sends blocks tagged as SFLOW_COUNTERBLOCK_HOST,_HID only type 0
> >>> and 1. Consequently, all packets are dropped.
> >>>
> >>> Is this a Dell problem of incompletely implemented SFLOW, or is it a
> >>> gmond problem?
> >>>
> >>> Regards
> >>> Andreas
> >>>
> >>>
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