Looks like the problem was with multicastig. I configured the gmonds to 
send to a number of hosts with the host directive (so its unicasting)
and then pointed gmetad at these for its data source and all works fine 
now:

http://hyades.maths.qmul.ac.uk

many thanks for everyone replies.

Regards

John

On Sat, 26 May 2007, Michael Edwards wrote:

> Check the port 8649 on the head node from a compute node.
>
> On 5/26/07, John O'Loughlin <[EMAIL PROTECTED]> wrote:
>>
>>
>> Tried a few things...
>>
>> when I telnet to port 8649 on one of the compute nodes and look at thew
>> output I can see that each node has no information about any of the other
>> nodes. Also, looking at tcpdump -i eth0 udp and port 8649 on a (few of)
>> node I can only see the node sending but no incoming traffic.
>>
>> Not sure where to go from here.
>>
>> John
>>
>> On Sat, 26 May 2007, Milo wrote:
>>
>>> No Problem, try the simplest thing first, rerun the post-install script for
>>> ganglia. It will write a new config file with the right settings:
>>> (If you unpacked the Oscar files somewhere than the default, edit the path)
>>> # export OSCAR_PACKAGE_HOME=/opt/oscar/packages/ganglia/
>>> # cd /opt/oscar/packages/ganglia/scripts
>>> # ./post-install
>>>
>>> -Milo
>>>
>>> -----Original Message-----
>>> From: [EMAIL PROTECTED]
>>> [mailto:[EMAIL PROTECTED] On Behalf Of John
>>> O'Loughlin
>>> Sent: Saturday, May 26, 2007 6:40 AM
>>> To: oscar-users@lists.sourceforge.net
>>> Subject: Re: [Oscar-users] Ganglia
>>>
>>>
>>>> Next I'd check the /etc/gmond.conf configuration file and see if it got
>>>> configured correctly when Oscar was installed.
>>>
>>> And this is where I fall down I'm afraid, I've read the documentation and
>>> seems ok but I've no previous experience with ganglia, it just worked fine
>>> last time I installed oscar.
>>>
>>> John
>>>
>>>> -Milo
>>>>
>>>> -----Original Message-----
>>>> From: [EMAIL PROTECTED]
>>>> [mailto:[EMAIL PROTECTED] On Behalf Of John
>>>> O'Loughlin
>>>> Sent: Friday, May 25, 2007 9:18 PM
>>>> To: oscar-users@lists.sourceforge.net
>>>> Subject: Re: [Oscar-users] Ganglia
>>>>
>>>>
>>>> Just installed oscar on a 40 node cluster and everything went
>>>> well...except for ganglia.
>>>>
>>>> It seems to think all more my nodes are dead, which I guess is not
>>>> surprising since
>>>>
>>>> tcpdump -i eth1 udp and port 8649
>>>>
>>>> shows nothing at all!!
>>>>
>>>> Any ideas?
>>>>
>>>> John
>>>>
>>>>
>>>>
>>>>
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