I've been looking into the problem and it looks like the problem is with the
headnode. i've looked into ganglia and there's just the client node. apparently
ganglia doesn't recognizes the headnode as a node (strange, usually the problem
is with recognizing the clients). During installation I remember setting one
option for the headnode to be an execution node also. could it be something to
do with this? where can I check it?
i've set the debugging levels on both files to 10 but there is no new output on
ganglia.err? where is the extra debugging info?
thanks in adv,
FG
Milo wrote:
> Since the head node seems to be receiving data fine from the compute node, I
> don't think the switch not passing multicast packets is the problem. Try
> turning up the debugging level for gmetad on the head node, and see if the
> output gives any clues, if nothing else, it will tell you if and from what
> nodes gmetad is receiving data packets from. To turn on debugging edit your
> /etc/gmetad.conf file, near the top you should see a variable 'debug_level'
> which is set to 0 by default. Setting it to above 0 will keep gmetad in the
> foreground when it is started and spit out debug messages to standard
> output. You can also do this for the gmond service as well by editing the
> /etc/gmond.conf file and turning on debugging in the globals{} section at
> the top.
> Hopefully that will at least give you an idea of where to start looking for
> the problem, let us know.
>
> -Milo
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Michael
> Edwards
> Sent: Thursday, June 28, 2007 12:50 PM
> To: oscar-users@lists.sourceforge.net; Bernard Li
> Subject: Re: [Oscar-users] install on FC5: error in Ganglia
>
> We have been getting a fair number of people having problems with
> ganglia tests failing lately. I have not been able to reproduce the
> problem myself, so I am not sure where the issue is.
>
> Sometimes it breaks because of problems with the /etc/hosts file.
>
> Also, what kind of switch are you using? Ganglia likes to (needs to?
> not sure) use multicast, which is not supported on all switches.
>
> On 6/28/07, Filipe Garrett <[EMAIL PROTECTED]> wrote:
>> Hi all,
>>
>> I've managed to pass the other problem. after installing FC5 I updated
>> everything (with 'yum update') and it was under that configuration that
>> the installation script was unable to determine the machine's
> architecture.
>> I've fresh installed FC5 (1 headnode + 1 client) and everything went
>> smooth. I got to the test phase and every test passed BUT Ganglia!!! In
>> the ganglia.err file (pasted below) the client (molevol1.ub.edu) looks
>> OK and so the problem seems to be with the headnode (molevol.ub.edu)
>> that does not show up in CLUSTER HOSTS. Since it is a small cluster I've
>> also set the headnode to an execution host (could this be the problem?).
>> I've also checked for gmond and it is running in all machines.
>>
>> thanks in adv,
>> FG
>>
>>
>>
>>
>>
>>
>>
>>
>> Client nodes: molevol1.ub.edu
>> Match pattern: molevol.ub.edu|molevol1.ub.edu
>> Number of hosts matched: 1
>> Gstat output:
>> CLUSTER INFORMATION
>> Name: MolEvol
>> Hosts: 1
>> Gexec Hosts: 0
>> Dead Hosts: 0
>> Localtime: Thu Jun 28 17:26:44 2007
>>
>> CLUSTER HOSTS
>> Hostname LOAD CPU
>> Gexec
>> CPUs (Procs/Total) [ 1, 5, 15min] [ User, Nice, System,
>> Idle, Wio]
>>
>> molevol1.ub.edu
>> 2 ( 1/ 66) [ 0.00, 0.00, 0.00] [ 2.1, 0.0, 0.8,
>> 97.1, 0.1] OFF
>>
>> The number of nodes expected is different from the number of nodes
> detected.
>> Check to see if gmond is running on all your nodes and make sure that you
>> are not having any network issues.
>>
>>
>>
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