For the most part, I would agree with Bernard -- set it up initially
using multicast as that should work right out of the box.
That said, I have converted my entire installation to use unicast. We
had no end of problems getting multicast to work on our network and in
our initial testing managed to crash one of our edge switches
(Foundry). If your networking team isn't on board it will probably be a
lot easier to run with unicast for the long run.
Bernard Li wrote:
> Hi Arne:
>
> On Thu, Nov 18, 2010 at 3:02 AM, Arne Brutschy <[email protected]>
> wrote:
>
>
>> I am using Ganglia for a cluster of ~70 nodes - single monitor, single,
>> flat network. What's the recommended type of operation for this, unicast
>> or multicast? What are the (dis)advantages of each mode?
>>
>
> I would start simple and use the default settings (multicast), it is
> fairly easy to set up.
>
> Network administrators have mentioned that multicast is "chatty" and
> causes jitter. If the workload on your cluster is sensitive to that,
> you might consider switching to unicast. I am sure Google and the
> mail archives is a great source of knowledge regarding these.
>
> I just added this to the FAQs -- hope this helps. Comments/thoughts
> on the subject welcome!
>
> https://sourceforge.net/apps/trac/ganglia/wiki/FAQ
>
> Thanks,
>
> Bernard
>
--
Dan Rich <[email protected]> | http://www.employees.org/~drich/
| "Step up to red alert!" "Are you sure, sir?
| It means changing the bulb in the sign..."
| - Red Dwarf (BBC)
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