Nick Havard wrote:
> "Axel Neumann" <Axel.Neumann@epost.de> wrote in message
> news:bvu49e$vfr7i$1@ID-55633.news.uni-berlin.de...
>
>>"Nick Havard" <nick@nickhavardxyz.com> wrote:
>>
>>>Hi
>>>
>>>I have a small two node Sun Cluster 3 setup which is using two cross
>
> over
>
>>>cables for interconnects. I beleive the cross over cables are causing
>
> some
>
>>>issues and wish to change it to use switches/hubs that sit in the
>
> middle.
>
>>>For this I thik there are two options as below.
>>>* Use two small hubs, one for each interconnect
>>>* Use a single small switch for all interconnect cables
>>>
>>>My question is will the later option work, or will the cluster detect
>>>incorrect traffic on the interconnects (i.e. have confusion between each
>>>interconnect "channel") and give me more problems than it would solve,
>
> or
>
>>>would the switch sort itself out and isolate the network traffic on each
>>>interconnect. The second option is my preferred as it requires only a
>>
>>single
>>
>>>power socket and one device. As this is only a play cluster I'm not too
>>>concerned about single point of failure etc.
>>>
>>>Thanks for your help.
>>>
>>>Regards
>>>
>>>Nick
>>>nick@nickhavardxyz.com
>>>
>>>P.S. Remove xyz to reply
>>>
>>
>>Hi,
>>
>>If the cluster is covered by a support contract from Sun you have to use
>
> two
>
>>switches. A single switch solution is not supported.
>>
>>HTH,
>>
>>Axel Neumann
>>
>>
>
> Hi
>
> No the cluster definitely isn't under support. It's a small cluster of an
> Ultra-5 and Ultra-10 with some Multipacks for shared storage that I use for
> "working" and learning on at home. Thus I'm not bothered about having
> component reliability etc.
>
> One of the problems I seem to have is that is I take one node down etc, it
> causes problems at the other node (sometimes crashing it), which I beleive
> is due to the loss of a cluster interconnect at the interface. Therefore by
> using a switch or hub I would eliminate this as the node that remains, the
> interconnect interface would still beleive it was connected to a network.
>
> If I could use a single switch for all four interconnect interfaces, it
> would suit me as IO have far to many power sockets in use already. However
> I'm not sure if a switch would isolate the interconnect traffic between the
> two interconnect channels in a satisfacory manner, or would the cluster
> detect inappropriate traffic on each interconnect (as it would with a single
> hub) and have additional problems.
>
> Regards
>
> Nick
> nick@nickhavardxyz.com
>
> P.S. Remove xyz to reply
>
>


You shouldn't really have any problems with the crossover cables.
Adding switches isn't likely to fix anything.

When you say that you bring the other node down, how are you bringing
it down and how are you brining it back up again. If you repeatedly
do this the wrong way (init 0 would be an example of the wrong way)
you can cause a confusion in the cluster. You need to use the set of
SC commands when working with the nodes.


Elias