[Beowulf] Anyone know the LinkAggregation(Trunking) on a switch?

Zhang Hui spacetiller at 163.com
Tue Sep 6 19:03:07 PDT 2005

>What is the exact definition of a failed machine.
>- turned off
>- kernel paniced, halted but still on
>- above certain limit load ?
Either the machine is turned off or the application is down.
Thx.I have found that the 2-layer switch can't detect the death of the machine.

	Now that, if "1" is down, I had to let the machine "2" tell the "switch" via snmp.
The question is, how do i tell the "switch" to shutdown the link to the machine "1"?
>Do you use heartbeat to detect those and STONITH in order to turn off a
>failed machine?
Yes, the heartbeat.It's also the "application" refered above.
>Zhang Hui wrote:
>>	I have got a problem with the trunking failover on a switch.  
>>	I have implemented the multi-machine Trunking(one link per machine).The packets can be distributed between the links/machines and be at last forwarded to a real server via the IPVS(by Zhang Wensong),like this:
>> _
>>| |       |------|     ________
>>|.|__/\___|  1   |_____|      |
>>| |  ||   |______|     | real |
>>| |  ||trunk           |      |
>>| |  ||   |------|     |server|
>>|.|__||___|  2   |_____|      |
>>|_|  \/   |______|     |______|
>>	And when one link(to one machine) is down, the connection will be transfered to another link/machine, and to "server" at last,session kept.
>>	The problem is, when, for example, "1" is down, but the link to "1" is still up(judge from the LED for "1" on the switch).So the "switch" won't think "1" is down, and distribute packets to "1" as usual.Therefore the connection is down.
>>	Can't the switch sense the death of a machine,intrinsically? Or something wrone with the configuration of Trunking in the "switch"?
>>	By the way, the "switch" is a 3com SS3300TM 16986A one.
>>	Can anyone help me? Great appreciation to any reply.
>>        Zhang Hui
>>        spacetiller at 163.com
>>          2005-09-02
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>Michael Will
>Penguin Computing Corp.
>Sales Engineer
>415-954-2899 fx
>mwill at penguincomputing.com 
        Zhang Hui
        spacetiller at 163.com

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