[Beowulf] building Infiniband 4x cluster questions
diep at xs4all.nl
Mon Nov 7 09:26:41 PST 2011
Thanks for the very clear explanation Gilad!
You beated with just 2 lines entire wiki and lots of other homepages
with endless of chatter :)
On Nov 7, 2011, at 6:19 PM, Gilad Shainer wrote:
>> hi John,
>> I had read already about subnet manager but i don't really
>> understand this,
>> except when it's only configuration tool.
>> I assume it's not something that's critical in terms of bandwidth,
>> it doesn't
>> need nonstop bandwidth from the machine & switch is it?
> The subnet management is just an agent in the fabric that give
> identifiers to the ports and set the routing in the fabric (in case
> of static routing). It will also discover new nodes once connected
> to the fabric, or nodes that went down (in the later case, it can
> modify the routing accordingly). The agent requires negligible
> network resources, so no need to worry. You can run the subnet
> management from a server (head node for example using OpenSM for
> example) or from one of the switches.
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