[openib-general] Specifying subnet prefix to OpenSM?

[Hal Rosenstock]

Hi Galen,

On Tue, 2007-01-02 at 17:49, Galen Shipman wrote:
> I have 2 test machines, each with two HCAs. One HCA on each node is  
> plugged into a switch, the other two HCAs are connected back to back.
> The goal is to get two different subnets, one for each pair of HCAs.  
> Currently I am using "opensm --guid" in order to run OpenSM on the  
> each HCA/Port 0. The problem is that I also want these two subnets to  
> appear distinct in some fashion. I am querying the subnet via:
> 
>      ibv_query_gid(hca->ib_dev_context, port_num, 0, &gid);
>      subnet = ntoh64(gid.global.subnet_prefix);
> 
> 
> Not sure if this is the correct thing to do, but this is what I am  
> doing ;-).
> 
> So, is there a way to specify the subnet prefix to OpenSM?

Yes, by supplying subnet_prefix in the opensm.opts file.

If both opensms run on the same machine, you will need 2 different
OSM_CACHE_DIRs to have different options.

>  Is there  
> some other method that I can use to determine that the subnets are  
> distinct?

Not that I'm aware of.

-- Hal

> 
> Thanks,
> 
> Galen
> 
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