Fw: [ofa-general] Re: [query] Multi path discovery in openSM

[Eitan Zahavi]

> > OpenSM will always use min-hop paths (no matter what 
> routing algorithm 
> > except maybe for LASH).
> > If you use the default algorithms OpenSM will tend to 
> spread traffic 
> > such that if you have used LMC=1 (2 LIDs per port) The two 
> paths going 
> > to LID0 and LID1 will go through different systems or if 
> not possible 
> > through different nodes.
> >
> 
> Using the same example you have mentioned, what happens if 
> LMC=1and there are 2 paths (say P1, P2  and P2 is costlier 
> than P1) between two nodes (say N1, N2).
> Will the openSM still configure two different paths for LID0 and LID1?
I am not sure I follow "costlier" but if you mean that P1 is 3 hops and
P2 is 4 hops than P2 "does not exist" from
OpenSM standpoint.
> 
> -Mahesh
> 
> > EZ
>