[openib-general] Re: Re: Re: Subment Management

[abhijitngpune]

hi,


>Are you using Voltaire SM ? It has richer capabilities here than OpenSM.
>Someone in support should be able to explain how to use the various
>routing/pathing algorithms supported by VSM. Who is your support person
>?



   Could you plz suggest me any person from Support Team who can help me in this problem?  


Abhijeet 

"Hal Rosenstock" wrote:



Hi Abhi,

On Thu, 2005-04-14 at 07:26, abhijitngpune wrote:
> Hi,
> 
> Thanks,
> 
> Regd. Fabric manager : It was just a theoritical concern. I
> was doubtful regd voltaire SM.
> 
> Regd. Subnet topology:
> 
> Let me explain the scenario. I want to create
> (logical) topology like this :
> 
> N
> 
> / | \
> 
> N ---- | ---- N
> 
> / \ | / \ 
> 
> N --- N --- N
> 
> N: node (hope u understand the topology)
> 
> How to create such kind of virtual subnet topology? 

This is where LMC > 0 comes in. It allows for multiple paths to be
utilized between nodes.

> Do u think it is possible over star connected nodes(Interconnected
> topology is star, becoz we have one voltaire switch to which all 78
> nodes are connected )?

Yes.

> How subnet management will help me to get this topology? What should
> be my basic step in this scenario?. 

Are you using Voltaire SM ? It has richer capabilities here than OpenSM.
Someone in support should be able to explain how to use the various
routing/pathing algorithms supported by VSM. Who is your support person
?

What host stack are you running on the end nodes ? (They appear to be HP
nodes). Also, what applications/ULPs/protocols are you intending on
running in this topology ?

Thanks.

-- Hal

> Abhi,
> 
> CML
> 
> 
> 
> 
> 
> "Hal Rosenstock" wrote:
> 
> 
> 
> Hi Abhi,
> 
> On Thu, 2005-04-14 at 04:40, abhijitngpune wrote:
> > Hi, My lab has recently purchased Voltaire 9288 - 288 Port
> Infiniband
> > Cluster Switch and HP cluster with 78 nodes. I have some
> doubts
> > related to subnet management. 1. Does the fabric manager
> work on
> > Graph(non fat tree) topologies?
> 
> As Shahar has explained in previous emails, it does. Is this a
> theoretical concern or are you having a real world problem ?
> 
> > 2. Since the interconnect topology is star how can i get
> logical
> > topology which is graph (containing cycles)? 
> 
> The SM uses one of its routing/pathing policies to determine
> the
> topology. Which SM are you using ? Are you using Voltaire's SM
> or 
> OpenSM ?
> 
> > How can i create subnet with (logical) topology on the top
> of the
> > underlying star topology? 
> 
> The SM automatically does this based on the routing/pathing
> policy. Note
> that the routing/pathing policy is beyo n! d the IB spec (and
> left to the
> SM vendor/implementor).
> 
> > 3. Can i install Mellanox gold s/w for infiniband? 
> 
> The short answer is yes. You can run Mellanox Gold on the end
> nodes,
> OpenIB, or the Voltaire host stack on the end nodes. It
> depends on what
> applications/ULPs you are trying to run. For things in common,
> not all
> interop experiments have been run if you are trying for a
> heterogeneous
> environment (a mix of those end node stacks).
> 
> > 4. Does voltiare has its own subnet simulator? Abhi CML
> 
> Shahar will need to answer this one.
> 
> -- Hal
> > 
> >
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