Network design with blade servers and storage.

I am creating a design of one blade server chassis and storage in small colo cage.  Blade chassis have network switches built-in.  
10GB ports Im planning to connect to the storage and 1GB to the clients.  

Do I still need an additional core switches for external network?  How is it normally done?  Please advice.

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andyalderSaggar maker's framemakerCommented:
Assuming you have a normal blade switch you can plug routers and clients directly into it if it has enough pors; the exception to that is HP Virtual Connect which isn't a switch and has to be connectd to external switches. So it normally just depends on how many external ports the switches have.

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For a new hw, I would go with Infiniband switches and HBA.
Some blades and servers are coming with integrated 40Gbs (QDR IB) ports that allows for all purpose services.
Some switches offers both IB and 10Gbe ports.

IB performance is really more than all alternatives and it cost less.
Tiras25Author Commented:
Got it assigning points soon.
What was your final choice then ? IB or 10Gbe ?
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