From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hal Rosenstock Subject: Re: Dual star topology Date: Wed, 24 Jul 2013 14:04:20 -0400 Message-ID: <51F01724.7010504@dev.mellanox.co.il> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Gandalf Corvotempesta Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org Hi Gandalf, On 7/24/2013 11:20 AM, Gandalf Corvotempesta wrote: > Hi to all > i'm probably OT but I don't know where to ask > I'm searching for some advice creating a dual-star topology to get > full path redundancy. > I have one dual-port DDR card on each server and two switches. > I'll connect one port to each switch, but should I also interconnect > both switches like in a standard ethernet network ? The most fully redundant model would be to _not_ interconnect the 2 switches so it's 2 IB subnets rather than a single subnet. This means you need at least 1 SM on each subnet (with different subnet prefix) but you might want more if you're worried about some SM failing and not having an SM on that subnet. -- Hal -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html