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Recommend a nice managed Top Of Rack switch for Linux Computer Cluster (but it has to be cheap!) [closed]

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http://serverfault.com – I work at an industrial research lab, and we have a research group that's building up a Linux-based compute cluster. The have about 46 nodes so far, with more to come. They came to us a few months ago looking for a suggestion for a 48-port managed gigabit switch to network the nodes together. We are a Cisco shop for the core networking stuff, but since they are budget-constrained, I got them a Dell 5548 switch which came in a bit under $1,000. Unfortunately this switch has been nothing but problems (not sure what the root cause is, but after a few week of running the nodes on it, it slows way (HowTos)