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The h1.4xlarge instances are meant to be 10gbps capable but when I check in windows it shows a 1gbps. There seems to be no config i can set on the eni, subnet or vpc to adjust this.

Anyone have a clue? Windows 2008rs SQL Server 2008rs

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Check it. Really.

The shown network speed in a VM may mean nothing. Hyper-V for example does the same - every virtual network adapter is a 1gbit adapter. Regardless how fast the physical network is. BUT: It can run at higher speeds than 1gbit. Just the "emulated" hardware never changes.

AMazon may be the same - they SHOW 1gbit but you can transfer faster. Try it out.

  • Thx Tom, We are experiencing what looks like transport errors, possibly driven by contention. the speed appears, as you say, very good around 100mb /sec for a copy. – Paddy Carroll Jan 2 '14 at 21:17
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Adding on to TomTom's response, this also depends on the following condition: "Instances launched into the same cluster placement group are placed into a non-blocking 10 Gigabit ethernet network"

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