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The host shows a bond of 2Gbps, but the CentOS guest only has 100Mbps according to dd. Using ethtool the only information is that the link exists (which I gather is correct for a guest VM). Xen tools are installed. Where should I start looking?

Host is Xen Server 6.5.0 and guest is CentOS 6.7 kernel 2.6.32

This is an Ethernet connection to a SAN, if that makes any difference.

Rick DeBay
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    Typically, you use `iperf` to measure network bandwidth. Give this a try and make sure the problem isn't introduced between the network stack and the disk. – Aaron Copley Jan 18 '18 at 21:38

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