Ethernet interconnection is preferable than Fiber Channel not only for the FC price tag, and due to the ease to manage and features it delivers.
Main concerns why to go with Ethernet are following:
- Flash: Fast Storage Needs Fast Networking.
Modern Ethernet supports speeds of 100Gb/s per link, with latencies of
several microseconds, and combined with the hardware-accelerated iSER
block protocol, it’s perfect for supporting maximum performance on
non-volatile memory (NVM), whether today’s flash or tomorrow’s
next-gen solid state storage.
- Modern Ethernet Outperforms Fibre Channel
Today’s Ethernet runs at 25, 40, 50, or 100Gb/s speeds. Meanwhile,
Fibre Channel is still transitioning to 16Gb/s technology and thinking
about 32Gb/s in 2016, which is slower than what Ethernet was
supporting 3 years ago.
- iSER Turbocharges iSCSI
iSER adds RDMA support to iSCSI. This lets the network cards offload
the iSCSI protocol and network transport to the NIC, supporting even
higher performance and lower latency with low CPU utilization.
For more reasons should read the quoted article: http://www.mellanox.com/blog/2015/12/top-7-reasons-why-fibre-channel-is-doomed/
That being said, the options to boost the throughput are Link Aggregation Control Protocol and Multipath I/O. If your concern is redundancy and failover, you can use any of those technologies to achieve the resiliency. For cases when the performance is required, concern to go with MPIO since it allows to use more links thus more throughput to be achieved. For a deep dive in the comparison check the original post: https://www.starwindsoftware.com/blog/lacp-vs-mpio-on-windows-platform-which-one-is-better-in-terms-of-redundancy-and-speed-in-this-case-2.