|write and transfer are not the same. Not all data transferred is written to the drive.|
4000mbps is not speed but bandwidth available for data transfers.
You need a managed switch that supports one of the teaming protocols.
Adapter teaming software is provided by the manufacturer of the nics.
Your drive should be mirrored [raid1] minimally. Depending on raid level not only do you get drive failover but an increase ins read/write speed from that of a standalone drive.
Example of Oxymoron:
Person who is pro life and anti sex education.
Education is key to prevention. Prevent conception you prevent abortion.
Abstinence training clearly isn't working.