The Intel Modular Server is a complete server system designed to simplify a complex fail-safe IT environment. One characteristic is that it provides virtual disks
and two storage controllers
for redundancy. Systems that use those virtual disks have two physical paths to access their disk(s). (NOTE: This is not
a RAID solution against disk defects, but safeguards against a breakdown of a storage controller!)
When you install and boot Linux on such a machine you will see both paths...