When you create an NVMe namespace, you can associate this with a nonvolatile memory (NVM) subsystem. The subsystem includes one or more NVMe controllers, namespaces, NVM subsystem ports, an NVM storage medium and an interface between the controlller and the NVM storage medium.
The subsystem name is case sensitive. It must contain 1-64 characters and special characters are allowed.
The host OS type that the subsystem is being created on.
The host NVMe qualification name attached to the controller. This column can be a comma separated value as there can be one to many hosts attached to a subsystem.