You can remove an NVM subsystem or a port.
Restrictions on removing an NVM subsystem port
You can remove an NVM subsystem port added to the NVM subsystem to release the assignment of the channel port on the storage system. If host I/O operations are running by using a channel port assigned to the target NVM subsystem port as a route, the NVM subsystem port cannot be removed. In this case, stop the I/O operations from the host first, and then remove the NVM subsystem port.
Restrictions on removing an NVM subsystem
You can remove an unnecessary NVM subsystem from the storage system. If you remove the NVM subsystem, the NVM subsystem port and the host NQN registration that are set for the target NVM subsystem are also removed.