NFS section defaults to "kernel" which is a text entry

[mitcHELLspawn]

Wondering if rather than having a text entry that defaults to "kernel" for the kernel NFS server, could it instead be a drop down where you choose either "kernel" or "ganesha".

Once you choose "kernel" , active-active should then be hidden and active-passive is the only choice.

reason: If someone is deploying this for the first time, they may not even know they have another choice besides kernel as there is no obvious other choice.