loader.conf variables for vinum

[FreeBSD Daemon]

Dear list,
 
I am using 4.10R and want to set up a mirrored / using vinum.
 
I am confused by the note in section 17.9.1 of the handbook stating that
the following paragraphs only apply to 5.x and refer to 17.9.5 for 4.x
configuration.
 
Do I have to set just vinum_load, vinum.drives, and vinum.root in 4.x?
Or do I have to set vinum.autoload, too?
 
TIA
 
Zheyu