FM / parameters

/sys/module/md_mod/parameters

Name	Size	Mode	Actions
create_on_open	4096	0600	edit dl rm
new_array	4096	0200	edit dl rm
start_dirty_degraded	4096	0644	edit dl rm
start_ro	4096	0600	edit dl rm

Edit: /sys/module/md_mod/parameters/create_on_open (4096B)