I was a little overzealous with the application of --noudevsync btw, only vgchange accepts that option. Proper version:
SUBSYSTEM=="block", ACTION=="add|change", ENV{ID_FS_TYPE}=="lvm*|LVM*", \ RUN+="watershed sh -c '/sbin/lvm vgscan; /sbin/lvm vgchange --noudevsync -a y'"
I was a little overzealous with the application of --noudevsync btw, only vgchange accepts that option. Proper version:
SUBSYSTEM=="block", ACTION= ="add|change" , ENV{ID_ FS_TYPE} =="lvm* |LVM*", \
RUN+="watershed sh -c '/sbin/lvm vgscan; /sbin/lvm vgchange --noudevsync -a y'"