Assuming the mount of /dev/md? as /raid/folder entry in fstab ends in "1 2" the above would look like:
/raid/folder /folder auto bind 1 3
So it gets mounted *after* the raid device is mounted.
I don't remember if filesystems are mounted in the order listed in fstab, or sorted to produce proper order, but both of the fields at the end should be zero for a bind mount. You never dump a directory, and you never fsck it either:
/raid/folder /folder auto bind 0 0
Listed last in fstab, it should still be mounted in the proper order.
