geom stripe/concat metadata suggestion

Would it be a good idea to store the device name, or something similar,
in the metadata?

For example, if I have a disk divided like this:

 |--------------ad0--------------|
 |-------------ad0s1-------------|
 |----ad0s1g-----|-----ad0s1d----|

The metadata is written into the last sector, so when the stripe/concat
classes are tasting they can't work out whether it belongs to ad0s1d,
ad0s1 or ad0.

I've had problems creating stripes and concats with this configuration.

Regards
Sam.