Identifying disks with serial number

[Graham Todd]

Hello all,

Quick question on disk serial numbers. Besides manually geom_label-ling
disks by serial number is there an automagic way for geom to present
serial numbers to the system/devfs?  I'm not using ZFS or anything but
I've got to the point where anything that helps with juggling disks would
be nice.

I noticed a newish DragonflyBSD feature that does this. They "label" disks
with serial numbers, devfs seems to see them and then you can use
convenience aliases in /etc/devtab to make the serial number ID
referenceable in /etc/fstab). See:

 http://leaf.dragonflybsd.org/mailarchive/users/2009-08/msg00149.html

Something similar was discussed in freebsd-arch thread long ago (by the
usual suspects (-: ):

 http://lists.freebsd.org/pipermail/freebsd-arch/2006-June/005344.html

Is there a documented way to "autolabel" disks by serial number in FreeBSD?

Thanks for all replies.