Is there some magic to get the system to swap to a vnode device?
I can get it to mount if I fudge an /etc/disktab entry and run
newfs on it, but swapon refuses to see it:

wheel { ~ } # vnconfig -e /dev/vnd0b /var/swapfile swap
swapon: Invalid argument
wheel { ~ } # swapon /dev/vnd0b
swapon: /dev/vnd0b: device not configured
wheel { ~ } # mount /dev/vnd0b /mnt
wheel { ~ } # df
Filesystem  1K-blocks     Used    Avail Capacity  Mounted on
/dev/sd0a      967325   751008   119584    86%    /
kernfs              1        1        0   100%    /kern
/dev/vnd0b       9533        1     9055     0%    /mnt
wheel { ~ } # disklabel -r vnd0
# /dev/rvnd0d:
type: unknown
disk: swapfile
label: 
flags:
bytes/sector: 512
sectors/track: 20
tracks/cylinder: 10
sectors/cylinder: 200
cylinders: 100
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0           # milliseconds
track-to-track seek: 0  # milliseconds
drivedata: 0 

4 partitions:
#        size   offset    fstype   [fsize bsize   cpg]
  b:    19997        2      swap                        # (Cyl.    0*- 99*)
  c:    20000        0    unused        0     0         # (Cyl.    0 - 99)
  d:    20000        0    unused        0     0         # (Cyl.    0 - 99)
wheel { ~ } #

   This is under NetBSD/i386 1.0_Beta. Thanks.

                                      Gary D. Duzan
                         Humble Practitioner of the Computer Arts