Hi James,
not sure about 2.4, but 3.5 and above has option 14 in the vxdiskadm
menu which sounds right up your alley.
failing that, the vxassist move option might do the same.
So, at a guess, something like:
vxassist -g tooldwnld-dg move tooldwnld \!d012 disk24
(please dont use that
following the top posting..
to use vxsd mv, you must first make the subdisk on the destination by
hand using vxmake.
something like vxmake -g tooldwnld-dg sd disk24-01 dm_name=disk24
dm_offset=0 len = 17678493
vxsd -o rm mv d012-01 disk24-01
(this last operation will take a long time)
Check