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I was recently setting up a Jumpstart server and when I ran the setup_install_server script in Solaris_9/Tools I was getting:

ERROR: /cdrom/sol_9_sparc/s0/Solaris_9/Tools/Boot is not a valid install boot image
Check that boot image is valid, or use [-t]
to specify a valid boot image.

The solution is to restart the vold service which can be done with a simple:

# /etc/init.d/volmgt stop
# /etc/init.d/volmgt start

Thanks to Nicholas for pointing this out to me.