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<br /> Check that boot image is valid, or use [-t]<br /> 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<br /> # /etc/init.d/volmgt start

Thanks to Nicholas for pointing this out to me.