The RAW partition specified has an existing file system on it. This filesystem is the / or /usr partition. If the SERVER writes to it, it will most likely crash the whole operating system.
Disallow access to this raw partition.
Have user specify another RAW partition that is not the / or /usr. It may be possible that this is not the actual / or /usr partition of the boot disk. Check, using the Solaris format() command, if your partition name tag is labeled incorrectly as / or /usr.