To change the host name in Solaris 10 just change these files
/etc/hosts
/etc/nodename
/etc/nostname.<interface>
/etc/inet/ipnodes    (There is some debate about this file)
Use dumpadm to update
/etc/dumpadm.conf
Reboot

NOTE The following hosts files are no longer used in Solaris 10.
/etc/net/ticlts/hosts
/etc/net/ticots/hosts
/etc/net/ticotsord/hosts

On Solaris 10 it is possible to dynamically re-read the sd.conf configuration file via the use of the update_drv command.
# update_drv -vf sd
Cannot unload module: sd Will be unloaded upon reboot. Forcing update of sd.conf. sd.conf updated in the kernel. This prevents the need to reboot the server in order for changes to the sd.conf [...]

Newer Sun kit has a feature where when you un-configure an internal drive for removal a blue light comes on indicating the device is ready for removal. This is quite useful when you are performing break fix to a remote location, so that the engineers know which drive to pull.
This works when removing tape drives [...]