We have had a Halon fire suppression system for many, many years in our small server room. It is checked and serviced twice a year. Recently we moved around some electrical panels and now the alarm panel power cutoff switch is no longer connected. I think one benefit of a Halon system (over a sprinkler system) is that you can save your computer equipment, but only if you cut the power the moment before the Halon goes off, to keep the halon out of the insides of the equipment.
I have been told that it will cost more than a few bucks to correct the cutoff circuit, and I should consider whether or not to continue to use the halon system. Any advice? Are there better systems now, ones that will not require an electrical shutoff to equipment?