Currently looking at waterless alternative fire suppression systems for the server room and our records room.
Currently looking at FM-200 systems (chemical agent made by Great Lakes Chemical that acts similarly to Halon but doesn't damage the ozone layer) and FE-25 (chemical agent similar to FM-200 and Halon made by Dupont and Fike).
These systems are pretty cool as they put out the fire much faster than the water based sprinkler systems do and require almost no cleanup. The sprinkler systems put in buildings are pretty much there just to protect the building and occupants. They take way too long to activate to protect against anything else and of course the water is destructive to any electrical equipment and paper files not to mention the cleanup takes a long time.
FM-200 and FE-25 are odorless, colorless gases that are nontoxic to humans so there's no problem if the system discharges while people are in the room, unlike a CO2 system. One condition that has to be met in order to use these chemicals is that the room must be relatively air tight. The agents only work if they are able to stay in the area of a fire. Interestingly enough, even if you put one of these systems in a room you cannot take out the existing sprinkler systems, however the fire detectors used by the replacement systems will discharge in case of a fire in about 1 minute 30 seconds after ignition, whereas it takes the sprinkler systems something like 8-10 minutes before the air surrounding the sprinkler is hot enough to burst the pellet which allows the water to flow out.
Not sure about cost yet, still waiting to get quotes back from vendors.