How many fire extinguishers do you have in your data center? Currently I have only one (and I hope it is more than enough!) but I think that probably isn't wise. What is your recommendation?
I have three, but how many you have is going to largely depend on how many servers you have and how big the room is that you are using. You want them to be easily accessible, and near the areas where you might need them.
I recommend three or so for most server rooms but as ABurton mentioned it depends on how many servers you have and how big the server room is. I suggest, if you can fit it into your budget, getting a more high tech fire protection system. Some are listed in this thread.