FM-200 (HFC-227ea) is still available and a good solution for DataCenter protection. There are other alternatives as well. Novec 1230 (FK-5-1-2) is a clean agent gas that requires a lower concentration for extinguishment.
There are inert gases available also. Inergen (IG-541) or Agonite (IG-55) are the more "popular" of the inert gas agents. They utilize naturally occurring gases to extinguish the fire. The downside is they require much higher concentrations for extinguishment, thus you need more space to house the tanks. Also, pressure venting is a concern using these gases.
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