Sift flour and sugar into large bowl.
Bring 1 cup butter, 1/4 cup cocoa and water to a boil in saucepan. Pour over flour mixture; mix well. Add buttermilk, baking soda, cinnamon, 1 teaspoon vanilla, eggs and salt and mix well.
Pour into greased and floured 10x15-inch cake pan. Bake at 400 degrees for 30 to 35 minutes or until wooden pick inserted near center comes out clean.
For the frosting, bring 1/2 cup butter, 1/4 cup cocoa, milk and 1 teaspoon vanilla to a boil in saucepan; remove from heat. Add confectioners' sugar gradually, mixing until spreading consistency. Stir in pecans. Spread over hot cake.
Cake may be baked in 9x13 inch cake pan for 40 to 50 mintues.
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