Missing energy commissioning in CMS and prospects for supersymmetry searches with 1 $\mathrm{fb^{-1}}$

Supersymmetry may give rise to striking events that could be discovered early in LHC running. We discuss the prospects of discovery of search strategies based on the generic event signatures of high jet multiplicity and large missing transverse momentum. An important aspect of such searches is the commissioning of search variables with the first LHC data which we present in detail