We report on a study of 2+1 flavor lattice QCD with the $O(a)$-improved Wilson quarks on a $16^3times 32$ lattice at the lattice spacing $1/aapprox 2$GeV employing Lueschers domain-decomposed HMC(LDDHMC) algorithm. This is dedicated to a preliminary study for the PACS-CS project which plans to complete the Wilson-clover $N_f=2+1$ program lowering the up-down quark masses close to the physical values as much as possible. We focus on three issues: (i) how light quark masses we can reach with LDDHMC, (ii) efficiency of the algorithm compared with the conventional HMC, (iii) parameter choice for the production runs on PACS-CS.
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