  We present a lattice QCD calculation of the parameters of the $\rho$ meson
decay. The study is carried out on spatially asymmetric boxes using
nHYP-smeared clover fermions with two mass-degenerate quark flavors. Our
calculations are carried out at a pion mass $m_\pi=304(2)$ MeV on the set of
lattices $V=24^2\times \eta 24\times48$ with $\eta=1.0,1.25$, and 2.0 with
lattice spacing $a=0.1255(7)$ fm. The resonance mass $m_\rho=827(3)(5)$ MeV and
coupling constant $g_{\rho\pi\pi}=6.67(42)$ are calculate using the P-wave
scattering phase shifts. We construct a 2$\times$2 correlation matrix to
extract the energy of the scattering states and compute the phase shifts using
the finite volume formula. By varying the degree of asymmetry, we are able to
compute a set of phase shifts that are evenly distributed throughout the
spectral region where the $\rho$ decays.
