  Results are presented for the low-lying spectrum of D and D_s mesons
calculated in lattice QCD using 2+1 flavor Clover-Wilson configurations made
available by the PACS-CS collaboration. For the heavy quark, the Fermilab
method is employed. The main focus is S- and P-wave states of charmed and
charmed-strange mesons, where previous lattice QCD results have been mostly
from quenched calculations. In addition to the ground states, some excited
states are extracted. To check the method, calculations of the charmonium
spectrum are also carried out. For charmonium, the low-lying spectrum agrees
favorably with experiment. For heavy-strange and heavy-light systems
substantial differences in comparison to experiment values remain for some
states.
