HDR_L2ONLY_SIZE
bzero(hdr, HDR_L2ONLY_SIZE);
arc_space_consume(HDR_L2ONLY_SIZE, ARC_SPACE_L2HDRS);
arc_space_return(HDR_L2ONLY_SIZE, ARC_SPACE_L2HDRS);
HDR_L2ONLY_SIZE, 0, hdr_l2only_cons, hdr_l2only_dest, hdr_recl,
bcopy(hdr, nhdr, HDR_L2ONLY_SIZE);
arc_adapt(log_entries * HDR_L2ONLY_SIZE, arc_l2c_only);