- fwrite(rrd->rrd_value, sizeof(rrd_value_t), value_count, fh);
+ fwrite(rrd->rrd_value +
+ (rra_offset + num_rows - 1 - cur_row) * ds_cnt,
+ sizeof(rrd_value_t), (cur_row + 1) * ds_cnt, fh);
+
+ fwrite(rrd->rrd_value + rra_offset * ds_cnt,
+ sizeof(rrd_value_t), (num_rows - 1 - cur_row) * ds_cnt, fh);
+
+ rra_offset += num_rows;
+ }