Before revision:  We show lower bounds 3, 11/3 and 4 (> 3.44948), 4+\sqrt{73}{3} (>4.18133) and 13{3} (>4.33333) } on the competitive ratio when the numbers of servers are 3, 4 and 5, respectively.
After revision:  We show lower bounds 1+ \sqrt{6 (> 3.44948), 4+\sqrt{73}{3} (>4.18133) and 13{3} (>4.33333) } on the competitive ratio when the numbers of servers are 3, 4 and 5, respectively.