How to setting many origin server on TS

[kelu tang]

Hi,
    In one origin server, it work well.I have tested with the tools of
the 10000 number of simultaneous connections.Even the machine is not
very good.I add this in the remap.config file :
         map http://172.16.3.8/ http://www.a.cn/
         reverse_map http://www.a.cn/ http://172.16.3.8/

    Now, i have image server, static page server,video server like
"img1.a.cn, img2.a.cn, static1.a.cn, video.a.cn".
   How can set it?

   Thanks in advance.

Tang Road