Win 2003 drive mirror help

After some information/advice, using Win 2003 is it possible to add mirrored drive without affecting the state of the server? Meaning it’s a production server now with 50 or so web sites/mail etc when I add the second drive and use Windows built-in mirror software it won’t have an effect on the state of the server and stuff the sites/mail

Or should this only be done on a new server before setting up as a web server.

Thanks in advance

 

 

 

 

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