query on mirroring

[sylvan dacounha]

Dear All,
   
  I am curently using REDHAT ES4 server as my mail and DNS and been workin fine ..
  im have no much experince
   
  the machine is p4 3.0 GHZ with one  120 gb IDE HDD
   
  i am planing to install a new HDD to mirror the existing one .
   
  appreciate if some  one can tell me the steps or any good site which explain in deatail the steps of mirroring the HDD 
   
  as a security i will do a backup b4 i do the actuall mirroring
   
   
  Thnaks and appreciate
   
   
  regards
   
  simon
   
   
   

 
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