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Advantages of host-based shadowing? (RAID)

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The Question is:

 
What are the advantages for using Volume Shadowing as software RAID ?

The Answer is :

 
  Primarily, the permitted separation distance between the volumes.
  Host-based shadow sets can span storage controllers and OpenVMS
  host systems and (in OpenVMS Cluster configurations) even hundreds
  of miles...

  
     
     answer written or last revised on ( 16-FEB-2000 )
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