What's the reasonable time to mirror a hard disk?

["Yuwen Dai" <daiyuwen@hotmail.com>]

Hi, All

I have two identical hard disk linked with one cable.  The capacity of each 
disk is 40G.  I want to have the second disk be the mirror of the first disk 
by using this command:

 dd if=/dev/hda of=/dev/hdb bs=32k

Nearly 2 hours passed, dd still hadn't finished.  I had to press 'Ctrl-C' to 
stop it.  Is this the right way to mirror a disk?  Or is there some better 
way to do this?  Thanks in advance.

Best regards,
Dai Yuwen



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