Matt wrote:
I have a 500GB Sata drive about 15% used I would like to make an exact
copy of too another Sata 500GB drive as a spare.  That way if
something happens to the one in service I can plug in the spare
quickly and restore one of the weekly backups without reinstalling the
entire OS and all the little tweaks of setup on this mail/web server.

How do I do this?  That is make an exact bootable copy of a linux
drive.  Its running Centos 4.6 if that matters.


brute force approach...

   dd if=/dev/sda of=/dev/sdb bs=16384

that will copy the whole physical drive. I would do this in single user mode (init 1) for best results, as any changes to the file system while a copy is in progress will be inconsistent


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