Mirroring boot disk

We're running a network using SCO Unix version 3.5.4.  Our main Hard Drive (SCSI disk) is near the end of its reliable lifetime.  I need to mirror the contents of this disk to a new SCSI hard disk.  Then, I'd need to switch the disks so that the new disk becomes the boot disk.  In effect, I shall be mirroring the contents of the old disk with the new, and replacing the old with the new.

What are the necessary commands to do this, and how do I configure the new HD for simultaneous operation with the old in order to accomplish the actual mirroring phase?

I am assuming that once this is accomplished I will be able to simply switch the SCSI ID's of the drives and the system will function as before.
keeshAsked:
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lockhartCommented:
All you need is dd. If your drives were /dev/sd-old and /dev/sd-new, your dd command would be:

dd if=/dev/sd-old of=/dev/sd-new

This assumes that your drive's block size is 512 bytes on both drives. Read the dd manpage to see how to use the ibs (input block size) and obs (output block size) flags that will allow you to have different block sizes on your old and new drives.

Once you've done this command (it'll take awhile), you should be able to switch scsi id's and go.

Mike
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