Converting a non-RAID server to software RAID-1?

[jabr at gapps.blu.org (John Abreau)]

I have a server with a single 80gb SATA disk in it, and a
second drive bay that's currently empty. I'd like to convert
it to RAID-1 and expand the disk size. The current 80gb
drive is configured with lvm1; the OS is RHEL 3.8.

Is it possible to do this cleanly without reinstalling the
whole system?

I'm thinking something like the following might work:

* Set up the new disk as a set of failed RAID-1 volumes
* dd the partitions from the old disk to the corresponding
  failed RAID-1 partitions on the new disk
* Remove the old disk and reboot, to test that the system
  can boot and run with just the new disk
* Add a second new disk and "rebuild" the failed RAID-1
  volumes

Does this make sense?  Has anyone else done this
successfully?


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