> What about existing systems that have RH already installed -- is it
> possible to add RAID afterwards if I just get the extra disks? If it
> possible, has anyone documented this procoess

It's possible but messy:

    create the RAID system on the new disk(s)
    configure the RAID system to run in degraded mode (one disk short)
    copy data from the existing disk to the RAID system
    boot the RAID system (from a floppy if necessary)
    repartition the old disk and add it to the RAID array

See the Software-RAID HOWTO and the Boot+Root+Raid+LILO mini HOWTO 
for examples.


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