How to rebuild while preserving an LVM disk

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I have an ancient (FC3) Fedora that I want to move to FC8. I figure it might be cleanest to just rebuild it rather that upgrading (if that's even possible, it's so old). I can blow everything away except one thing. Separate from my OS disk, I have to SATA drives built into a raid-0 with md, and then an lvm physical volume group built on that. I need to keep that, and I don't have enough room anywhere else to backup and restore it.

If I unplug the raid drives, and rebuild my system, how can I hook them back up? Is the configuration info describing the md array, and the lvm groups stored on my os drive, which I'm blowing away. How can I save and/or recreate it once I get the main system back up?

Also, I don't know if there have been major changes to md or lvm (or xfs for that matter, since the logical volume is formatted as xfs). Will I have any problems using drives set up with a relatively old version of this software.

Thanks for your advice.


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