FC3T2 update disaster

[Neal D. Becker]

I just tried update FC2 -> FC3T2 and pretty much destroyed my FC2.

I have 2 parallel IDE drives, hda,hdb

I have 2 SATA drives, sda,sdb.  The SATA are setup for LVM2, and were
working on FC2.

I tried to update to FC3T2.  I did not want to mess up my working install on
SATA, so I copied the file system to hdb2 (ext3).

I went to update.  It correctly found 2 installations - the LVM one and the
one on hdb2.  I selected hdb2.

It proceeded to write to SATA.

No errors were produced, but the system would not boot.  Just a grub prompt.

I tried to rescue, using grub-install.  Only managed to get a grub menu, but
then messages about not being able to find any volume groups.  No clue why
that was.

Finally, I gave up and did a re-install over the SATA.  Now it's working
again.