today we tested yesterday's entry. I'm not going over the md stuff, as there are good guides for md all over the place, but restoring the LVM mirroring is a bit tricky.
once you reboot after removing the disk (as in our test) to make things work, you must
vgreduce --remove-missing vg_name
then
vgchange -ay vg_name
this will get you back up and running.
Then, once you have the disk replaced, to restore redundancy:
pvcreate /dev/newdiskpartition
vgextend vg_name pv_name
lvconvert -m1 /dev/vg_name/lv_name
check status by typing 'lvs' and looking at the 'copy percent' log
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