Remove a disk from an LVM volume group
Move data off an LVM physical volume with pvmove, then vgreduce and pvremove before you detach the disk, in the order that keeps a mounted filesystem alive.
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GPT vs MBR partition tables on a server
Why servers use GPT, what the protective MBR in sector zero is for, how many partitions you get, and how to fix the backup header after a volume resize.