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This patch is not fully tested and leaves some related bugs unfixed. Intended behaviour of the code now: pe_start in the lvm2 format PV label header is set only by pvcreate (or vgconvert -M2) and then preserved in *all* operations thereafter. In some specialist cases, after the PV is added to a VG, the pe_start field in the VG metadata may hold a different value and if so, it overrides the other one for as long as the PV is in such a VG. Currently, the field storing the size of the data area in the PV label header always holds 0. As it only has meaning in the context of a volume group, it is calculated whenever the PV is added to a VG (and can be derived from extent_size and pe_count in the VG metadata).
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