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Metadata
LVM2 metadata is small and stored as ASCII.
By default each PV in a VG holds one copy of the metadata. All copies have to be identical before the metadata can be used.
Choose 0, 1 or 2 copies with pvcreate --metadatacopies. You can't change this later.
For large VGs, plan where to put your metadata areas - most of your PVs should have 0 copies to avoid slowing down the tools. But if you intend to split the VG in future, every VG needs at least one metadata copy.