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vgextend adds one or more PVs to a VG. This increases the space available
for LVs in the VG.
.P
Also, PVs that have gone missing and then returned, e.g. due to a
transient device failure, can be added back to the VG without
re-initializing them (see --restoremissing).
.P
If the specified PVs have not yet been initialized with pvcreate, vgextend
will initialize them. In this case pvcreate options can be used, e.g.
--labelsector, --metadatasize, --metadataignore,
--pvmetadatacopies, --dataalignment, --dataalignmentoffset.