vgextend adds one or more PVs to a VG. This increases the space available
for LVs in the VG.

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).

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.