pvck checks LVM metadata on PVs.

Use the --dump option to extract metadata from PVs for debugging.
With dump, set --pvmetadatacopies 2 to extract metadata from a
second metadata area at the end of the device. Use the --file
option to save the raw metadata to a specified file. (The raw
metadata is not usable with vgcfgbackup and vgcfgrestore.)