[ALUG] How to use pvcreate?

[Chris G]

OK, so I have cleared everything off my /dev/sda (except, presumably,
the MBR) and all is well still, Fedora still boots and my Windows
guest virtual machine is still working.

How do I now set up /dev/sda using LVM?  As I understand it the
sequence is to create a Physical Volume using pvcreate, then a Logical
Group that uses the Physical Volumes I have created and then I create
a logical volume in the Logical Group.

The problem is that I don't understand how you tell pvcreate what disk
it is to use.  The 'synopsis' on the pvcreate man page says:-

SYNOPSIS
   pvcreate   [-d|--debug]   [-f[f]|--force   [--force]] [-y|--yes]  [-h|--help]  [-t|--test]
   [-v|--verbose] [--labelsector]  [-M|--metadatatypetype] [--metadatacopies#copies]  [--meta-
   datasizesize]  [--restorefilefile] [--setphysicalvolumesizesize] [--version] [-Z|--zeroy/n]
   PhysicalVolume [PhysicalVolume...]

Which doesn't seem to give much clue as to what disk it uses,
PhysicalVolume is (as I understand it) the name that pvcreate gives to
the chunk of disk you want to use, so what disk does it use?

-- 
Chris Green