Manage Physical Volumes2023/07/18

	This is the basic operation of managing Physical Volumes. It needs to create LVM type partition first.
[1]	Create Physical Volume.

root@dlp:~#

pvcreate /dev/sdb1

Physical volume "/dev/sdb1" successfully created

# to create with volume size explicitly, set like follows

root@dlp:~#

pvcreate --setphysicalvolumesize 50G /dev/sdb1

Physical volume "/dev/sdb1" successfully created

[2]	Display Physical Volumes.

root@dlp:~#

pvdisplay /dev/sdb1

  "/dev/sdb1" is a new physical volume of "<160.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb1
  VG Name
  PV Size               <160.00 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               evsDRS-76aa-wv6m-w4pi-4EfJ-bF2W-unjVv0

[3]	Change size of Physical Volume.

# change to 50G

root@dlp:~#

pvresize --setphysicalvolumesize 50G /dev/sdb1

/dev/sdb1: Requested size 50.00 GiB is less than real size <160.00 GiB. Proceed?  [y/n]: y
  WARNING: /dev/sdb1: Pretending size is 104857600 not 335542272 sectors.
  Physical volume "/dev/sdb1" changed
  1 physical volume(s) resized or updated / 0 physical volume(s) not resized

root@dlp:~#

pvdisplay /dev/sdb1

  "/dev/sdb1" is a new physical volume of "50.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb1
  VG Name
  PV Size               50.00 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               evsDRS-76aa-wv6m-w4pi-4EfJ-bF2W-unjVv0

[4]	Display reports of Physical Volumes.

root@dlp:~#

pvs /dev/sdb1

  PV         VG Fmt  Attr PSize  PFree
  /dev/sdb1     lvm2 ---  50.00g 50.00g

[5]	Scan Physical Volumes.

root@dlp:~#

pvscan

  PV /dev/vda5   VG debian-vg       lvm2 [[<79.52 GiB / 0    free]
  PV /dev/sdb1                      lvm2 [50.00 GiB]
  Total: 2 [[<129.52 GiB] / in use: 1 [[<79.52 GiB] / in no VG: 1 [50.00 GiB]

[6]	Delete Physical Volume.

root@dlp:~#

pvremove /dev/sdb1

  Labels on physical volume "/dev/sdb1" successfully wiped.

root@dlp:~#

pvdisplay /dev/sdb1

  Failed to find physical volume "/dev/sdb1".

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