Manage Phisical Volumes2016/09/12

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

root@dlp:~#

pvcreate /dev/sdb1

Physical volume "/dev/sdb1" successfully created

# specify like follows if you'd like to specify volume size

root@dlp:~#

pvcreate --setphysicalvolumesize 50G /dev/sdb1

Physical volume "/dev/sdb1" successfully created

[2]	Display Phisical Volumes.

root@dlp:~#

pvdisplay /dev/sdb1

  PV Name               /dev/sdb1
  VG Name
  PV Size               80.00 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               PJnOPg-9KwO-5xJz-Z8tn-9zP7-VKn5-ADrGzy

[3]	Change size of Phisical Volume.

# change to 50G

root@dlp:~#

pvresize --setphysicalvolumesize 50G /dev/sdb1

Physical volume "/dev/sdb1" changed
1 physical volume(s) resized / 0 physical volume(s) not resized
root@dlp:~#

pvdisplay /dev/sdb1

  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               PJnOPg-9KwO-5xJz-Z8tn-9zP7-VKn5-ADrGzy

[4]	Display reports of Phisical Volumes.

root@dlp:~#

pvs /dev/sdb1

  PV         VG   Fmt  Attr PSize  PFree
  /dev/sdb1       lvm2 ---  80.00g 80.00g

[5]	Scan Phisical Volumes.

root@dlp:~#

pvscan

  PV /dev/vda2   VG centos   lvm2 [49.51 GiB / 0    free]
  PV /dev/sdb1               lvm2 [80.00 GiB]
  Total: 2 [129.51 GiB] / in use: 1 [49.51 GiB] / in no VG: 1 [80.00 GiB]

[6]	Delete Phisical 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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