LVM Tutorial how to create a Physical Volume (PV), Volume Group (vg), and a Logical Volume (LV) within it

# first we need a physical volume which we use the pvcreate tool to create

# I create mine on /dev/sdb3
pvcreate /dev/sdb3
  dev_is_mpath: failed to get device for 8:19
  Physical volume "/dev/sdb3" successfully created

# pvdisplay shows the newly created volume
  "/dev/sdb3" is a new physical volume of "1.35 TiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb3
  VG Name              
  PV Size               1.35 TiB
  Allocatable           NO
  PE Size               0  
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               gpMwTX-JNA7-oTXT-YoCJ-RsKF-ceJd-3hin8w

# we need to create a new volume group within the physical volume of /dev/sdb3
# below I call it "kvmvm" on /dev/sdb3
vgcreate kvmvm /dev/sdb3
  Volume group "kvmvm" successfully created

# we can see below with vgdisplay that it has been created
  --- Volume group ---
  VG Name               kvmvm
  System ID            
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1.35 TiB
  PE Size               4.00 MiB
  Total PE              352925
  Alloc PE / Size       0 / 0  
  Free  PE / Size       352925 / 1.35 TiB
  VG UUID               2d42cr-3f92-wF25-l288-JThZ-GGGQ-ttYvI6

# now that I have a volume group I need to create a logical volume (basically a mini-usable/resizeable partition within LVM's PV /dev/sdb3 on the VG kvmvm

# create a 60GB partition on the VG kvmvm and call it "kvmuserrdp"  
lvcreate -L 60G kvmvm -n kvmuserrdp
  Logical volume "kvmuserrdp" created

# shows the newly created lv (logical volume) which is accessible like a normal drive under /dev/kvmvm/kvmuserrdp

  --- Logical volume ---
  LV Path                /dev/kvmvm/kvmuserrdp
  LV Name                kvmuserrdp
  VG Name                kvmvm
  LV UUID                HQhCr0-S2WS-DJEn-eHcc-axYn-uA8M-6bnYro
  LV Write Access        read/write
  LV Creation host, time testbox, 2014-03-26 16:52:56 +0800
  LV Status              available
  # open                 0
  LV Size                60.00 GiB
  Current LE             15360
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0


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