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LVM

LVM contains following layers

* Physical Volumes
* Volume Groups
* Logial Volumes

lvg

lvols

Display Physical Volumes

pvdisplay command is used to display Physical Volumes.

root@server2:~# pvdisplay
  --- Physical volume ---
  PV Name               /dev/md4
  VG Name               pve
  PV Size               1.80 TiB / not usable 3.94 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              470906
  Free PE               1025
  Allocated PE          469881
  PV UUID               h1kshf-do9O-y3jn-eVs3-Rl4V-WLeQ-aSYd9h
   
root@server2:~# 

Display Logical Volume Groups

vgdisplay command is used to display Volume Groups.

root@server2:~# vgdisplay
  --- Volume group ---
  VG Name               pve
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1.80 TiB
  PE Size               4.00 MiB
  Total PE              470906
  Alloc PE / Size       469881 / 1.79 TiB
  Free  PE / Size       1025 / 4.00 GiB
  VG UUID               mGJc2S-HWVj-kj5q-Dau6-h7XZ-X4sR-Afkgod
   
root@server2:~# 

Display Logical Volumes (lvdisplay)

root@server2:~# lvdisplay
  --- Logical volume ---
  LV Path                /dev/pve/data
  LV Name                data
  VG Name                pve
  LV UUID                nE67m1-2onL-R7AO-48m3-nU8j-pXWd-3QNj5Q
  LV Write Access        read/write
  LV Creation host, time server2.hostonnet.com, 2015-12-12 16:18:13 -0500
  LV Status              available
  # open                 1
  LV Size                93.65 GiB
  Current LE             23975
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0
   
  --- Logical volume ---
  LV Path                /dev/pve/vm
  LV Name                vm
  VG Name                pve
  LV UUID                Wtcyaq-xzvT-TXtj-Iuk2-2dWP-9o0P-Wbb4Zv
  LV Write Access        read/write
  LV Creation host, time server2.hostonnet.com, 2015-12-12 16:18:13 -0500
  LV Status              available
  # open                 1
  LV Size                1.70 TiB
  Current LE             445906
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1
   
root@server2:~#

Posted in Linux