Hits :

lvm basics

physical volumes

# pvs
  PV         VG     Fmt  Attr PSize   PFree  
  /dev/sda2  vg_790 lvm2 a--  465.52g 211.52g

list physical volumes

# pvdisplay 

# pvdisplay  -C

volume groups

# vgs
  VG     #PV #LV #SN Attr   VSize   VFree  
  vg_790   1  10   0 wz--n- 465.52g 211.52g

list all volume groups

# vgscan

# vgdisplay

# vgdisplay -C

activate all 

# vgchange -ay

deactivate a specific volume group

# vgchange -an vol_group_1

activate all logical volumes on a volume group, only

# vgchange -ay vol_group_1

logical volumes

list logical volumes

# lvs

# lvdisplay -C

Create a new LVM partition

# lvcreate -L 10G -n /dev/vg_group01/lv_vol01 

# mkfs.ext4 -L lv_vol01 /dev/vg_group01/lv_vol01 

# mount /dev/vg_group01/lv_vol01 /media/

extend an lvm partition

How to extend an lvm partition:

umount /opt/dnl

lvextend -L +5G /dev/vg01/dnl

e2fsck -f /dev/vg01/dnl

resize2fs /dev/vg01/dnl 

mount /opt/dnl/

reduce

lvresize -l +100%FREE -n /dev/vg01/backup