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lvm basics 

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== physical volumes ==

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

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list  physical volumes 

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# pvdisplay 

# pvdisplay  -C

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== volume groups ==

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

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list all volume groups

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# vgscan

# vgdisplay

# vgdisplay -C

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activate all 

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# vgchange -ay 
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deactivate a specific volume group

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# vgchange -an vol_group_1
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activate all logical volumes on a volume group, only

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# vgchange -ay vol_group_1
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== logical volumes ==

list logical volumes

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# lvs

# lvdisplay -C

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== Create a new LVM partition ==

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# 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/

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== extend an lvm partition ==

How to extend an lvm partition:

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umount /opt/dnl

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

e2fsck -f /dev/vg01/dnl

resize2fs /dev/vg01/dnl 

mount /opt/dnl/
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== resize to 100% ==

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