Logical Volume Manager (LVM)
Listing Physical Volumes (PV)
bougui@mantrisse ~> sudo pvs
PV VG Fmt Attr PSize PFree
/dev/sda5 mantrisse-vg lvm2 a-- 465,52g 247,52g
Listing Volume Groups (VG)
bougui@mantrisse ~> sudo vgs
VG #PV #LV #SN Attr VSize VFree
mantrisse-vg 1 3 0 wz--n- 465,52g 247,52g
Listing Logical Volumes (LV)
bougui@mantrisse ~> sudo lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home mantrisse-vg -wi-ao---- 100,00g
root mantrisse-vg -wi-ao---- 100,00g
swap_1 mantrisse-vg -wi-ao---- 18,00g
Display informations about logical volumes
bougui@mantrisse ~> sudo lvdisplay
[...]
--- Logical volume ---
LV Path /dev/mantrisse-vg/home
LV Name home
VG Name mantrisse-vg
[...]
LV Write Access read/write
LV Creation host, time mantrisse, 2015-09-02 14:34:37 +0200
LV Status available
# open 1
LV Size 100,00 GiB
Current LE 25600
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:2
Resize a given LV
Resize /dev/mantrisse-vg/home by adding 50 Go:
bougui@mantrisse ~> sudo lvresize -L+50g /dev/mantrisse-vg/home
Size of logical volume mantrisse-vg/home changed from 100,00 GiB (25600 extents) to 150,00 GiB (38400 extents).
Logical volume home successfully resized
and then resize the file system to cover the full space available:
bougui@mantrisse ~> sudo resize2fs /dev/mantrisse-vg/home
resize2fs 1.42.12 (29-Aug-2014)
Le système de fichiers de /dev/mantrisse-vg/home est monté sur /home ; le changement de taille doit être effectué en ligne
old_desc_blocks = 7, new_desc_blocks = 10
Le système de fichiers sur /dev/mantrisse-vg/home a maintenant une taille de 39321600 blocs (4k).
Use pvresize to grow the LVM PV to match the size of the partition
If the physical volume to resize is /dev/sda5, just do:
bougui@mantrisse ~> sudo pvresize /dev/sda5
Shrink a given LV:
It’s a little more tricky to do. First, start from a rescue system (like clonezilla) on an usb stick or a CD.
Be sure that the filesystem you want to shrink is unmount (use the umount command if required).
Check the filesystem (here: /dev/mantrisse-vg/home)
$ sudo e2fsck -f /dev/mantrisse-vg/home
Shrink the filesystem:
E.g. to shrink the filesystem to 500G:
$ sudo resize2fs /dev/mantrisse-vg/home 500G
Reduce the logical volume:
$ sudo lvreduce -L 500G /dev/mantrisse-vg/home
Create a Logical volume
Logical Volume creation of size 500G with name backup in the Volume Group mantrisse-vg
bougui@mantrisse ~> sudo lvcreate -L 500G -n backup mantrisse-vg
Create the ext4 filesystem
bougui@mantrisse ~> sudo mkfs -t ext4 /dev/mantrisse-vg/backup
Edit the fstab to mount the LV:
/dev/mapper/mantrisse--vg-backup /backup ext4 defaults 0 2
Mount the LV:
bougui@mantrisse ~> sudo mount /backup
Rename a logical volume:
bougui@mantrisse ~> sudo lvrename VG_NAME OLD_LV_NAME NEW_LV_NAME