LVM disk

Physical volumes are combined into volume groups (VGs). This creates a pool of disk space out of which logical volumes can be allocated.


Within a volume group, the disk space available for allocation is divided into units of a fixed-size called extents. An extent is the smallest unit of space that can be allocated, Within a physical volume, extents are referred to as physical extents.


A logical volume is allocated into logical extents of the same size as the physical extents. The extent size is thus the same for all logical volumes in the volume group. The volume group maps the logical extents to physical extents.

 

Extend a file system created on LVM disk

Add a new HDD or create a new disk in the VM

To see the new disk, you need to force a hard scan echo "- - -" > /sys/class/scsi_host/host0/scan  

Create a partition LVM in new disk (sdx)

 

 

 

 

 

 

fdisk /dev/sdx
-> n
-> p
->1
<CR>
<CR>

t
8e

w


Create a new partition
Primary partition
Partition number 1
Start partition (just return)
End partition (just return)

Partition type
LMV partition

Write modification to disk
 Create a physical volume  pvcreate /dev/sdx1  LMV partition 1 of sdx
 Display volume group  vgdisplay  Get you vgname you want extend
 Extend you volume group  vgextend vgname /dev/sdx1  
Display logical volume lvdisplay Get your /path/lvname to extend
Extend you lvname lvextend -L +size /path/lvname /dev/sdx1  
Extend you fs resize2fs /path/lvname  

Create a new file system on LVM disk

Create or add a new disk /dev/sdx find /dev/sdx with fdisk -l  
Create a physical volume pvcreate /dev/sdx  
Create a volume group vgcreate vg_name /dev/sdx  
Create a logical volume lvcreate -l 100%VG -n lv_name vg_name  
Format the logical volume mkfs.ext4 /dev/mapper/vg_name-lv_name  
     

 Thank's to /https://www.rootusers.com/how-to-increase-the-size-of-a-linux-lvm-by-adding-a-new-disk/

 

 

Détails