Create lvm step by step

 Create LVM

In this example /dev/sdc is used which is 3G

Step 1: Creating physical volume (pv)

• Command to create pv is  "pvcreate /dev/sdc"

• Command to verify the pv is "pvs"

Step 2: Creating volume group (vg)

• Command to create vg is "vgcreate <vgname> </dev/sdc>"

• Command to verify the vg is "vgs"

Step 3: Creating  logical volume (lv)

• Command to create lv is "lvcreate -n <lvname> -L 1G  <vgname>"

-n specify the logical volume

-L absolute value

• Command to verify the "lvs"

After creating lv thats how its looks

Step 4: Create file system using xfs or ext4,ext3

Create file system on lvm using xfs or ext

Step 5: Mount persistently in /etc/fstab

In /etc/fstab entry will be like 

</dev/datavg/datalv>   </mnt/datalvm>  <xfs> defaults 0 0

Follow this link to know about whats is lvm & why we create it:

https://linuxgeekseasywords.blogspot.com/2022/09/what-is-logical-volume-manager-lvm-and.html