Step-by-Step Guide to Expanding Linux Root Partition with LVM

Before expanding the root filesystem, check current disk usage and existing partitions.

df -hl

fdisk -l

Identify the new disk (e.g., /dev/sdb) and create a partition on it.

fdisk /dev/sdb

Create a physical volume on the new partition. pvcreate /dev/sdb1 Verify the physical volume.

pvdisplay

Extend the existing volume group (named centos) to include the new physical volume. vgextend centos /dev/sdb1 Check the free space in the volume group.

vgdisplay

Increase the size of the logical volume that holds the root filesystem.

lvextend -L +60G /dev/mapper/centos-root

Resize the XFS filesystem to use the added space.

xfs_growfs /dev/mapper/centos-root

Finally, confirm that the root partition has grown.

df -hl