How to Expand an LVM Partition on CentOS 7 in Production

Background

Production environments often encounter insufficient disk space; the following steps show how to extend an LVM‑based /home partition on CentOS 7.

Check current disk usage

lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda       8:0    0   20G  0 disk
├─sda1   8:1    0  200M  0 part /boot
└─sda2   8:2    0   19G  0 part
  ├─centos-root 253:0 0 10G lvm /
  ├─centos-swap 253:1 0  4G lvm [SWAP]
  └─centos-home 253:2 0  5G lvm /home
sr0      11:0    0 4.2G  0 rom

Add new disk and create LVM partition

# fdisk /dev/sdb
... (create a new primary partition /dev/sdb1 of 5G, type 8e for Linux LVM) ...
# w   (write changes)

Initialize physical volume

# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created.

Extend volume group

# vgextend centos /dev/sdb1
Volume group "centos" successfully extended

Resize logical volume

# lvresize -L +4G /dev/centos/home
Size of logical volume centos/home changed from 5.00 GiB (1280 extents) to 9.00 GiB (2304 extents).
Logical volume centos/home successfully resized.

Resize filesystem

If the filesystem is XFS, run: # xfs_growfs /dev/centos/home If it is ext4, run:

# resize2fs /dev/centos/home

Verify the expansion

# lsblk
... shows /dev/mapper/centos-home now 9G ...
# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  10G   927M  9.1G  10% /
/dev/mapper/centos-home   9G    33M   9G   1% /home
...

After these steps the /home partition has grown from 5 GiB to 9 GiB, completing the disk‑space expansion.