I'm using CentOS 7 64bit when writing this guide. Assume that you just add a new disk to the system name as /dev/sdb, now we will add it to LVM.
1. Get the LVM Information
Run this command
lvdisplay
You will see the output similar to the following
--- Logical volume ---
LV Path /dev/cl/root
LV Name root
VG Name cl
LV UUID 0hWLVK-3NY2-Tq4o-4oYd-4KGp-Wnhc-fW5CtP
...
--- Logical volume ---
LV Path /dev/cl/swap
LV Name swap
VG Name cl
Remember the LV Path /dev/cl/root and VG Name cl for later steps
2. Create physical volume
pvcreate /dev/sdb
3. Add physical volume to the volume group
vgextend cl /dev/sdb
4. Extend the logical volume
lvextend -l +100%FREE /dev/cl/root
5. Resize file system
(use resize2fs for ext4 file system)
xfs_growfs /
Note: if you change your sdb, then you can increase LVM by running the following commands:
pvresize /dev/sdb
lvextend -l +100%FREE /dev/cl/root
xfs_growfs /
Done!
