lvm

add new disk to a volume group

what disk will be used, and what group will be extended?

$ lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0   16G  0 disk
|-sda1            8:1    0    1G  0 part /boot
`-sda2            8:2    0   15G  0 part
  |-centos-root 253:0    0 29.4G  0 lvm  /
  `-centos-swap 253:1    0  1.6G  0 lvm
sdb               8:16   0   16G  0 disk
sr0              11:0    1 1024M  0 rom

in my case, i want to add sdb to / (group centos-root). run all as root user.

pvcreate /dev/sdb
lvmdiskscan -l
vgextend centos /dev/sdb
lvm lvextend -l +100%FREE /dev/mapper/centos-root
xfs_growfs /dev/mapper/centos-root