参考：https://blog.csdn.net/qq_39450259/article/details/115518524
https://blog.csdn.net/jiabinzhang4310/article/details/100183731

1. 格式化4T硬盘

# fdisk -lDisk /dev/sdb: 4000.8 GB, 4000787030016 bytes, 7814037168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

parted /dev/sdb (选择硬盘)

(parted) mklabel gpt (转换gpt分区)

2.分区，格式化

# fdisk /dev/sdb

划分4T到一个分区

#  mkfs -t xfs /dev/sdb1

3.扩容根目录

# lvsLV   VG     Attr       LSize    Pool Origin Data%  Meta%  Move Log Cpy%Sync Converthome centos -wi-ao---- <150.21g                                                    root centos -wi-ao----   50.00g                                                    swap centos -wi-ao----  <22.36g 

# pvcreate /dev/sdb1

# pvdisplay

# pvs

#  vgextend centos /dev/sdb1

# lvextend -l +100%FREE /dev/centos/root

# df -H