前提：将磁盘中未分区磁盘进行分区操作
https://www.cnblogs.com/guoxiangyue/p/10033367.html
然后进行vg扩容
1 pvcreate /dev/sdc
2 lvs
3 vgextend centos /dev/sdc
4 lvextend -L +99G /dev/centos/root
5 xfs_growfs /dev/centos/root
原文：https://www.cnblogs.com/guoxiangyue/p/10441691.html