centos使用lvm扩容根分区

1、添加新硬盘或者建立新分区

2、将建立好的分区制作成pv

pvcreate /dev/sda3

3、将新pv加入到根分区所在的卷组centos

vgextend centos /dev/sda3

4、根分区所在的lv扩容至30G

lvextend -L +30G /dev/centos/root

5、至此lv容量已扩容，接着改变文件系统容量：

xfs_growfs /dev/mapper/centos-root

meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=524032 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=2096128, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 2096128 to 9436160

完成