centos 扩容空间
查找到新增的磁盘/dev/sdb
[root@localhost ~]# fdisk -l
磁盘 /dev/sdb：375.8 GB, 375809638400 字节，734003200 个扇区Units = 扇区 of 1 * 512 = 512 bytes扇区大小(逻辑/物理)：512 字节 / 512 字节I/O 大小(最小/最佳)：512 字节 / 512 字节
创建pv（物理卷）
[root@localhost ~]# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created
扩容vg（卷组）
[root@localhost ~]# vgextend centos /dev/sdb
Volume group "centos" successfully extended
[root@localhost ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 3 0 wz--n- 399.50g 350.00g
[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name centos
Alloc PE / Size 12673 / 49.50 GiB
Free PE / Size 89600 / 350.00 GiB
扩展lv（逻辑卷）
[root@localhost ~]# lvextend -L +350G /dev/mapper/centos-home Size of logical volume centos/home changed from 10.00 GiB (2560 extents) to 360.00 GiB (92160 extents). Logical volume home successfully resized
重定向lv大小
[root@localhost ~]# xfs_growfs /dev/mapper/centos-home
查看扩容结果
[root@localhost ~]# df -h文件系统 容量 已用 可用 已用% 挂载点/dev/mapper/centos-root 36G 4.1G 32G 12% //dev/mapper/centos-home 360G 37M 360G 1% /home/dev/sda1 497M 124M 373M 25% /boot
redhat6:
[root@localhost ~]# lvextend -L +295G /dev/mapper/VolGroup-lv_home
[root@localhost ~]# resize2fs /dev/mapper/VolGroup-lv_home
参考：
LVM逻辑卷管理教程:
http://www.server110.com/linux/201403/7420.html
linux动态增加LV空间:
http://www.cnblogs.com/weaver1/archive/2011/12/30/2307451.html