在前面的实验中，卷组是由两块硬盘设备共同组成的。用户在使用存储设备时感知不到设备底层的架构和布局，更不用关心底层是由多少块硬盘组成的，只要卷组中有足够的资源，就可以一直为逻辑卷扩容。扩展前请一定要记得卸载设备和挂载点的关联。

[root@linuxprobe ~]# umount /linuxprobe 第1步：把上一个实验中的逻辑卷vo扩展至290MB。

[root@linuxprobe ~]# lvextend -L 290M /dev/storage/vo Rounding size to boundary between physical extents: 292.00 MiB Extending logical volume vo to 292.00 MiB Logical volume vo successfully resized 第2步：检查硬盘完整性，并重置硬盘容量。

[root@linuxprobe ~]# e2fsck -f /dev/storage/vo e2fsck 1.42.9 (28-Dec-2013) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/storage/vo: 11/38000 files (0.0% non-contiguous), 10453/151552 blocks [root@linuxprobe ~]# resize2fs /dev/storage/vo resize2fs 1.42.9 (28-Dec-2013) Resizing the filesystem on /dev/storage/vo to 299008 (1k) blocks. The filesystem on /dev/storage/vo is now 299008 blocks long. 第3步：重新挂载硬盘设备并查看挂载状态。

[root@linuxprobe ~]# mount -a [root@linuxprobe ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/rhel-root 18G 3.0G 15G 17% / devtmpfs 985M 0 985M 0% /dev tmpfs 994M 80K 994M 1% /dev/shm tmpfs 994M 8.8M 986M 1% /run tmpfs 994M 0 994M 0% /sys/fs/cgroup /dev/sr0 3.5G 3.5G 0 100% /media/cdrom /dev/sda1 497M 119M 379M 24% /boot /dev/mapper/storage-vo 279M 2.1M 259M 1% /linuxprobe