7.2.2 扩容逻辑卷

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