1.新建2个分区(略)

2.修改分区id为8e

3.partprobe

4.初始化物理卷

[root@ www.linuxidc.com ~]# pvcreate /dev/sda7 /dev/sda8

Physical volume "/dev/sda7" successfully created

Physical volume "/dev/sda8" successfully created

5.创建卷组

[root@ www.linuxidc.com ~]# vgcreate testvg /dev/sda7 /dev/sda8

Volume group "testvg" successfully created

6创建逻辑卷，不要占用所有空间

[root@ www.linuxidc.com ~]# lvcreate -L 40M -n testlv testvg

Logical volume "testlv" created

[root@ www.linuxidc.com data-lv]# df

Filesystem           1K-blocks      Used Available Use% Mounted on

/dev/sda2              6940516   2217116   4365152  34% /

/dev/sda1               101086     11009     84858  12% /boot

tmpfs                   972276         0    972276   0% /dev/shm

/dev/md2                972280     17632    905256   2% /mnt

/dev/mapper/testvg-testlv

39663     39640         0 100% /data-lv

7在逻辑卷上创建ext3文件系统：

mke2fs –j  /dev/testvg/testlv

8创建data-lv目录并挂载

9在testlv目录下创建文件

[root@ www.linuxidc.com data-lv]# dd if=/dev/zero of=/data-lv/bigfile bs=1M count=50

dd: writing `/data-lv/bigfile': No space left on device

35+0 records in

34+0 records out

35733504 bytes (36 MB) copied, 1.30968 seconds, 27.3 MB/s

提示空间不足

10 扩展逻辑卷，再增加50M，须先调整分区大小 再调整文件系统大小

[root@ www.linuxidc.com ~]# lvextend -L +50M /dev/testvg/testlv

Rounding up size to full physical extent 52.00 MB

Extending logical volume testlv to 92.00 MB

Logical volume testlv successfully resized

[root@ www.linuxidc.com ~]# resize2fs /dev/testvg/testlv

[root@ www.linuxidc.com ~]# df

Filesystem           1K-blocks      Used Available Use% Mounted on

/dev/sda2              6940516   2217120   4365148  34% /

/dev/sda1               101086     11009     84858  12% /boot

tmpfs                   972276         0    972276   0% /dev/shm

/dev/md2                972280     17632    905256   2% /mnt

/dev/mapper/testvg-testlv

91099     40117     46276  47% /data-lv