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| 本次目的为缩小lv2的空间，并将压缩后的空间用来扩容LV1
3.1、卸载LV2挂载目录：
[iyunv@manager ~]# umount /test2
3.2、运行e2fsck命令，该命令是用来检查逻辑卷是否有问题：(注：参数-f是遇见错误直接修复不提示。)
[iyunv@manager ~]# e2fsck -f /dev/vg1/lv2
e2fsck 1.41.12 (17-May-2010)
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/vg1/lv2: 20/655360 files (0.0% non-contiguous), 79663/2621440 blocks
3.3、缩小的文件系统大小为8G:
[iyunv@manager ~]# resize2fs /dev/vg1/lv2 8G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/vg1/lv2 to 2097152 (4k) blocks.
The filesystem on /dev/vg1/lv2 is now 2097152 blocks long.
3.4、缩小逻辑卷LV2空间为8G：
[iyunv@manager ~]# lvreduce -L 8G /dev/vg1/lv2
WARNING: Reducing active logical volume to 8.00 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv2? [y/n]: y
Reducing logical volume lv2 to 8.00 GiB
Logical volume lv2 successfully resized
再次查看卷组和逻辑卷情况：
[iyunv@manager ~]# lvs
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
LogVol00 VolGroup -wi-ao---- 57.70g
lv1 vg1 -wi-ao---- 5.00g
lv2 vg1 -wi-a----- 8.00g
[iyunv@manager ~]# vgs
VG #PV #LV #SN Attr VSize VFree
VolGroup 1 1 0 wz--n- 57.70g 0
vg1 1 2 0 wz--n- 19.99g 6.99g
3.5、挂载逻辑卷LV2到test2查看文件情况：
[iyunv@manager ~]# mount /dev/vg1/lv2 /test2
[iyunv@manager test2]# ll
total 16
-rw-r--r-- 1 root root 0 Aug 12 14:56 a1
-rw-r--r-- 1 root root 0 Aug 12 14:56 a2
-rw-r--r-- 1 root root 0 Aug 12 14:56 a3
-rw-r--r-- 1 root root 0 Aug 12 14:56 a4
-rw-r--r-- 1 root root 0 Aug 12 14:56 a5
-rw-r--r-- 1 root root 0 Aug 12 14:56 a6
-rw-r--r-- 1 root root 0 Aug 12 14:56 a7
-rw-r--r-- 1 root root 0 Aug 12 14:56 a8
-rw-r--r-- 1 root root 0 Aug 12 14:56 a9
drwx------ 2 root root 16384 Aug 12 14:51 lost+found
由以上可以看到缩小逻辑卷LV2后，文件内容仍然一样，并未丢失；缩小逻辑卷成功。
3.6、扩容逻辑卷LV1:
[iyunv@manager ~]# lvs
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
LogVol00 VolGroup -wi-ao---- 57.70g
lv1 vg1 -wi-ao---- 5.00g
lv2 vg1 -wi-ao---- 8.00g
（1）扩容到10G：
[iyunv@manager ~]# lvextend -L 10G /dev/vg1/lv1
Extending logical volume lv1 to 10.00 GiB
Logical volume lv1 successfully resized
[iyunv@manager ~]# lvdisplay
--- Logical volume ---
LV Path /dev/vg1/lv1
LV Name lv1
VG Name vg1
LV UUID RT9iu0-mhDi-clg9-8N2H-rJ1G-feuE-WUQOoa
LV Write Access read/write
LV Creation host, time manager.example.com, 2016-08-12 14:24:15 +0800
LV Status available
# open 1
LV Size 10.00 GiB
Current LE 2560
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
（2）扩容后，我们使用df命令查看/test1目录的大小；发现尽管逻辑卷已经扩容，但是逻辑卷所挂载的分区并没有扩容。
[iyunv@manager ~]# df -HT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-LogVol00 ext4 61G 3.6G 55G 7% /
tmpfs tmpfs 314M 0 314M 0% /dev/shm
/dev/sda1 ext4 305M 41M 249M 15% /boot
/dev/mapper/vg1-lv1 ext4 5.3G 145M 4.9G 3% /test1
/dev/mapper/vg1-lv2 ext4 8.5G 158M 7.9G 2% /test2
（3）执行resize2fs刷新挂载分区扩容：
[iyunv@manager ~]# resize2fs /dev/vg1/lv1
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg1/lv1 is mounted on /test1; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/vg1/lv1 to 2621440 (4k) blocks.
The filesystem on /dev/vg1/lv1 is now 2621440 blocks long.
看到LV1所挂载的分区已经变大：
[iyunv@manager ~]# df -HT
/dev/mapper/vg1-lv1 ext4 11G 147M 9.9G 2% /test1
/dev/mapper/vg1-lv2 ext4 8.5G 158M 7.9G 2% /test2
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