查看当前磁盘信息：

[root@localhost ~]# df -h

文件系统 容量 已用 可用 已用%% 挂载点/dev/mapper/VolGroup-lv_root 154G 7.9G 139G 6% /tmpfs 1.9G 100K 1.9G 1% /dev/shm/dev/sda1 485M 69M 391M 15% /boot/dev/mapper/VolGroup-lv_home

299G 984M 283G 1% /home

将VolGroup-lv_home缩小到20G，并将剩余的空间添加给VolGroup-lv_root

先卸载/home：

[root@localhost ~]# umount /home[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_homee2fsck 1.41.12 (17-May-2010)第一步: 检查inode,块,和大小第二步: 检查目录结构第3步: 检查目录连接性Pass 4: Checking reference counts第5步: 检查簇概要信息/dev/mapper/VolGroup-lv_home: 21/19857408 files (0.0% non-contiguous),1498180/79429632 blocks

注：e2fsck为检查磁盘正确性

[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 20G

resize2fs 1.41.12 (17-May-2010)Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 5242880 (4k) blocks.Begin pass 2 (max = 32778)正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXBegin pass 3 (max = 2424)正在扫描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXBegin pass 4 (max = 10)正在更新inode引用 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXThe filesystem on /dev/mapper/VolGroup-lv_home is now 5242880 blocks long.

注：resize2fs 为重新设定磁盘大小，只是重新指定一下大小，并不对结果有影响，需要下面lvreduce的配合

[root@localhost ~]# mount /home[[root@localhost ~]# lvreduce -L 20G /dev/mapper/VolGroup-lv_home WARNING: Reducing active and open logical volume to 20.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.)Do you really want to reduce lv_home? [y/n]: y Reducing logical volume lv_home to 20.00 GiB Logical volume lv_home successfully resized

注：lvreduce -L 20G的意思为设置当前文件系统为20G，如果lvreduce -l 20G是指从当前文件系统上减少20G

[root@localhost ~]# df -h文件系统 容量 已用 可用 已用%% 挂载点/dev/mapper/VolGroup-lv_root 154G 7.9G 139G 6% /tmpfs 1.9G 100K 1.9G 1% /dev/shm/dev/sda1 485M 69M 391M 15% /boot/dev/mapper/VolGroup-lv_home20G 962M 18G 6% /home(说明成功了)

[root@localhost ~]# vgdisplay --- Volume group --- VG Name VolGroup System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 7 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 465.27 GiB PE Size 4.00 MiB Total PE 119109 Alloc PE / Size 46660 / 182.27 GiB Free PE / Size 72449 / 283.00 GiB VG UUID gPA8XS-ZncK-mGQj-2Vn9-TFTQ-6yOU-6atjE9

注：vgdisplay为显示LVM卷组的元数据信息

[root@localhost ~]# lvextend -L +283G /dev/mapper/VolGroup-lv_root Extending logical volume lv_root to 439.39 GiB Logical volume lv_root successfully resized

注：lvextend -L +283G为在文件系统上增加238G

[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_rootresize2fs 1.41.12 (17-May-2010)Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing requiredold desc_blocks = 10,new_desc_blocks = 28Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 115183616 (4k) blocks.The filesystem on /dev/mapper/VolGroup-lv_root is now 115183616 blocks long.

检查一下调整的结果：

[root@localhost ~]# df -h 433G 7.9G 403G 2% / 20G 962M 18G 6% /home

总结

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