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安装centos6.3使用自动推荐分区，发现一个问题/home 分区过大，超过了1.1T。[root@localhost ~]# df -h 文件系统 容量 已用 可用 已用%% 挂载点 /dev/mapper/VolGroup-lv_root 50G 2.9G 44G 7% / tmpfs 5.9G 100K 5.9G 1% /dev/shm /dev/sda1 485M 37M 423M 8% /boot /dev/mapper/VolGroup-lv_home 1.1T 200M 988G 1% /home 目标：/home分20G，剩下添加给/目录下。1.查看分区模式[root@localhost ~]# df -h 文件系统 容量 已用 可用 已用%% 挂载点 /dev/mapper/VolGroup-lv_root 50G 2.9G 44G 7% / tmpfs 5.9G 100K 5.9G 1% /dev/shm /dev/sda1 485M 37M 423M 8% /boot /dev/mapper/VolGroup-lv_home 1.1T 200M 988G 1% /home 2.卸载挂载分区[root@localhost ~]# umount /home3.检查VolGroup-lv_home文件的错误性，-f 即使文件系统没有错误迹象，仍强制地检查正确性。[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_home e2fsck 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: 27/69304320 files (0.0% non-contiguous), 4400705/277215232 blocks 4.调整/home为20G，[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 = 32784) 正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 3 (max = 8460) 正在扫描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 4 (max = 15) 正在更新inode引用 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX The filesystem on /dev/mapper/VolGroup-lv_home is now 5242880 blocks long. 5.重新挂载并查看[root@localhost ~]# mount /home [root@localhost ~]# df -h 文件系统 容量 已用 可用 已用%% 挂载点 /dev/mapper/VolGroup-lv_root 50G 2.9G 44G 7% / tmpfs 5.9G 100K 5.9G 1% /dev/shm /dev/sda1 485M 37M 423M 8% /boot /dev/mapper/VolGroup-lv_home 20G 172M 19G 1% /home 6.划分20G外面的剩余空间。使用lvreduce指令用于减少LVM逻辑卷占用的空间大小。可能会删除逻辑卷上已有的数据，所以在操作前必须进行确认。记得输入 “y”[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 [root@localhost ~]# df -h 文件系统 容量 已用 可用 已用%% 挂载点 /dev/mapper/VolGroup-lv_root 50G 2.9G 44G 7% / tmpfs 5.9G 100K 5.9G 1% /dev/shm /dev/sda1 485M 37M 423M 8% /boot /dev/mapper/VolGroup-lv_home 20G 172M 19G 1% /home 7.查看“Free PE / Size”剩余空间[root@localhost ~]# vgdisplay --- Volume group --- VG Name VolGroup System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 5 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 1.09 TiB PE Size 4.00 MiB Total PE 285022 Alloc PE / Size 19424 / 75.88 GiB Free PE / Size 265598 / 1.01 TiB VG UUID nSbflh-J7fN-xDvf-zLjL-tFcu-Y5Tm-ybnDk0 8.使用lvextend指令：扩展逻辑卷空间到/dev/mapper/VolGroup-lv_root目录下，也就是“/”目录下。[root@localhost ~]# lvextend -L +1.01T /dev/mapper/VolGroup-lv_root Rounding size to boundary between physical extents: 1.01 TiB Extending logical volume lv_root to 1.06 TiB Logical volume lv_root successfully resized 9.执行操作，使之生效，中间一定要耐心等待。 [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required old desc_blocks = 4, new_desc_blocks = 68 Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 284227584 (4k) blocks. The filesystem on /dev/mapper/VolGroup-lv_root is now 284227584 blocks long. 10.查看分区成功[root@localhost ~]# df -h 文件系统 容量 已用 可用 已用%% 挂载点 /dev/mapper/VolGroup-lv_root 1.1T 2.9G 1011G 1% / tmpfs 5.9G 100K 5.9G 1% /dev/shm /dev/sda1 485M 37M 423M 8% /boot /dev/mapper/VolGroup-lv_home 20G 172M 19G 1% /home 11.重启[root@localhost ~]# shutdown -r now
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