调整硬盘分区大小

想增加root空间，减少home空间。

1.查看硬盘使用情况。

[root@npm ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root   48G   45G   17M 100% /
tmpfs                         246M     0  246M   0% /dev/shm
/dev/sda1                     485M   33M  427M   8% /boot
/dev/mapper/VolGroup-lv_home   50G  180M   47G   1% /home

2.调整home分区大小

[root@npm ~]# umount /home
[root@npm ~]# 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: 11/3303104 files (0.0% non-contiguous), 253351/13207552 blocks
[root@npm ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 2G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 524288 (4k) blocks.
Begin pass 2 (max = 32768)
正在重定位块            XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 404)
正在扫描inode表          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/VolGroup-lv_home is now 524288 blocks long.

[root@npm ~]# mount /home
[root@npm ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root   48G   45G   17M 100% /
tmpfs                         246M     0  246M   0% /dev/shm
/dev/sda1                     485M   33M  427M   8% /boot
/dev/mapper/VolGroup-lv_home  2.0G  152M  1.8G   8% /home

3.释放空间

[root@npm ~]# lvreduce -L 2G /dev/mapper/VolGroup-lv_home
  WARNING: Reducing active and open logical volume to 2.00 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 2.00 GiB
  Logical volume lv_home successfully resized
[root@npm ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root   48G   45G   16M 100% /
tmpfs                         246M     0  246M   0% /dev/shm
/dev/sda1                     485M   33M  427M   8% /boot
/dev/mapper/VolGroup-lv_home  2.0G  152M  1.8G   8% /home
[root@npm ~]# 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               99.51 GiB
  PE Size               4.00 MiB
  Total PE              25474
  Alloc PE / Size       13088 / 51.12 GiB
  Free  PE / Size       12386 / 48.38 GiB
  VG UUID               ILLwIo-pQ0o-2Ayw-fYcP-QhcW-A1id-Sozp1f

4.增加空余空间到root

[root@npm ~]#  lvextend -L +48.38G /dev/mapper/VolGroup-lv_root
  Rounding size to boundary between physical extents: 48.38 GiB
  Extending logical volume lv_root to 96.54 GiB
  Logical volume lv_root successfully resized
[root@npm ~]# 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 = 7
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 25307136 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-lv_root is now 25307136 blocks long.

[root@npm ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root   96G   45G   46G  50% /
tmpfs                         246M     0  246M   0% /dev/shm
/dev/sda1                     485M   33M  427M   8% /boot
/dev/mapper/VolGroup-lv_home  2.0G  152M  1.8G   8% /home