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
