測試機各種報錯，創建個目錄都報錯，df看了一下，發現VolGroup-lv_root 100%，虛擬磁盤滿了，怎麼辦呢
1，解決過程
# df -h //查看分區
# umount /home //取消掛載
# e2fsck -f /dev/mapper/VolGroup-lv_home //分區檢測
# resize2fs -p /dev/mapper/VolGroup-lv_home 100G //將lv_home虛擬分區設為100G
# mount /home //掛載home
# df -h //查看分區
# lvreduce -L 100G /dev/mapper/VolGroup-lv_home //釋放空間
# vgdisplay //查看可用空間大小
# lvextend -L +311.47G /dev/mapper/VolGroup-lv_root //擴展lv_root虛擬分區
# resize2fs -p /dev/mapper/VolGroup-lv_root //lv_root重設分區大小
LVM（邏輯磁盤管理），靈活性很高.
2，詳細解決過程
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 50G 47G 16M 100% / //lv_root滿了
tmpfs 1.9G 72K 1.9G 1% /dev/shm
/dev/sda1 485M 40M 420M 9% /boot
/dev/mapper/VolGroup-lv_home 406G 19G 366G 5% /home //lv_home空間很多
[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/VolGroup-lv_home is mounted on /home; on-line resizing required
On-line shrinking from 107865088 to 65536000 not supported. //先umount才能resize2fs
[root@localhost ~]# umount /home //umount home目錄
[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G
resize2fs 1.41.12 (17-May-2010)
請先運行 'e2fsck -f /dev/mapper/VolGroup-lv_home'. //提示要先進行磁盤檢測
[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_home
e2fsck 1.41.12 (17-May-2010)
第一步: 檢查inode,塊,和大小
第二步: 檢查目錄結構
第3步: 檢查目錄連接性
Pass 4: Checking reference counts
第5步: 檢查簇概要信息
/dev/mapper/VolGroup-lv_home: 1459/16384000 files (4.0% non-contiguous), 5914204/65536000 blocks
[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G //重定大小
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 26214400 (4k) blocks.
Begin pass 2 (max = 32768)
正在重定位塊 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 2000)
正在掃描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/VolGroup-lv_home is now 26214400 blocks long.
[root@localhost ~]# mount /home/
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 50G 47G 16M 100% /
tmpfs 1.9G 72K 1.9G 1% /dev/shm
/dev/sda1 485M 40M 420M 9% /boot
/dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home
[root@localhost ~]# lvreduce -L 100G /dev/mapper/VolGroup-lv_home //釋放空間
WARNING: Reducing active and open logical volume to 100.00 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 100.00 GiB
Logical volume lv_home successfully resized
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 50G 47G 16M 100% /
tmpfs 1.9G 72K 1.9G 1% /dev/shm
/dev/sda1 485M 40M 420M 9% /boot
/dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home
[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 465.27 GiB
PE Size 4.00 MiB
Total PE 119109
Alloc PE / Size 39372 / 153.80 GiB
Free PE / Size 79737 / 311.47 GiB //空閒空間
VG UUID Vt2V4t-Byxs-tQqk-cY0h-IDE3-pabX-LUfkRS
[root@localhost ~]# lvextend -L +311.47G /dev/mapper/VolGroup-lv_root //空閒空間加入到lv_root
Rounding size to boundary between physical extents: 311.47 GiB
Extending logical volume lv_root to 361.47 GiB
Logical volume lv_root successfully resized
[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 = 23 //這兒要耐心等待，擴大越多，時間越長
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 94757888 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-lv_root is now 94757888 blocks long.
[root@localhost openfire]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 356G 48G 308G 14% /
tmpfs 1.9G 72K 1.9G 1% /dev/shm
/dev/sda1 485M 40M 420M 9% /boot
/dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home
