Linux LVM邏輯卷管理 調整分割區大小

測試機各種報錯，建立個目錄都報錯，df看了一下，發現VolGroup-lv_root 100%，虛擬磁碟滿了，怎麼辦呢

1，解決過程

# df -h //檢視分割區
# umount /home //取消掛載
# e2fsck -f /dev/mapper/VolGroup-lv_home //分割區檢測
# resize2fs -p /dev/mapper/VolGroup-lv_home 100G //將lv_home虛擬分割區設為100G
# mount /home //掛載home
# df -h //檢視分割區
# lvreduce -L 100G /dev/mapper/VolGroup-lv_home //釋放空間
# vgdisplay //檢視可用空間大小
# lvextend -L +311.47G /dev/mapper/VolGroup-lv_root //擴充套件lv_root虛擬分割區
# resize2fs -p /dev/mapper/VolGroup-lv_root //lv_root重設分割區大小

LVM（邏輯磁碟管理），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)
請先執行 'e2fsck -f /dev/mapper/VolGroup-lv_home'.  //提示要先進行磁碟檢測

[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: 檢查目錄連線性
Pass 4: Checking reference counts
第5步: 檢查簇概要資訊
/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

• 使用LVM建立彈性磁碟儲存——第一部分  http://www.linuxidc.com/Linux/2014-10/107697.htm
• 在Linux中擴充套件/縮減LVM（第二部分）  http://www.linuxidc.com/Linux/2014-10/107786.htm
• 在 LVM中 錄制邏輯卷快照並恢復（第三部分） http://www.linuxidc.com/Linux/2014-11/108867.htm
• 在LVM中設定精簡資源調配卷（第四部分） http://www.linuxidc.com/Linux/2014-11/109757.htm
• 使用條塊化I/O管理多個LVM磁碟（第五部分） http://www.linuxidc.com/Linux/2014-12/110532.htm

本文永久更新連結地址：http://www.linuxidc.com/Linux/2015-08/121664.htm