*** 作步骤如下:
1.查看挂载的文件系统和lv
df -h 查看文件系统 ,下面是我要更改的文件系统。这里是99G
/dev/mapper/vg_LogVol01
99G 188M 94G 1% /home
lvdisplay 下面是文件系统对应的逻辑卷(lv)
--- Logical volume ---
LV Name/dev/vg_test/LogVol01
VG Namevg_test
LV UUIDcXylir-3KNW-UQ8a-kXos-fuIy-NAx2-0DJ5Fw
LV Write Accessread/write
LV Status available
# open 1
LV Size100.00 GiB
Current LE 800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
2. 卸载文件系统
umount /dev/mapper/vg_LogVol01
3. 查看是否卸载 df -h 文件系统已经没有了
4.文件系统检查 确认没有坏块
e2fsck -f /dev/mapper/vg_LogVol01
e2fsck 1.41.12 (17-May-2010)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mapper/vg_LogVol01: 11/6553600 files (0.0% non-contiguous), 459
349/26214400 blocks
5.缩小文件系统 到20g
resize2fs /dev/mapper/vg_LogVol01 20G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/vg_LogVol01 to 5242880 (4k) b
locks.
The filesystem on /dev/mapper/vg_LogVol01 is now 5242880 blocks long
6.缩小逻辑卷
lvreduce -L 20G /dev/vg_test/LogVol01
WARNING: Reducing active logical volume to 20.00 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce LogVol01? [y/n]: y
Reducing logical volume LogVol01 to 20.00 GiB
Logical volume LogVol01 successfully resized
7.挂载上文件系统
mount /dev/mapper/vg_LogVol01
8.通过df -h 和lvdisplay来查看是否已经修改
首先,建立新分区物理卷(PV),然后将该分区类型设定为lvm,之后就可以在该PV上建立卷组(VG),然后在VG里划分逻辑卷(LV),每个逻辑卷就相当于一个新的分区。需要调整分区(LV)大小时,如果是扩大LV,需要所属VG还有剩余未分配空间(Free PE),否则据需要先减小其它LV获得可用PE。再一点,LVM不是自动动态调整大小,而是需要用户调整。
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