lvm下缩小根分区

ゞ浴缸里的玫瑰 2022-08-08 14:46 236阅读 0赞

一/先查看当前的 根分区 大小为21G  
\[root@test-disk ~\]\# df -h  
Filesystem Size Used Avail Use% Mounted on  
/dev/mapper/VolGroup00-LogVol00 21G 960M 19G 5% /  
/dev/mapper/VolGroup00-LogVol02 7.6G 151M 7.3G 2% /home  
/dev/hda1 99M 12M 82M 13% /boot  
tmpfs 189M 0 189M 0% /dev/shm  
  
二/插入系统光盘，启动后输入linux rescue进去救援模式，不要配置网络，不要让系统根挂载到/mnt/sysimage上，所以最后的界面选择“skip”

[![133231930.png][]][133231930.png]

分别为：查看物理卷 查看卷组 查看逻辑卷 激活逻辑卷  
  
三/开始减小根文件系统大小

[![133309160.png][]][133309160.png]

四/减小根lv大小

[![133342874.png][]][133342874.png]

[![133357331.png][]][133357331.png]

此时得出LogVol00的LE数量为682，总的PE数量为956，大小32M，所以可以减少的大小为  
（956-682）\*32M=8768M

[![133429585.png][]][133429585.png]

五/重启进去系统，再次查看根分区情况  
\[root@test-disk ~\]\# df -h  
Filesystem Size Used Avail Use% Mounted on  
/dev/mapper/VolGroup00-LogVol00  13G 956M 12G 8% /  
/dev/mapper/VolGroup00-LogVol02 7.6G 151M 7.3G 2% /home  
/dev/hda1 99M 12M 82M 13% /boot  
tmpfs 189M 0 189M 0% /dev/shm  
  
\[root@test-disk ~\]\# vgdisplay 查看卷组情况  
\--- Volume group ---  
VG Name VolGroup00  
System ID  
Format lvm2  
Metadata Areas 1  
Metadata Sequence No 10  
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 29.88 GB  
PE Size 32.00 MB  
Total PE  956  
Alloc PE / Size  682 / 21.31 GB  
Free PE / Size 274 / 8.56 GB  
VG UUID l6vUxv-U8KC-gVdH-RQH5-QuUC-jsdl-HjpVqN  
  
\[root@test-disk ~\]\# lvdisplay /dev/VolGroup00/LogVol00  
\--- Logical volume ---  
LV Name /dev/VolGroup00/LogVol00  
VG Name VolGroup00  
LV UUID Nbcfw3-7jG7-URyG-fRdl-5k6j-x0BC-EFpt0J  
LV Write Access read/write  
LV Status available  
\# open 1  
LV Size  12.75 GB  
Current LE 408  
Segments 1  
Allocation inherit  
Read ahead sectors auto  
\- currently set to 256  
Block device 253:0  
  
六/把从根分区减出的添加到/home  
\[root@test-disk ~\]\# umount /home/  
\[root@test-disk ~\]\# e2fsck -f /dev/VolGroup00/LogVol02  
e2fsck 1.39 (29-May-2006)  
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/VolGroup00/LogVol02: 11/2064384 files (9.1% non-contiguous), 103072/2048000 blocks  
  
\[root@test-disk ~\]\# lvextend -l \+274 /dev/VolGroup00/LogVol02  
/dev/cdrom: open failed: Read-only file system  
Extending logical volume LogVol02 to 16.38 GB  
Logical volume LogVol02 successfully resized  
  
\[root@test-disk ~\]\# e2fsck -f /dev/VolGroup00/LogVol02  
e2fsck 1.39 (29-May-2006)  
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/VolGroup00/LogVol02: 11/2064384 files (9.1% non-contiguous), 103072/2048000 blocks  
  
\[root@test-disk ~\]\# resize2fs /dev/VolGroup00/LogVol02  
resize2fs 1.39 (29-May-2006)  
Resizing the filesystem on /dev/VolGroup00/LogVol02 to 4292608 (4k) blocks.  
The filesystem on /dev/VolGroup00/LogVol02 is now 4292608 blocks long.  
  
\[root@test-disk ~\]\# mount -a  
  
\[root@test-disk ~\]\# df -h 再次查看，成功  
Filesystem Size Used Avail Use% Mounted on  
/dev/mapper/VolGroup00-LogVol00 13G 956M 12G 8% /  
/dev/hda1 99M 12M 82M 13% /boot  
tmpfs 189M 0 189M 0% /dev/shm  
/dev/mapper/VolGroup00-LogVol02  16G 155M 16G 1% /home

[133231930.png]: /images/20220731/936d520b9a6e4df8802e6da52de28d12.png
[133309160.png]: /images/20220731/382684bcc6244325b90a1a788fc01d84.png
[133342874.png]: /images/20220731/7a2031620c844e9f8989d1f1350f345f.png
[133357331.png]: /images/20220731/4b3010abdd3042d3817c7b3452f10d95.png
[133429585.png]: /images/20220731/d8c98d928eea4cb59d46fcb7eaefad96.png