LVM缩容

当前环境

root@jmk:~/shell# lsblk 
NAME               MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
nvme0n1            259:0    0 953.9G  0 disk 
|-nvme0n1p1        259:1    0   512M  0 part /boot/efi
|-nvme0n1p2        259:2    0   488M  0 part /boot
`-nvme0n1p3        259:3    0 952.9G  0 part |-jmk--vg-root   254:0    0  27.9G  0 lvm  /|-jmk--vg-swap_1 254:1    0   976M  0 lvm  [SWAP]|-jmk--vg-home   254:2    0   100G  0 lvm  /home|-jmk--vg-wxy    254:3    0   700G  0 lvm  /wxy|-jmk--vg-docker 254:4    0    30G  0 lvm  /var/lib/docker`-jmk--vg-data   254:5    0    94G  0 lvm  /data

需求

• 将data分区缩小到10G，并将空出的空间给到wxy

开始操作

取消挂载

在进行容量操作的时候,需要先取消挂载

root@jmk:~/shell# umount /data 
root@jmk:~/shell# lsblk 
NAME               MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
nvme0n1            259:0    0 953.9G  0 disk 
|-nvme0n1p1        259:1    0   512M  0 part /boot/efi
|-nvme0n1p2        259:2    0   488M  0 part /boot
`-nvme0n1p3        259:3    0 952.9G  0 part |-jmk--vg-root   254:0    0  27.9G  0 lvm  /|-jmk--vg-swap_1 254:1    0   976M  0 lvm  [SWAP]|-jmk--vg-home   254:2    0   100G  0 lvm  /home|-jmk--vg-wxy    254:3    0   700G  0 lvm  /wxy|-jmk--vg-docker 254:4    0    30G  0 lvm  /var/lib/docker`-jmk--vg-data   254:5    0    94G  0 lvm  
root@jmk:~/shell# 

检查一致性

root@jmk:~# e2fsck -f /dev/jmk-vg/data 
e2fsck 1.47.0 (5-Feb-2023)
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/jmk-vg/data: 12/6160384 files (0.0% non-contiguous), 533162/24641536 blocks
root@jmk:~# 

调整逻辑边界空间大小

root@jmk:~# resize2fs /dev/jmk-vg/data 10G
resize2fs 1.47.0 (5-Feb-2023)
Resizing the filesystem on /dev/jmk-vg/data to 2621440 (4k) blocks.
The filesystem on /dev/jmk-vg/data is now 2621440 (4k) blocks long.root@jmk:~# 

逻辑卷缩减

root@jmk:~# lvreduce -L 10G /dev/jmk-vg/data WARNING: Reducing active logical volume to 10.00 GiB.THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce jmk-vg/data? [y/n]: ySize of logical volume jmk-vg/data changed from 94.00 GiB (24064 extents) to 10.00 GiB (2560 extents).Logical volume jmk-vg/data successfully resized.
root@jmk:~# 

检查

root@jmk:~# lsblk 
NAME               MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
nvme0n1            259:0    0 953.9G  0 disk 
|-nvme0n1p1        259:1    0   512M  0 part /boot/efi
|-nvme0n1p2        259:2    0   488M  0 part /boot
`-nvme0n1p3        259:3    0 952.9G  0 part |-jmk--vg-root   254:0    0  27.9G  0 lvm  /|-jmk--vg-swap_1 254:1    0   976M  0 lvm  [SWAP]|-jmk--vg-home   254:2    0   100G  0 lvm  /home|-jmk--vg-wxy    254:3    0   700G  0 lvm  /wxy|-jmk--vg-docker 254:4    0    30G  0 lvm  /var/lib/docker`-jmk--vg-data   254:5    0    10G  0 lvm  
root@jmk:~# 

挂载

root@jmk:~# mount /dev/jmk-vg/data /data/
root@jmk:~# df -h
Filesystem                  Size  Used Avail Use% Mounted on
udev                        3.8G     0  3.8G   0% /dev
tmpfs                       767M  3.2M  764M   1% /run
/dev/mapper/jmk--vg-root     28G  4.9G   22G  19% /
tmpfs                       3.8G   84K  3.8G   1% /dev/shm
tmpfs                       5.0M   12K  5.0M   1% /run/lock
/dev/nvme0n1p2              456M   68M  364M  16% /boot
/dev/mapper/jmk--vg-docker   30G  5.0G   23G  18% /var/lib/docker
/dev/mapper/jmk--vg-home     98G  6.5G   87G   7% /home
/dev/mapper/jmk--vg-wxy     688G  181G  473G  28% /wxy
/dev/nvme0n1p1              511M  5.9M  506M   2% /boot/efi
overlay                      30G  5.0G   23G  18% /var/lib/docker/overlay2/f09763168435f4be6ce5adf352d0654ad28506aec40ba4c387a190a364906f9f/merged
overlay                      30G  5.0G   23G  18% /var/lib/docker/overlay2/bab66014a7a556344e6483ba7e3ef7b97b915d669ec37dcef548e0925df51ff6/merged
overlay                      30G  5.0G   23G  18% /var/lib/docker/overlay2/834e9bd560c81d329d3eae63e15305931abaf18d862ceeb3f6b16ac7b3139d47/merged
tmpfs                       767M  4.0K  767M   1% /run/user/1000
/dev/mapper/jmk--vg-data    9.4G   32K  8.8G   1% /data
root@jmk:~# ls /data/
log.txt  lost+found
root@jmk:~# 

可以看到，此时容量已经调整，并且文件依旧存在