今天就跟大家聊聊有关lvm收缩逻辑卷空间是怎样的，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
[root@cspserver1 /]# umount /softdata
[root@cspserver1 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/RHELVG-ROOT
15G 12G 2.6G 82% /
tmpfs 16G 7.8G 8.0G 50% /dev/shm
/dev/sda1 190M 40M 141M 23% /boot
/dev/mapper/RHELVG-HOME
20G 55M 19G 1% /home
/dev/mapper/RHELVG-OPT
15G 13G 1.2G 92% /opt
/dev/mapper/RHELVG-TMP
15G 44M 14G 1% /tmp
/dev/mapper/RHELVG-USR
15G 3.8G 11G 28% /usr
/dev/mapper/RHELVG-VAR
15G 261M 14G 2% /var
[root@cspserver1 /]# e2fsck -f /dev/mapper/RHELVG-SOFTDATA
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/RHELVG-SOFTDATA: 11/2559088 files (0.0% non-contiguous), 205643/10232832 blocks
[root@cspserver1 /]# resize2fs /dev/mapper/RHELVG-SOFTDATA 10240m （文件系统缩到10g）
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/RHELVG-SOFTDATA to 2621440 (4k) blocks.
The filesystem on /dev/mapper/RHELVG-SOFTDATA is now 2621440 blocks long.
is already 2621440 blocks long. Nothing to do!
[root@cspserver1 /]# lvreduce -L 10240m /dev/mapper/RHELVG-SOFTDATA （再缩lv）
WARNING: Reducing active logical volume to 10.00 GiB.
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce RHELVG/SOFTDATA? [y/n]: y
Size of logical volume RHELVG/SOFTDATA changed from 39.04 GiB (9993 extents) to 10.00 GiB (2560 extents).
Logical volume SOFTDATA successfully resized.
[root@cspserver1 /]# mount /dev/mapper/RHELVG-SOFTDATA /softdata
[root@cspserver1 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/RHELVG-ROOT
15G 12G 2.6G 82% /
tmpfs 16G 7.8G 8.0G 50% /dev/shm
/dev/sda1 190M 40M 141M 23% /boot
/dev/mapper/RHELVG-HOME
20G 55M 19G 1% /home
/dev/mapper/RHELVG-OPT
15G 13G 1.2G 92% /opt
/dev/mapper/RHELVG-TMP
15G 44M 14G 1% /tmp
/dev/mapper/RHELVG-USR
15G 3.8G 11G 28% /usr
/dev/mapper/RHELVG-VAR
15G 261M 14G 2% /var
/dev/mapper/RHELVG-SOFTDATA
9.8G 36M 9.2G 1% /softdata
[root@cspserver1 /]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 RHELVG lvm2 a--u 149.80g 29.04g
[root@cspserver1 /]# lvextend -L +20480M /dev/mapper/RHELVG-OPT (扩展逻辑卷)
Size of logical volume RHELVG/OPT changed from 15.00 GiB (3840 extents) to 35.00 GiB (8960 extents).
Logical volume OPT successfully resized.
[root@cspserver1 /]# resize2fs /dev/mapper/RHELVG-OPT （将扩展的逻辑卷同步到文件系统）
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/RHELVG-OPT is mounted on /opt; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 3
Performing an on-line resize of /dev/mapper/RHELVG-OPT to 9175040 (4k) blocks.
The filesystem on /dev/mapper/RHELVG-OPT is now 9175040 blocks long.
[root@cspserver1 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/RHELVG-ROOT
15G 12G 2.6G 82% /
tmpfs 16G 7.8G 8.0G 50% /dev/shm
/dev/sda1 190M 40M 141M 23% /boot
/dev/mapper/RHELVG-HOME
20G 55M 19G 1% /home
/dev/mapper/RHELVG-OPT
35G 13G 20G 40% /opt
/dev/mapper/RHELVG-TMP
15G 44M 14G 1% /tmp
/dev/mapper/RHELVG-USR
15G 3.8G 11G 28% /usr
/dev/mapper/RHELVG-VAR
15G 261M 14G 2% /var
/dev/mapper/RHELVG-SOFTDATA
9.8G 36M 9.2G 1% /softdata
[root@cspserver1 /]#
看完上述内容，你们对lvm收缩逻辑卷空间是怎样的有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注编程网行业资讯频道，感谢大家的支持。
