[root@localhost ~]# lvreduce -L -4M /dev/vg0/yahoo 减少4MB
/dev/cdrom: open failed: 只读文件系统
WARNING: Reducing active and open logical volume to 12.00 MB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce yahoo? [y/n]: y
Reducing logical volume yahoo to 12.00 MB
Logical volume yahoo successfully resized
[root@localhost ~]# lvscan 再次查看逻辑卷已经减少
ACTIVE '/dev/vg0/yahoo' [12.00 MB] inherit