LVS_home目录缩减

实验环境

                虚拟机软件：VMware Workstation

                操作系统：Read Hat Enteprise 6.3

注意：    1、不能在线缩减，得先卸载；

              2、确保缩减后的空间大小依然能存储原有的所有数据；

              3、在缩减之前应该先强行检查文件，以确保文件系统处于一致性状态；  

1.查看home磁盘映射的位置 
[ root@template ~]# mount 
/dev/mapper/vg_template-lv_root on / type ext4 (rw) 
proc on /proc type proc (rw) 
sysfs on /sys type sysfs (rw) 
devpts on /dev/pts type devpts (rw,gid=5,mode=620) 
tmpfs on /dev/shm type tmpfs (rw) 
/dev/sda1 on /boot type ext4 (rw) 
/dev/mapper/vg_template-lv_home on /home type ext4 (rw) 
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) 
/dev/sr0 on /media type iso9660 (ro) 
2.卸载home目录 
[ root@template ~]# umount /dev/mapper/vg_template-lv_home 
3.检查home文件目录 
[ root@template ~]# e2fsck /dev/mapper/vg_template-lv_home 
e2fsck 1.41.12 (17-May-2010) 
/dev/mapper/vg_template-lv_home: clean, 11/6553600 files, 459349/26214400 blocks 
4.缩小home文件目录 
[ root@template ~]# resize2fs -f /dev/mapper/vg_template-lv_home 5G 
resize2fs 1.41.12 (17-May-2010) 
Resizing the filesystem on /dev/mapper/vg_template-lv_home to 1310720 (4k) blocks. 
The filesystem on /dev/mapper/vg_template-lv_home is now 1310720 blocks long. 
5.缩小home的lv 
[ root@template ~]# lvreduce -L 5G /dev/mapper/vg_template-lv_home 
WARNING: Reducing active logical volume to 5.00 GiB 
THIS MAY DESTROY YOUR DATA (filesystem etc.) 
Do you really want to reduce lv_home? [y/n]: y 
Reducing logical volume lv_home to 5.00 GiB 
Logical volume lv_home successfully resized 
6.查看lv 
[ root@template ~]# lvs 
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert 
lv_home vg_template -wi-a--- 5.00g 
lv_root vg_template -wi-ao-- 50.00g 
lv_swap vg_template -wi-ao-- 1.94g 
7.挂载home目录 
[ root@template ~]# mount -a 
8.检查home目录的大小 
[ root@template ~]# df -h 
Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_template-lv_root 
50G 1.4G 46G 3% / 
tmpfs 242M 0 242M 0% /dev/shm 
/dev/sda1 485M 32M 429M 7% /boot 
/dev/sr0 3.5G 3.5G 0 100% /media 
/dev/mapper/vg_template-lv_home 
5.0G 160M 4.6G 4% /home

来自为知笔记(Wiz)