Linux reduced file system size LVM

Linux reduced file system size LVM

• Lab Environment:

(1) Operating system: centos6.7 i686

(2) VMware Workstation version 12

(3) Experimental hard disk size 5G

• First look at the current disk usage:

650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M01/93/4C/wKioL1kJ5V3TVDr2AAAXmG3iAuY048.png "title=" 11. PNG "alt=" Wkiol1kj5v3tvdr2aaaxmg3iauy048.png "/>

• Increase the virtual hard disk size to 5G:

650) this.width=650; "src=" Https://s5.51cto.com/wyfs02/M00/93/4D/wKiom1kJ5szy6vmbAABIK_QIvYM445.png "title=" 11. PNG "alt=" Wkiom1kj5szy6vmbaabik_qivym445.png "/>

• To create a file system:

650) this.width=650; "src=" Https://s4.51cto.com/wyfs02/M00/93/4C/wKioL1kJ5z_Q6mX-AAANM_x6f0g985.png "title=" 11. PNG "alt=" Wkiol1kj5z_q6mx-aaanm_x6f0g985.png "/>

(1) The main steps are as follows:

650) this.width=650; "src=" Https://s2.51cto.com/wyfs02/M01/93/4E/wKiom1kJ596TSeZBAAAy81HzfBY629.png "title=" 11. PNG "alt=" Wkiom1kj596tsezbaaay81hzfby629.png "/>

(2) Formatting:

#mkfs. EXT4/DEV/VG_WTF/LV_WTF

(3) Mount:

#mkdir/WTF #建立挂载目录

#mount/DEV/VG_WTF/LV_WTF/WTF

(4) Check the current disk usage as follows:

650) this.width=650; "src=" Https://s4.51cto.com/wyfs02/M00/93/4C/wKioL1kJ6VnRkQZRAAArVYaOPHA541.png "title=" 11. PNG "alt=" Wkiol1kj6vnrkqzraaarvyaopha541.png "/>

Note: It is recommended to write the new file system to the/etc/fstab configuration file!

• Now we're going to shrink the/dev/vg_wtf/lv_wtf to 2G.

(1) Uninstalling/WTF

Command: #umount/WTF

(2) resizing the partition

[Email protected] ~]# resize2fs-p/DEV/VG_WTF/LV_WTF 2G

If prompted: "Please run ' e2fsck-f/dev/vg_wtf/lv_wtf ' first." The

[Email protected] ~]# e2fsck-f/DEV/VG_WTF/LV_WTF

As follows:

650) this.width=650; "src=" Https://s5.51cto.com/wyfs02/M01/93/4D/wKioL1kJ66eARAI0AAAwFJT39mk348.png "title=" 11. PNG "alt=" Wkiol1kj66earai0aaawfjt39mk348.png "/>

[Email protected] ~]# resize2fs-p/DEV/VG_WTF/LV_WTF 2G

As follows:

650) this.width=650; "src=" Https://s5.51cto.com/wyfs02/M01/93/4D/wKioL1kJ7BLyNOVrAAAuVUto9Vw126.png "title=" 11. PNG "alt=" Wkiol1kj7blynovraaauvuto9vw126.png "/>

(3) Mount the/WTF to view disk usage

[Email protected] ~]# MOUNT/DEV/VG_WTF/LV_WTF/WTF

[Email protected] ~]# df-h

As follows:

650) this.width=650; "src=" Https://s4.51cto.com/wyfs02/M02/93/4E/wKiom1kJ7RjzW6F8AAAkGuYB-2Y818.png "title=" 11. PNG "alt=" Wkiom1kj7rjzw6f8aaakguyb-2y818.png "/>

However, when using VGS to view the remaining capacity, the display is still 0, as follows:

650) this.width=650; "src=" Https://s2.51cto.com/wyfs02/M02/93/4D/wKioL1kJ7cCzk3KDAAANAxMWBE8289.png "title=" 11. PNG "alt=" Wkiol1kj7cczk3kdaaanaxmwbe8289.png "/>

(4) Set free space

Use the Lvreduce directive to reduce the amount of space that LVM logical volumes occupy. Data already on the logical volume may be deleted, so before the operation

Confirmation must be made. Remember to enter "Y"!

[Email protected] ~]# lvreduce-l 2G/DEV/VG_WTF/LV_WTF

As follows:

650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M00/93/4F/wKiom1kJ7uXiOv-9AAAu9Mgo6ts815.png "title=" 11. PNG "alt=" Wkiom1kj7uxiov-9aaau9mgo6ts815.png "/>

Note:

1) lvreduce-l 20G means to set the current file system to 20G if lvreduce-l 20G refers to reducing 20G from the current file system.

2) Use Lvreduce to reduce the size of the logical volume, smaller than the size of the file, or the data will be lost.

(5) View VGS remaining capacity again

[Email protected] ~]# VGS

As follows:

650) this.width=650; "src=" Https://s4.51cto.com/wyfs02/M02/93/4F/wKiom1kJ76ehc4hSAAAQ5u6dIGg997.png "title=" 11. PNG "alt=" Wkiom1kj76ehc4hsaaaq5u6digg997.png "/>

This article is from the "Hand of the Paladin Control" blog, please make sure to keep this source http://wutengfei.blog.51cto.com/10942117/1921780

Linux reduced file system size LVM