In previous post, i have cover the steps to create additional Logical volume manager (LVM). In certain situation, linux administrator is required to remove the existing logical volume. It is possible to perform the required task if that system administrator has the right skill on linux. Otherwise, they will put themselves and the organization in the disaster or risk as this working with the system’s data. This post assumed centos63_vol has been created and will be remove later. In summary, removing a logical volume (centos63_vol) will involve the following processes:
a) Unmount the LV
b) Remove the LV
c) Update /etc/fstab
1. Begin by listing all the logical volumes on the system :
[root@centos63 ~]# lvs LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert lv_root vg_centos63 -wi-ao-- 5.54g lv_swap vg_centos63 -wi-ao-- 1.97g centos63_vol vg_data -wi-ao-- 4.99g
2. Check current disk layout and find where centos63_vol is mounted :
[root@centos63 ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos63-lv_root
5.5G 2.2G 3.1G 41% /
tmpfs 504M 0 504M 0% /dev/shm
/dev/sda1 485M 65M 395M 15% /boot
/dev/mapper/vg_data-centos63_vol
5.0G 139M 4.6G 3% /mydata
3. View current /etc/fstab value :
[root@centos63 ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Sun Jul 15 20:17:38 2012 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/vg_centos63-lv_root / ext4 defaults 1 1 UUID=2217c7b1-4467-4c81-8596-c3ee7758e2cc /boot ext4 defaults 1 2 /dev/mapper/vg_centos63-lv_swap swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/vg_data/centos63_vol /mydata ext4 defaults 1 1
4. Unmount centos63_vol (mounted at /mydata) :
[root@centos63 ~]# umount /mydata
5. Verify that centos63_vol has unmounted :
[root@centos63 ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos63-lv_root
5.5G 2.2G 3.1G 41% /
tmpfs 504M 0 504M 0% /dev/shm
/dev/sda1 485M 65M 395M 15% /boot
6. Remove the logical volume /dev/mapper/vg_data-centos63_vol :
[root@centos63 ~]# lvremove /dev/mapper/vg_data-centos63_vol Do you really want to remove active logical volume centos63_vol? [y/n]: y Logical volume "centos63_vol" successfully removed
7. Verify the logical volume has been removed :
[root@centos63 ~]# lvs LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert lv_root vg_centos63 -wi-ao-- 5.54g lv_swap vg_centos63 -wi-ao-- 1.97g [root@centos63 ~]#
8. Update /etc/fstab to reflect the removal of the file system :
[root@centos63 ~]# vi /etc/fstab
# # /etc/fstab # Created by anaconda on Sun Jul 15 20:17:38 2012 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/vg_centos63-lv_root / ext4 defaults 1 1 UUID=2217c7b1-4467-4c81-8596-c3ee7758e2cc /boot ext4 defaults 1 2 /dev/mapper/vg_centos63-lv_swap swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0