How to Remove a Logical Volume on CentOS 6.3/RHEL6

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

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