Logical Volume Removal

In this KB, we will show you how to remove a logical volume.  We will assume you already have a logical volume (LV) created on your system.  If you do not already have a LV, and you need help creating your first LV, please see our LVM Configuration KB for details.

Removing a logical volume is a three step process:

1. Unmount the LV
2. Remove the LV
   
3. Update /etc/fstab

Note: Make sure you unmount the file system before removing the LV.  Forcing the removal of a LV before it is unmounted could have unknown consequences on your system.

In the following example, we will remove the logical volume TCPDumpLV.  Lets get started!

1. Begin by listing all the logical volumes on the system
   
   

   [root@Linux01 ~]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert TCPDumpLV TCPDumpVolGRP -wi-ao 2.00G LogVol00 VolGroup00 -wi-ao 1.00G LogVol01 VolGroup00 -wi-ao 1.94G LogVol02 VolGroup00 -wi-ao 1.00G LogVol03 VolGroup00 -wi-ao 2.00G LogVol04 VolGroup00 -wi-ao 3.94G [root@Linux01 ~]#

   
   
2. Let's find out where TCPDumpLV is mounted
   
   

   [root@Linux01 ~]# df -kh Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol04 3.9G 2.2G 1.6G 59% / /dev/sda1 99M 12M 82M 13% /boot tmpfs 1006M 0 1006M 0% /dev/shm /dev/mapper/VolGroup00-LogVol00 992M 41M 901M 5% /home /dev/mapper/VolGroup00-LogVol02 992M 69M 872M 8% /tmp /dev/mapper/VolGroup00-LogVol03 2.0G 150M 1.7G 8% /var /dev/mapper/TCPDumpVolGRP-TCPDumpLV 2.0G 568M 1.4G 30% /Data

   Note: TCPDumpLV is mounted on /Data
   
   
3. Unmount TCDDumpLV
   
   

   [root@Linux01 /]# umount /Data [root@Linux01 /]#

   
   
4. Remove the logical volume
   
   

   [root@Linux01 /]# lvremove /dev/TCPDumpVolGRP/TCPDumpLV Do you really want to remove active logical volume "TCPDumpLV"? [y/n]: y Logical volume "TCPDumpLV" successfully removed [root@Linux01 /]#

   
   
5. Verify the logical volume has been removed
   
   

   [root@Linux01 ~]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert LogVol00 VolGroup00 -wi-ao 1.00G LogVol01 VolGroup00 -wi-ao 1.94G LogVol02 VolGroup00 -wi-ao 1.00G LogVol03 VolGroup00 -wi-ao 2.00G LogVol04 VolGroup00 -wi-ao 3.94G [root@Linux01 ~]#

   
   
6. Update /etc/fstab to reflect the removal of the file system
   
   

   /dev/mapper/TCPDumpVolGRP-TCPDumpLV /Data ext3 defaults 0 0

Nice work, you now know how to remove a logical volume!

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Anonymous |05/02/2012 03:50:06 It's really wonderful i followed it step by step & remove lv's at my office production system.Thanks a lot!! Reply | Quote

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