Logical Volume Renaming

In this KB, we will show you how to rename 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.

Renaming a logical volume is a three step process:

1. Rename the LV
2. Remount the file system
3. Update /etc/fstab

Remounting the file system is necessary in order for the user space to see the name change.

Note: The output of the df command will not display the new name of the file system until it has been remounted.

In the following example, we will rename the logical volume DataLV to 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 DataLV 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 DataLV 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-DataLV 2.0G 568M 1.4G 30% /Data

   Note: The DataLV is mounted on /Data
   
   
3. Rename DataLV to TCPDumpLV
   
   

   [root@Linux01 /]# lvrename TCPDumpVolGRP DataLV TCPDumpLV Renamed "DataLV" to "TCPDumpLV" in volume group "TCPDumpVolGRP" [root@Linux01 /]#

   
   
4. Verify the logical volume has been renamed
   
   

   [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 ~]#

   
   
5. Notice the user space has yet to be updated, this is because the file system must be remounted
   
   

   [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-DataLV 2.0G 568M 1.4G 30% /Data

   
   
6. Remount the file system to update the user space
   
   

   [root@Linux01 /]# umount /dev/mapper/TCPDumpVolGRP-DataLV [root@Linux01 /]# mount /dev/TCPDumpVolGRP/TCPDumpLV /Data/ [root@Linux01 /]#

   
   
7. Verify the file system has been 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

   
   
8. Update /etc/fstab to reflect the new name of the file system
   
   

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

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

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James  - Great walk through! |30/03/2012 05:07:04 Thanks for the walk through, it really helped me! Special note when renaming the boot or any boot-sensitive partitions Be sure to edit your boot loader’s sequence like in /boot/grub/menu.lst because it uses that info!! If you forget, grab a rescue cd and get to work Reply | Quote

pinguim  - LVrename problem |22/11/2012 04:29:27 Hello, I am with a big problem...I lvrename a lv, but I did not change the directory of the partition, when I rename the particion name directory, the linux is saind that the special device does not exists Can you help me? Reply | Quote

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