Learn how to rename logical volume in Linux or Unix. Understand what happens in the background when you change the logical volume name of existing LVOL.
LVM i.e. logical volume manager is one of the widely used volume managers in Linux and Unix. A logical volume is a portion of the volume group which can be mounted on a mount point. Once mounted, space belonging to that logical volume is available for use to end-user.
In this post, we are going to see step by step how to rename logical volume. In Linux,
lvrename is a direct command which does this stuff for you. But first, we will see how it works in the background so that you know the flow and you can rename LV even without
LV renaming procedure follows below flow :
- Stop all user/app access to related mount point (on which lvol is mounted) using
- Un-mount LV using
- Rename device names of lvol using
- Mount LV using
- Edit /etc/fstab entry related to this lvol using
Let’s see an example where we are renaming
/dev/vg01/lvol1 which is mounted on
/dev/vg01/lvol_one. See the below output for the above-mentioned steps (HPUX console).
# bdf /data /dev/vg01/lvol1 524288 49360 471256 9% /data # fuser -cku /data /data: 223412c(user1) # umount /data # mv /dev/vg01/lvol1 /dev/vg01/lvol_one # mv /dev/vg01/rlvol1 /dev/vg01/rlvol_one # mount /data # bdf /data /dev/vg01/lvol_one 524288 49360 471256 9% /data
In the above output, you can see how we renamed logical volume just by renaming its device files.
In Linux, we have a single command
lvrename which do all the above steps in the background for you. You just need to provide it with old and new lvol names along with the volume group where this lvol belongs. So, the above scenario will have below command –
# lvrename vg01 lvol1 lvol_one Renamed "lvol1" to "lvol_one" in volume group "vg01"
You can see in the output that single command renamed lvol1 to lvol_one! This command also supports below option :
Your information is helpful. I need to know that I need to rename file system /oradata to /oradata_old and use new file /oradata1 lets say. Can I simply change /oradata with mv /dev/mapper/1500g-oradata/oradata /dev/mapper/1500g-oradata/oradata_old. Please share your help on this.
/dev/mapper/1500g-oradata 1548046564 1065192004 404194976 73% /oradata
Shrikant Lavhate says
Hope I understood correctly. You need /oradata to be /oradata1.
VG name is 1500g and LV name is oradata
# mkdir /oradata1
# umount /oradata (Make sure /oradata is not being accesses by anyone with fuser)
# mount /dev/1500g/oradata /oradata1
Edit /etc/fstab to make change permanent over reboot.