how to rename LV's command line

[Tony Escujuri]

Hi all,

How do I rename a logical volume command line.

Example:
/dev/vg02/lvol1b

Thanks and Best Regards.
Tony Escujuri

[Michael Tully]

Hi,

I don't believe that this can be done. You
would need to backup the existing logical
volume, remove it and recreate it.

1. Backup the volume
2. Remove the volume using
'lvremove /dev/vg02/lvol1b'

3. Re-create your volume
'lvcreate -n /dev/vg02'
'lvextend -L /dev/vg02/newname'

4. Do your restore

HTH
-Michael

[James R. Ferguson · Accepted solution]

Hi Tony:

If all you want is to renmae the logical volume, do this:

# umount mountpoint

# mv /dev/vgXX/oldname /dev/vgXX/newname
# mv /dev/vgXX/roldname /dev/vgXX/rnewname

...NOTE both the block and the raw device file names are changed...

# (Edit /etc/fstab to reflect the 'newname' for the 'mountpoint')

# mount -a

Regards!

...JRF...

[Animesh Chakraborty]

Hi,
I have tested JRF's steps.
It works!!

Regards
Animesh

[Michael Tully]

Well doggonnnn.... You learn something everyday!

Thanks Jim... I didn't think it could be done

Cheers
-Michael

[Bill Hassell]

lvols can always be renamed, but vg's cannot as the name is not only a directory but the name is stored in lvmtab and other structures. The ability to rename lvols is one of the reasons that vgexport can be used without a mapfile to create the default names, then just mv them to the desired names.

[Tony Escujuri]

That worked thanks for the help.... you guys are the greatest!!

Regards,
Tony Escujuri

[Roger Baptiste]

Tony,

A caveat:

When a raw logical volume needs to be renamed, it has to be made sure that it
is not being used by running:
fuser /dev/vgname/lvolname

-> if this lists pid's using it , then
the processes need to be identified and
either be killed or gracefully removed.

Only when the raw volume is not being used,
should it be renamed. I have seen a DBA
get into big trouble at work by renaming a
live db raw volume.

For a filesystem lv, it's a different story,
since the Filesystem unmount automatically
ensures the LV is not being used.

-raj