Changing LV name online

Yes. We can change the LV name online in AIX 6.1 TL4.

Usually we will unmount the LV to rename it. But AIX 6.1 TL4 helps us to change the name of the logical volume online.

Steps:

1) Check the oslevel that it is in 6.1 TL4 (Just to ensure).

# oslevel -s

6100-04-01-0944

2) Note down the original LV name

# df -m /home/nmon

Filesystem    MB blocks      Free %Used    Iused %Iused Mounted on

/dev/nmonlv      256.00    254.73    1%       23     1% /home/nmon

# lsvg -l rootvg | grep nmon

nmonlv              jfs2       1       1       1    open/syncd    /home/nmon

3) Now, change the LV name without unmounting it.

# chlv -n nmon_lv nmonlv

Note that df output will not show us any change until we remount the file system. But we can see the new LV name in /etc/filesystems and “lsvg –l rootvg” outputs.

# df -m /home/nmon

Filesystem    MB blocks      Free %Used    Iused %Iused Mounted on

/dev/nmonlv      256.00    254.73    1%       23     1% /home/nmon

# lsvg -l rootvg | grep nmon

nmon_lv             jfs2       1       1       1    open/syncd    /home/nmon

# grep -p nmon /etc/filesystems

/home/nmon:

        dev             = /dev/nmon_lv

        vfs             = jfs2

        log             = /dev/hd8

        mount           = true

        options         = rw

        account         = false

        quota           = no

4) After remounting the filesystem, the df command now displayed the new LV name. 

# umount /home/nmon

# mount /home/nmon

# df /home/nmon

Filesystem    512-blocks      Free %Used    Iused %Iused Mounted on

/dev/nmon_lv      524288    521696    1%       23     1% /home/nmon