Linux - convert Ext2 to Ext3

This is commands to convert Ext2 to Ext3. This example if using volgroups

# tune2fs -j /dev/vgname/lvname

or if using disk /dev/sda

# tune2fs -j/dev/sda

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If something wrong happened, such as unable to bootup after converted.

Like what happened to me : "kernel panic, unknown ext3 partition"

Convert back from Ext3 to Ext2.

- boot up system using "rescue" mode from installation cd

# tune2fs -O ^has_journal /dev/vgname/lvname

# e2fsck /dev/vgname/lvname

- reboot