11.8. Convert from ext3 to ext4 File system

step 1

$ sudo tune2fs -O extents,uninit_bg,dir_index /dev/sda7
tune2fs 1.41.4 (27-Jan-2009)

Please run e2fsck on the filesystem.
		

step 2

		
$ sudo e2fsck -fD /dev/sda7
e2fsck 1.41.4 (27-Jan-2009)
/dev/sda7 is mounted.

WARNING!!!  Running e2fsck on a mounted filesystem may cause
SEVERE filesystem damage.

Do you really want to continue (y/n)? yes

/dev/sda7: recovering journal
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 3A: Optimizing directories
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences:  -3913734 +3925302
Fix<y>? yes


/dev/sda7: ***** FILE SYSTEM WAS MODIFIED *****
/dev/sda7: 77282/2293760 files (15.7% non-contiguous), 4584313/9163066 blocks
		
		

step 3

$ sudo cp /etc/fstab /etc/fstab.old
$ sudo vim /etc/fstab

# /dev/sda7
UUID=16089544-6fbf-400e-a63a-fa6159e271e5 /home           ext4    relatime,errors=remount-ro 0 1
		

step 4

$ sudo reboot
		

原文出处：Netkiller 系列 手札
本文作者：陈景峯
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