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90 Chapter 5. The ext3 File System

Once you have assigned each partition a label, add the partitions to /etc/fstab. To do this, log in

as root and type:

pico -w /etc/fstab

Then add a line to /etc/fstab for each labeled partition similar to this:

LABEL=/mount/point /mount/point ext3 defaults 1 2

In the above entry in /etc/fstab, replace each occurrence of /mount/point with the mount

point you intend to use for the partition.

If you need more information on the various options available to you in /etc/fstab, type man

fstab.

If there are partitions whose label you are unsure of, type the following command:

/sbin/tune2fs -l /dev/hdbX |grep volume

In the above command, replace hdb with the drive letter and X with the partition number.

This will return something similar to the output below:

Filesystem volume name: /mount/point

In this output, /mount/point is the volume label.

After completing the above steps, you will have successfully added a new ext3 disk to the system. The

next section demonstrates how to convert an ext2 disk partition to an ext3 partition.

5.3. Converting to an ext3 File System

The tune2fs program can add a journal to an existing ext2 ﬁle system without altering the data

already on the partition. If the ﬁle system is already mounted while it is being transitioned, the journal

will be visible as the ﬁle .journal in the root directory of the ﬁle system. If the ﬁle system is not

mounted, the journal will be hidden and will not appear in the ﬁle system at all.

To convert an ext2 ﬁle system to ext3, log in as root and type:

/sbin/tune2fs -j /dev/hdbX

In the above command, replace hdb with the drive letter and X with the partition number.

After doing this, be certain to change the partition type from ext2 to ext3 in /etc/fstab.

If you are transitioning your root ﬁle system, you will have to use an initrd image (or RAM disk) to

boot. To create this, run the mkinitrd program. For information on using the mkinitrd command,

type man mkinitrd. Also make sure your LILO or GRUB conﬁguration loads the initrd.

If you fail to make this change, the system will still boot, but the root ﬁle system will be mounted as

ext2 instead of ext3.

5.4. Reverting to an ext2 File System

Because ext3 is relatively new, some disk utilities do not yet support it. For example, you may need

to shrink a partition with resize2fs, which does not yet support ext3. In this situation, it may be

necessary to temporarily revert a ﬁle system to ext2.

To revert a partition, you must ﬁrst unmount the partition by logging in as root and typing:

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 90