| 1 | <sect1 id="postlfs-filesystems-ext3">
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| 2 | <?dbhtml filename="ext3.html"?>
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| 3 | <title>Ext3</title>
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| 4 |
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| 5 | <para>Ext3 is a journaling file system that is an extension to the ext2
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| 6 | file system. It is backward compatible with ext2 and the conversion from ext2
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| 7 | to ext3 is trivial.</para>
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| 8 |
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| 9 | <para>You don't need to install anything to use ext3, all the required
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| 10 | packages are available with a bare <acronym>LFS</acronym> system.</para>
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| 11 |
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| 12 | <para>When building the kernel, ensure that you have compiled in ext3
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| 13 | support. If you want your root partition to be ext3, then compile the ext3
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| 14 | support in the kernel, else you may compile it as a module. Recompile the
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| 15 | kernel if needed.</para>
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| 16 |
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| 17 | <para>Edit your <filename>/etc/fstab</filename>. For each partition that you
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| 18 | want to convert into ext3, edit the entry so that it looks similar to the
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| 19 | following line.</para>
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| 20 |
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| 21 | <screen>/dev/hd<replaceable>XX</replaceable> /mnt_point ext3 defaults 1 0</screen>
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| 22 |
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| 23 | <para>In the above line, replace
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| 24 | <filename>/dev/hd<replaceable>XX</replaceable></filename> by the
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| 25 | partition (e.g. <filename>/dev/hda2</filename>),
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| 26 | <filename class="directory">/mnt_point</filename> by the mount point (e.g.
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| 27 | <filename class="directory">/home</filename>). The <option>0</option> in the
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| 28 | last field ensures that the partition will not be checked for
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| 29 | consistency during the boot process by the <command>checkfs</command> script.
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| 30 | You may replace the <option>ext3</option> fs type in the above by
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| 31 | <option>auto</option> if you want to ensure that the partition is mounted
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| 32 | if you accidentally skip enabling the ext3 support in the kernel.</para>
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| 33 |
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| 34 | <para>For each partition that you have converted to ext3 in <filename>
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| 35 | /etc/fstab</filename>, enable the journal for the partition by running the
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| 36 | following command.</para>
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| 37 |
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| 38 | <screen><userinput><command>tune2fs -j /dev/hd<replaceable>XX</replaceable></command></userinput></screen>
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| 39 |
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| 40 | <para>Remount the concerned partitions, or simply reboot if you have
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| 41 | recompiled the kernel to enable ext3 support.</para>
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| 42 |
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| 43 | <para>More information is available at <ulink
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| 44 | url="http://www.zip.com.au/~akpm/linux/ext3/ext3-usage.html"/>.</para>
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| 45 |
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| 46 | </sect1>
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