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For more information about journaling, please read the manual page of <citerefentry><refentrytitle>gjournal</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
Steps During the Installation of FreeBSD
Reserving Space for Journaling
A typical desktop machine usually has one hard disk that stores both the OS and user data. Arguably, the default partitioning scheme selected by <application>sysinstall</application> is more or less suitable: A desktop machine does not need a large <filename>/var</filename> partition, while <filename>/usr</filename> is allocated the bulk of the disk space, since user data and a lot of packages are installed into its subdirectories.
The default partitioning (the one obtained by pressing <keycap>A</keycap> at the FreeBSD partition editor, called <application>Disklabel</application>) does not leave any unallocated space. Each partition that will be journaled, requires another partition for the journal. Since the <filename>/usr</filename> partition is the largest, it makes sense to shrink this partition slightly, to obtain the space required for journaling.
In our example, an 80 GB disk is used. The following screenshot shows the default partitions created by <application>Disklabel</application> during installation:
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external ref='disklabel1' md5='__failed__'
If this is more or less what you need, it is very easy to adjust for journaling. Simply use the arrow keys to move the highlight to the <filename>/usr</filename> partition and press <keycap>D</keycap> to delete it.
Now, move the highlight to the disk name at the top of the screen and press <keycap>C</keycap> to create a new partition for <filename>/usr</filename>. This new partition should be smaller by 1 GB (if you intend to journal <filename>/usr</filename> only), or 2 GB (if you intend to journal both <filename>/usr</filename> and <filename>/var</filename>). From the pop-up that appears, opt to create a file system, and type <filename>/usr</filename> as the mount point.
Should you journal the <filename>/var</filename> partition? Normally, journaling makes sense on quite large partitions. You may decide not to journal <filename>/var</filename>, although doing so on a typical desktop will cause no harm. If the file system is lightly used (quite probable for a desktop) you may wish to allocate less disk space for its journal.
In our example, we journal both <filename>/usr</filename> and <filename>/var</filename>. You may of course adjust the procedure to your own needs.

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