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Implementing UFS Journaling on a Desktop PC
<email>manolis@FreeBSD.org</email>
<personname><firstname>Manolis</firstname><surname>Kiagias</surname></personname><affiliation> <_:address-1/> </affiliation>
<year>2008</year> <holder role="mailto:manolis@FreeBSD.org">Manolis Kiagias</holder>
$FreeBSD: head/en_US.ISO8859-1/articles/gjournal-desktop/article.xml 51348 2017-12-30 22:56:56Z eadler $
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A journaling file system uses a log to record all transactions that take place in the file system, and preserves its integrity in the event of a system crash or power failure. Although it is still possible to lose unsaved changes to files, journaling almost completely eliminates the possibility of file system corruption caused by an unclean shutdown. It also shortens to a minimum the time required for after-failure file system checking. Although the UFS file system employed by FreeBSD does not implement journaling itself, the new journal class of the GEOM framework in FreeBSD 7.<replaceable>X</replaceable> can be used to provide file system independent journaling. This article explains how to implement UFS journaling on a typical desktop PC scenario.
Introduction
While professional servers are usually well protected from unforeseen shutdowns, the typical desktop is at the mercy of power failures, accidental resets, and other user related incidents that can lead to unclean shutdowns. Soft Updates usually protect the file system efficiently in such cases, although most of the times a lengthy background check is required. On rare occasions, file system corruption reaches a point where user intervention is required and data may be lost.
The new journaling capability provided by GEOM can greatly assist in such scenarios, by virtually eliminating the time required for file system checking, and ensuring that the file system is quickly restored to a consistent state.
This article describes a procedure for implementing UFS journaling on a typical desktop PC scenario (one hard disk used for both operating system and data). It should be followed during a fresh installation of FreeBSD. The steps are simple enough and do not require overly complex interaction with the command line.
After reading this article, you will know:
How to reserve space for journaling during a new installation of FreeBSD.
How to load and enable the <literal>geom_journal</literal> module (or build support for it in your custom kernel).
How to convert your existing file systems to utilize journaling, and what options to use in <filename>/etc/fstab</filename> to mount them.
How to implement journaling in new (empty) partitions.

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(itstool) path: affiliation/address

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article.translate.xml:8
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Source string age
a year ago
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articles/gjournal-desktop.pot, string 3