1 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 geom_journal 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 /etc/fstab to mount them.

• How to implement journaling in new (empty) partitions.

• How to troubleshoot common problems associated with journaling.

Before reading this article, you should be able to:

• Understand basic UNIX® and FreeBSD concepts.

• Be familiar with the installation procedure of FreeBSD and the sysinstall utility.