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Journaling is supported in the Linux kernel with ext3. The ext3 file system is also fully compatible with the earlier ext2 version it replaces. To create an ext3 file system, you use the mkfs.ext3 command. You can even upgrade ext2 file systems to ext3 versions automatically, with no loss of data or change in partitions. This upgrade just adds a journal file to an ext2 file system and enables journaling on it, using the tune2fs command. Be sure to change the ext2 file type to ext3 in any corresponding /etc/fstab entries. The following example converts the ext2 file system on /dev/hda3 to an ext3 file system by adding a journal file (-j). tune2fs -j /dev/hda3 Though the ext3 file system maintains full metadata recovery support (directory tree recovery), it offers various levels of file data recovery. In effect, you are trading off less file data recovery for more speed. The ext3 file system supports three options: writeback, ordered, and journal. The default is writeback. The writeback option provides only metadata recovery, no file data recovery. The ordered option supports limited file data recovery, and the journal option provides for full file data recovery. Any files in the process of being changed during a crash will be recovered. To specify a ext3 option, use the data option in the mount command. data=ordered
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Though journaling is often used to recover from disk crashes, a journal-based file system can do much more. The ext3, JFS, and XFS file systems only provide the logging operations used in recovery, whereas ReiserFS uses journaling techniques to completely rework file system operations. In ReiserFS, journaling is used to read and write data, abandoning the block structure used in traditional Unix and Linux systems. This gives it the capability to access a large number of small files very
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quickly, as well as use only the amount of disk space they would need. However, efficiency is not that much better with larger files.
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File systems are mounted using the mount command described in the next section. Although you can mount a file system directly with only a mount command, you can simplify the process by placing mount information in the /etc/fstab configuration file. Using entries in this file, you can have certain file systems automatically mounted whenever your system boots. For others, you can specify configuration information, such as mountpoints and access permissions, which can be automatically used whenever you mount a file system. You needn t enter this information as arguments to a mount command as you otherwise must. This feature is what allows mount utilities on Gnome or KDE to enable you to mount a file system simply by clicking a window icon. All the mount information is already in the /etc/fstab file. For example, when you add a new hard disk partition to your Linux system, you most likely want to have it automatically mounted on startup, and then unmounted when you shut down. Otherwise, you must mount and unmount the partition explicitly each time you boot up and shut down your system. To have Linux automatically mount the file system on your new hard disk partition, you only need to add its name to the fstab file. You can do this by directly and carefully editing the /etc/fstab file to type in a new entry. An entry in an fstab file contains several fields, each separated by a space or tab. These are described as the device, mountpoint, file system type, options, dump, and fsck fields, arranged in the sequence shown here:
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