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To check the consistency of the file system and repair it if it was is damaged, you can use file system checking tools. fsck checks and repairs a Linux file system. e2fsck is designed to support ext2 and ext3 file systems, whereas the more generic fsck also works on any other file system. The ext2 and ext3 file systems are the file systems normally used for Linux hard disk partitions and floppy disks. Linux file systems beginning with Red Hat 7.3 are normally ext3, which you would use e2fsck to check. fsck and e2fsck take as their argument the device name of the hard disk partition that the file system uses. fsck
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Before you check a file system, be sure that the file system is unmounted. e2fsck should not be used on a mounted file system. To use e2fsck, enter e2fsck and the device name that references the file system. The -p option automatically repairs a file system without first requesting approval from the user for each repair task. The following examples check the disk in the floppy drive and the primary hard drive: # e2fsck /dev/fd0 # e2fsck /dev/hda1 With fsck, the -t option lets you specify the type of file system to check, and the -a option automatically repairs systems, whereas the -r option first asks for confirmation. The -A option checks all systems in the /etc/fstab file.
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were also used to recover file systems after disk crashes or reset-button reboots. With recent releases, journaling capabilities were introduced with file systems like ext3 and ReiserFS. Journaling provides for fast and effective recovery in case of disk crashes, so recovering with fsck or e2fsck is no longer necessary.
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The ext3 and ReiserFS file systems introduced journaling capabilities to Linux systems. Journaling provides for fast and effective recovery in case of disk crashes, instead of using e2fsck or fsck. With journaling, a log is kept of all file system actions, which are placed in a journal file. In the event of a crash, Linux only needs to read the journal file and replay it to restore the system to its previous (stable) state. Files that were in the process of writing to the disk can be restored to their original state. Journaling also avoids lengthy fsck checks on reboots that occur when your system suddenly loses power or freezes and has to be restarted physically. Instead of using fsck to manually check each file and directory, your system just reads its journal files to restore the file system. Keeping a journal entails more work for file system than a non-journal method. Though all journaling systems will maintain a file system s directory structure (what is known as the meta-data), they will offer various levels of file data recovery. Maintaining file data recovery information can be time-consuming, slowing down the file system s response time. At the same time, journaling systems make more efficient use of the file system, providing a faster response time than the non-journaled ext2 file system. There are other kinds of journaling file systems you can use on Linux, including ReiserFS, JFS, and XFS. ReiserFS is named after Hans Reiser, and provides a completely reworked file system structure based on journaling (www.reiserfs.org). Most distributions also provide support for ReiserFS file systems. JFS is the IBM version of a journaling file system, designed for use on servers providing high throughput such as e-business enterprise servers (oss.software.ibm.com/developerworks/opensource/ jfs/). It is freely distributed under the GNU public license. XFS is another high-performance journaling system developed by Silicon Graphics (oss.sgi.com/projects/xfs/). XFS is compatible with RAID and NFS file systems.
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