Checking and repairing your file system by using the e2fsck utility in Visual Studio .NET

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Checking and repairing your file system by using the e2fsck utility
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If you have a corrupt ext2 file system, you can use the e2fsck utility to try to fix it To check a partition by using e2fsck, you must unmount it first and then run the /sbin/e2fsck /dev/device command where /dev/device is your disk drive For example, to force an fsck check on a device called /dev/hda7, use the /sbin/ e2fsck -f /dev/hda7 command Such as check might display output as shown here:
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e2fsck 119, 13-Jul-2000 for EXT2 FS 05b, 95/08/09 Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/hda7: 12/1684256 files (00% non-contiguous), 52897/3367617 blocks
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The e2fsck utility will ask you repair questions that you can avoid by using the -p option
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Increasing reliability with journaling file systems for Linux
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The new buzz in the Linux filesystem arena is the journaling file system A journaling file system is simply a transaction-based file system Each file system activity that changes the file system is recorded in a transaction log In the event of a crash, the file system can replay the necessary transactions to return to a stable state in a very short time This is a technique that many widely used database engines, such as IBM DB2 and Oracle, use to ensure that the file system is always in a known and recoverable state The problem with the ext2 file system is that in the unfortunate event of a crash, the file system can be in such an unclean state that it might be corrupt beyond any meaningful recovery The fsck program that is used to check and potentially repair the file system often cannot do much to fix such problems With a journaling file system such a nightmare is a thing of the past! Because the transaction log records all the activities in the file system, a crash recovery is fast and data loss is minimal
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A journaling file system does not log data in the log; it simply logs meta-data related to disk operations, so replaying the log only makes the file system consistent from the structural relationship and resource allocation point of view So some small data loss is possible Also, logging is subject to the media errors like all other activity Thus, if the media is bad, journaling won t help much
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Part VI Tuning for Performance and Scalability
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The journaling file system is new to Linux but has been available for other platforms Although journaling file-system support is very new to Linux, it has received a lot attention from the industry that is interested in using Linux in the enterprise; thus, journaling file systems will mature in a fast track I highly recommend that you start using this flavor of the journaling file system on an experimental level and become accustomed to its sins and fancies There are several flavors of experimental journaling file system available today ReiserFS is discussed in this section because it is included with Linux kernel 241 (or above), but I would be remiss if I did not list the other major journaling file systems that are also available They are IBM s JFS open source for Linux JFS has been ported from AIX, IBM s own operating system platform, but it is still not quite ready for production use You can find more information on JFS at http://osssoftwareibmcom/ developerworks/opensource/jfs Red Hat s own ext3 file system ext2 +, which has journaling capabilities It is also not ready for prime time You can download the alpha release of ext3 at ftp://ftplinuxorguk/pub/linux/sct/fs/jfs/ ReiserFS, developed by Namesys, which is currently included in the Linux kernel source distribution It is more widely used than the other journaling file systems for Linux So far, it appears to be leading the journaling file system arena for Linux ReiserFS was developed by Hans Reiser, who secured development funding from commercial companies such as MP3, BigStoragecom, SuSe, and Ecilacom These companies all need better, more flexible file systems yesterday, and can immediately channel early beta user experience back to the developers You can find more information on ReiserFS at wwwnamesyscom
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