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Full Discussion: /ext2 and /ext3
Top Forums UNIX for Dummies Questions & Answers /ext2 and /ext3 Post 93085 by Perderabo on Thursday 15th of December 2005 11:07:38 AM
Old 12-15-2005
/ext3 is a more advanced filesytem than /ext2. A /ext2 filesystem can be upgraded to a /ext3 filesystem. /ext3 is journaled, so it recovers well from crashes. This increased reliability is the biggest deal. Given a choice between the two /ext3 is a clear choice. There are few other added features too.

Pretty much everyone will agree that /ext2 is obsolete. But at this point, the ReiserFS folks and/or the XFS folks will want to tell you that their favorite FS is better than /ext3. We have had threads like that before and nothing useful came from them. Please remember that our rules state: (8) No BSD vs. Linux vs. Windows or similar threads.

So /ext3, ReiserFS, and XFS have all been mentioned. Let's not have a fistfight over which is best. I'll leave the thread open for now. But it's probable that it won't be open for long. Smilie
 
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E2UNDO(8)						      System Manager's Manual							 E2UNDO(8)

NAME
e2undo - Replay an undo log for an ext2/ext3/ext4 filesystem SYNOPSIS
e2undo [ -f ] [ -h ] [ -n ] [ -o offset ] [ -v ] [ -z undo_file ] undo_log device DESCRIPTION
e2undo will replay the undo log undo_log for an ext2/ext3/ext4 filesystem found on device. This can be used to undo a failed operation by an e2fsprogs program. OPTIONS
-f Normally, e2undo will check the filesystem superblock to make sure the undo log matches with the filesystem on the device. If they do not match, e2undo will refuse to apply the undo log as a safety mechanism. The -f option disables this safety mechanism. -h Display a usage message. -n Dry-run; do not actually write blocks back to the filesystem. -o offset Specify the filesystem's offset (in bytes) from the beginning of the device or file. -v Report which block we're currently replaying. -z undo_file Before overwriting a file system block, write the old contents of the block to an undo file. This undo file can be used with e2undo(8) to restore the old contents of the file system should something go wrong. If the empty string is passed as the undo_file argument, the undo file will be written to a file named e2undo-device.e2undo in the directory specified via the E2FSPROGS_UNDO_DIR environment variable. WARNING: The undo file cannot be used to recover from a power or system crash. AUTHOR
e2undo was written by Aneesh Kumar K.V. (aneesh.kumar@linux.vnet.ibm.com) AVAILABILITY
e2undo is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net. SEE ALSO
mke2fs(8), tune2fs(8) E2fsprogs version 1.44.1 March 2018 E2UNDO(8)

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