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Top Forums UNIX for Dummies Questions & Answers Anyone else see a performance hit from ext3 Post 12722 by Neo on Sunday 6th of January 2002 06:35:59 PM
Old 01-06-2002
I use ext2 and love it.... no plans to move to ext3... seems like it has a lot of overhead that I don't need (since my ext2 filesystems don't crash...) Perhaps if you are in an environment where someone powers down a server (all the time) without doing a proper shutdown, ext3 is worth the overhead?
 
Test Your Knowledge in Computers #825
Difficulty: Medium
The term API seems to appear for the first time in the article of Ira W. Cotton, Data structures and techniques for remote computer graphics, published in 1968.
True or False?

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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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