Jfs and jfs2

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Operating Systems AIX Jfs and jfs2
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Old 10-11-2009
I think these days - and with the current 64bit AIX and application versions, nobody would really consider jfs any more - and its likely that IBM will drop support for jfs in one of the next AIX versions. Still, there are very old 32bit applications out there, that insist on the jfs api - they just won't work on jfs2. In addition, the old jfs filesystem indeed had their benefit - using 32bit AIX and having a large amount of mini-files, the performance of jfs had been better than the performance of jfs2 due to the linear structure.

Kind regards
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jfs_fscklog(8)						   Extract/Display JFS fsck Log 					    jfs_fscklog(8)

jfs_fscklog - extract a JFS fsck service log into a file and/or format and display the extracted file SYNOPSIS
jfs_fscklog [ -d ] [ -e device ] [ -f output.file ] [ -p ] [ -V ] DESCRIPTION
jfs_fscklog with option -e device extracts the contents of either the most recent or immediately prior (specified with option -p) JFS fsck service log from the specified device, and writes the output to a file. The file name may be specified with the -f option, or the default file name is <pwd>fscklog.new. If the -p option is used, the default file name is <pwd>fscklog.old. jfs_fscklog with option -d formats and displays the contents of the extracted file. jfs_fscklog with options -d and -e device extracts and displays the JFS fsck service log. OPTIONS
-d Format and display a previously extracted JFS fsck service log. -e device Extract the JFS fsck service log from device and store it in a file. (device is the special file name corresponding to the actual device from which the fsck log will be extracted (e.g. /dev/hdb1 )). -f file.name Specify the file name, overriding the default file name. When used with -e device, file.name specifies the name of the file into which the JFS fsck log will be extracted. When used with -d, file.name specifies the name of the extracted file whose contents will be formatted and displayed. file.name must be 127 characters or less in length. file.name will be created in the present working directory unless it is fully qualified. -p Extract the prior log (as opposed to the most recent log). -V Print version information and exit (regardless of any other chosen options). EXAMPLES
Extract the most recent JFS fsck log on /dev/hda5 into <pwd>fscklog.new: jfs_fscklog -e /dev/hda5 Extract the most recent JFS fsck log on /dev/hdb3 into /temp/l9651107.log: jfs_fscklog -e /dev/hdb3 -f /temp/l9651107.log Display the JFS fsck log that was extracted into /temp/l9651107.log: jfs_fscklog -d -f /temp/l9651107.log Extract and display the previous JFS fsck log from /dev/hda8: jfs_fscklog -e /dev/hda8 -d -p REPORTING BUGS
If you find a bug in JFS or jfs_fscklog, please report it via the bug tracking system ("Report Bugs" section) of the JFS project web site: http://jfs.sourceforge.net/ Please send as much pertinent information as possible, including any jfs_fscklog error messages and the complete output of running jfs_fsck with the -v option on the JFS device. SEE ALSO
jfs_fsck(8), jfs_mkfs(8), jfs_tune(8), jfs_logdump(8), jfs_debugfs(8) AUTHOR
Barry Arndt (barndt@us.ibm.com) jfs_fscklog is maintained by IBM. See the JFS project web site for more details: http://jfs.sourceforge.net/ October 28, 2002 jfs_fscklog(8)