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Top Forums UNIX for Dummies Questions & Answers What is a journaling file system Post 12727 by rwb1959 on Sunday 6th of January 2002 08:38:43 PM
Old 01-06-2002
By definition...

"A journaling file system is a fault-resilient
file system in which data integrity is ensured
because updates to directories and bitmaps are
constantly written to a serial log on disk
before the original disk log is updated. In the
event of a system failure, a full journaling
filesystem ensures that the data on the disk has
been restored to its pre-crash configuration.
It also recovers unsaved data and stores it in
the location where it would have gone if the
computer had not crashed, making it an important
feature for mission-critical applications."

For additional info (one I like very much)
take a look at IBM's JFS for Linux...
http://oss.software.ibm.com/develope...one=opensource
 

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HFS.UTIL(8)						    BSD System Manager's Manual 					       HFS.UTIL(8)

NAME
hfs.util -- HFS/HFS+ file system utility SYNOPSIS
hfs.util -m device mountpoint [mountflag1] [mountflag2] [mountflag3] [mountflag4] hfs.util -p device [mountflag1] [mountflag2] [mountflag3] [mountflag4] hfs.util -J [size] mountpoint hfs.util -U mountpoint hfs.util -N device hfs.util -I mountpoint hfs.util [-aksu] device DESCRIPTION
The hfs.util command supports the mounting, probing, and unmounting of HFS file systems. Options: -a Adopt permissions for the HFS file system at device -I Print out status information about the journal on the HFS file system at mountpoint -J [size] Enable journaling on the HFS file system mounted on mountpoint. An optional size may be specified (e.g. 32M for a 32 megabyte journal). -k Get the UUID key for the HFS file system at device. -m Mount the HFS file system located on device onto mountpoint with the flags mountflag1 mountflag2 mountflag3 mountflag4 -M Force mount the HFS file system located on device onto mountpoint with the flags mountflag1 mountflag2 mountflag3 mountflag4. This is a deprecated option. -N Disable journaling on a HFS+ file system located at device -p Probe the device for an HFS file system using the flags mountflag1 mountflag2 mountflag3 mountflag4 -s Set the UUID key (generates a new UUID value) for the HFS file system at device -u Unmount the HFS file system located at device -U Disable journaling on the HFS+ file system mounted on mountpoint The mountflags referenced above are either: o removable or fixed o readonly or writeable o suid or nosuid o dev or nodev Note that for the device references above, you must only supply the last component of the path to the device in question, such as disk0s2 rather than /dev/disk0s2. SEE ALSO
diskarbitrationd(8) HISTORY
Derived from the Openstep Workspace Manager file system utility programs. Darwin July 16, 2003 Darwin
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