On Jul 9, 2005, at 11:18 AM, Bruce Johnson wrote:
On Jul 8, 2005, at 8:06 PM, GDB-B&W-X.3.9 wrote:
On Jul 8, 2005, at 10:43 PM, Jonas Lopez wrote:
Doug,
What is to be formatted as journaled?
JL
I believe this type of filesystem began with 10.3.x and it's the
required format (Mac OS Extended (Journaled)), for installing X onto.
Journaling is a Unix type filesystem and makes sense when you know
that OS X is based in Unix. You can do a Google to learn more about
it.
It's not required by OS X, and it's not a Unix thing.
Journaling, simply put, is a mechanism for dealing with unexpected
shutdowns on a system. information about recent changes to files are
stored and upon a crash or power failure, the system can rebuild
itself to the last known good state.
Apple has a KB article about it here:
<http://docs.info.apple.com/article.html?artnum=107249>
The first widespread consumer use of File Journaling came about with
Windows NT and the NTFS file system, iirc.
--
Bruce Johnson
Gee Bruce, I hate to disagree with you, but I will. As for being the
required format for 10.3, it was the only choice I was given so that is
what I based my statement on. As for where it came from, I took my
facts from Wikipedia, which put it this way:
The Veritas File System, or VxFS, is an extent-based file system that
was developed by Veritas Software as the first commercial journaling
file system. Through an OEM agreement, VxFS is used as the primary
filesystem of the HP-UX operating system, although HP-UX calls it JFS.
It is also supported on AIX, Linux, Solaris and UnixWare. VxFS was
originally developed for AT&T's UNIX Systems Laboratories.
The on-disk layout of VxFS is versioned and upgradeable while the file
system is mounted.
The version 5 on-disk layout of VxFS supports filesystems up to 32
terabytes in size. Individual files can be up to 2 terabytes in size.
Version 5 was introduced in VxFS 3.5.
The version 6 on-disk layout supports filesystems and files up to 8
exabytes in size. Version 6 also introduced support for named
streams/resource forks, for multiple underlying volumes, and for file
change logs. Version 6 was introduced in VxFS 4.0.
I know that 10.2 will install on a Mac OS Extended, but the only option
I was given for installing 10.3 was Mac OS Extended (Journaled). YMMV
Just a message from Doug...
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