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Date:      Sat, 26 Feb 2000 17:55:29 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Martin Welk <mw@theatre.sax.de>
Cc:        questions@FreeBSD.ORG
Subject:   Re: JFS
Message-ID:  <20000226175528.S31594@freebie.lemis.com>
In-Reply-To: <20000225230937.E66576@theatre.lan>
References:  <8625688E.005172D1.00@MCSMTP.MC.VANDERBILT.EDU> <Pine.BSF.4.21.0002231007470.20289-100000@sabre1.sabresdomain.com> <20000225230937.E66576@theatre.lan>

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On Friday, 25 February 2000 at 23:09:38 +0100, Martin Welk wrote:
> On Wed, Feb 23, 2000 at 10:09:41AM +0000, Sabre wrote:
>
>> IBM is doing a project with the Linux community on getting journal'ed
>> file systems, so I presume some of that will spill over to the BSD
>> community.
>
> From what I've read (but don't remember where exactly it was), IBM is
> planning to make the sources for the OS/2 file system available for the
> public and is porting it to Linux. Unfortunately, I don't know what is
> included in this code and how much from JFS (the AIX Journaled File
> System) is inside of it.

The sources are available at
http://oss.software.ibm.com/developerworks/opensource/jfs.  As you
say, they're the OS/2 version, but it is JFS. 

> I found it to be a totally new experience to enlarge partitions or
> change volume groups and more more or less on the fly on a running
> machine :-) (You can even plug-in another SCSI disk, add and
> configure it and - use it, without reboot. That Logical Volume
> Manager _is_ nice!)

You can do that with Vinum now.  Don't confuse the file system with
the volume manager.

> From what I heard, such functionality is currently in development
> for Linux - anybody who can tell more?

I've been talking to some Linux people today, but it's too early to
say anything specific.  They do have a volume manager, but the (Linux)
people I spoke to think it's significantly inferior to Vinum.  They
also seem to think that the best thing about releasing JFS sources
might be the ability to look at the code while writing another one
which is better suited to the Linux environment.  They could very well
be right.

Greg
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