Date: Fri, 06 Jul 2001 07:46:42 -0500 From: Jonathan Fosburgh <syjef@hal-pc.org> To: Antony T Curtis <antony@abacus.co.uk>, Greg Lehey <grog@FreeBSD.ORG> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: JFS (was: The FreeBSD core team needs your help) Message-ID: <5.1.0.14.0.20010706073728.00a63ec0@mail.hal-pc.org> In-Reply-To: <3B459395.120DFE27@abacus.co.uk> References: <20010608134705.19635.qmail@web14701.mail.yahoo.com> <004001c0f030$36a0d3e0$0600020a@frontend> <20010612120958.G10614@tao.org.uk> <20010612192245.4ce69cf3.steveo@eircom.net> <20010613102151.G5486@wantadilla.lemis.com> <3B42F210.C49FCED8@abacus.co.uk> <20010705090711.D371@sydney.worldwide.lemis.com>
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At 11:31 AM 7/6/01 +0100, Antony T Curtis wrote: <Quite a bit of snippage> > > Since writing that (quite some time ago, IIRC) I have joined IBM and > > am now working with the people who did the JFS port. They > > substantially confirm your viewpoint, with the added information that > > the "old" JFS, now called JFS 1, is being phased out under AIX, and > > the "new" AIX JFS, JFS 2, is based on the same code base as the OS/2 > > port. With that background, IBM's approach makes a lot more sense. > > It's a pity that this issue wasn't clarified earlier. > >Is it JFS2 in AIX5L or will there be a backport to AIX4.3? > > > > All said, I would be interested in a JFS port for FreeBSD .... > > > > I'm going to be doing a lot of work on JFS in the next few months. I > > don't think I'll port it to FreeBSD, but I'll be available for > > questions, and I'll have a better understanding. > >Sounds great... I wonder if they'd accept back in diffs. > > > >> unix soit qui mal y pense > > > > You're aware that the original word of this phrase, "hon(n)i", means > > "ashamed"? > I sent an email about this when the thread first appeared, but perhaps not everyone saw it. I can confirm what Greg said earlier about JFS2 being derived from OS/2's version of JFS. This information came from Share in Long Beach's UserBlue forum. There was a session about future trends in JFS presented by one of IBM's JFS developers. JFS2 was developed as part of Project Monterey and is actually ported to AIX5L on pSeries. Due to the large number of changes, it is not being backported to 4.3.3. (This next bit may not be entirely correct as I am reconstructing from memory something that I saw in February.) Even in AIX5L, JFS1 is still shipped, because JFS2 works in 64 bit mode only. If a system is installed as 32 bit, then you get JFS1. It may be possible to take the older OS/2 version and port it over to FreeBSD, but I am not sure about the ability to run it on 32 bit intel systems. Perhaps Greg will have more to offer on this. JFS2 does have a lot to offer, including creation of inodes on an as-needed basis, rather than creating all that will ever exist when the filesystem is created. This raises the interesting possibility that one may some day be able to shrink a filesystem, and on the fly to boot. ****************************************************************************** Jonathan Fosburgh | Certified AIX Administrator Software Systems Spec. III | ICQ: 32742908 Communications and Computer Services | MSN: syjef@hotmail.com UT MD Anderson Cancer Center | Jabber: syjef@jabber.org Houston, TX | Yahoo: jefosburgh ****************************************************************************** To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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