Date: Sat, 29 Jan 2000 17:54:03 -0800 (PST) From: Tom <tom@uniserve.com> To: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca> Cc: Kris Kennaway <kris@hub.freebsd.org>, Ataualpa Albert Carmo Braga <atabraga@iqm.unicamp.br>, freebsd-stable@FreeBSD.ORG Subject: Re: JFS Message-ID: <Pine.BSF.4.05.10001291747520.8409-100000@shell.uniserve.ca> In-Reply-To: <200001300024.QAA03100@cwsys.cwsent.com>
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On Sat, 29 Jan 2000, Cy Schubert - ITSD Open Systems Group wrote: > In message <Pine.BSF.4.21.0001291419200.81350-100000@hub.freebsd.org>, > Kris Ken > naway writes: > > On Fri, 28 Jan 2000, Ataualpa Albert Carmo Braga wrote: > > > > > Is there something like JFS (AIX) in FreeBSD ? > > > > Please consult the mailing-list archives. > > 4.4BSD has something like JFS, LFS (Log Structured Filesystem). LFS > developed from a paper by John Ousterhout, the same fellow who > developed Tcl & Tk. All other log structured filesystems, JFS, AdvFS, > Veritas Filesystem, are based on Ousterhout's work. > > Due to the lack of interest, FreeBSD's LFS has fallen into disrepair > over the years. With the implementation of softupdates in FreeBSD I > don't think there is any need for LFS any more. LFS is _VERY_ different from JFS, AdvFS, Vertias, et al. In LFS, the entire filesystem is a log. A typical journalled filesystem, just has a small journal area for metainformation updates. There is a huge difference. Journalling is going to be requirement. The reason why everyone wants a journalled filesystem, is for fast fsckes. Softupdates does not do that yet, but it is apparently in development. Softupdates a lot of the intelligent metadata update re-ordering stuff that is used by a lot of journalled filesystems. I think the idea is to add a journal to softupdates. Sun has done something like this with their UFS, which can operate in journalled and non-journalled mode. > Regards, Phone: (250)387-8437 > Cy Schubert Fax: (250)387-5766 > Sun/DEC Team, UNIX Group Internet: Cy.Schubert@uumail.gov.bc.ca > ITSD > Province of BC > "COBOL IS A WASTE OF CARDS." > Tom Uniserve To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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