Date: Mon, 10 Dec 2001 23:14:06 -0500 From: "Matthew Emmerton" <matt@gsicomp.on.ca> To: <freebsd-hackers@FreeBSD.ORG>, "Tony" <tony@ubik.demon.co.uk> Subject: Re: [SUGGESTION] - JFS for FreeBSD Message-ID: <00a301c181fa$4764a5b0$1200a8c0@gsicomp.on.ca> References: <20011210220153.50612.qmail@web21102.mail.yahoo.com> <20011210161410.L92148@elvis.mu.org> <002601c181cb$8c6a5e90$1200a8c0@gsicomp.on.ca> <20011210174711.A3208@mail.slc.edu> <20011210220153.50612.qmail@web21102.mail.yahoo.com> <20011210161410.L92148@elvis.mu.org> <002601c181cb$8c6a5e90$1200a8c0@gsicomp.on.ca> <20011210220153.50612.qmail@web21102.mail.yahoo.com> <20011210174711.A3208@mail.slc.edu> <20011211105617.K63585@monorchid.lemis.com> <20011210195725.A4697@mail.slc.edu> <7UAeNSA2SWF8Iwe5@ubik.demon.co.uk>
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> Most current users will probably not like the speed penalties of a > journal file system, and stick to the faster FS. On the other hand a > solid journal FS may encourage more take up for back end databases, for > e-commerce, data warehousing, etc... The transaction support of JFS isn't really viable for large-scale database implementations because it imposes a real speed penalty. Most large-scale DB2 or Oracle installations use raw disk, and let the transaction support in the database keep everything sane. The real benefit of JFS (or any other journaling FS) is to provide a transactional guarantees for everyday disk activites. The best example I can think of is a large multi-user UNIX box in a programming environment, with multiple CVS trees, local working copies of code, and lots and lots of updates (compiles, checkouts, search-and-replace, etc.) It is in this kind of environment that you want the assurance that any update will either pass or fail -- nothing in between to cause corruption that could potentiall remain undetected and eventually snowball into an unusuable filesystem. -- Matt Emmerton To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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