Date: Thu, 29 Apr 1999 11:20:05 +0930 From: Greg Lehey <grog@lemis.com> To: Alfred Perlstein <bright@rush.net> Cc: "Paul L. Poynter" <ppoynter@rorke.com>, freebsd-questions@FreeBSD.ORG Subject: Re: BSD Software RAID 0 and 1? Journaling file system? Message-ID: <19990429112005.I46511@freebie.lemis.com> In-Reply-To: <Pine.BSF.3.96.990428133326.10204a-100000@cygnus.rush.net>; from Alfred Perlstein on Wed, Apr 28, 1999 at 01:35:14PM -0500 References: <00f801be9196$7ec76030$7ba493ce@poyntman.rorke.com> <Pine.BSF.3.96.990428133326.10204a-100000@cygnus.rush.net>
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[Format recovered--see http://www.lemis.com/email/email-format.html] On Wednesday, 28 April 1999 at 13:35:14 -0500, Alfred Perlstein wrote: > On Wed, 28 Apr 1999, Paul L. Poynter wrote: > >> Will I have the ability to mirror my boot drives with bsd? Yes. >> Is the filesystem "journaling" like IRIX XFS? 4.4BSD includes a journaling file system, but it hasn't been used much, and I suspect that it's no longer completely reliable. This doesn't seem to be much of an issue for FreeBSD systems. >> (if the filesystem needs to be fsck'd and the filesystem is a very >> large raid, this may take several hours - don't want this) Our goal is to avoid crashing :-) > unfortunatly at this time i'm afraid FreeBSD doesn't offer this > functionality, we DO have raid support, just not fast fsck because > of logging. You may have misunderstood the question. When a journaling/logging file system crashes, you don't need to run fsck: you replay the log. It makes up for the faster fsck by slower performance all the time. This is probably why nobody has been too concerned about it in the past. > btw, softupdates is _almost_ metadata logging, anyone care to > describe what it would take to make fsck and softupdates co-operate > to check point a filesystem? Not I. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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