Date: Sun, 22 Feb 2004 16:00:27 +0000 From: Heinrich Rebehn <rebehn@ant.uni-bremen.de> To: Gabriel Ambuehl <gabriel_ambuehl@buz.ch> Cc: questions@freebsd.org Subject: Re: UNEXPECTED SOFTUPDATES INCONSISTENCY Message-ID: <4038D21B.2030903@ant.uni-bremen.de> In-Reply-To: <1664802739.20040222113449@buz.ch> References: <4037A0BB.8030807@ant.uni-bremen.de> <44n07c85md.fsf@be-well.ilk.org> <40388FF1.4000004@ant.uni-bremen.de> <1664802739.20040222113449@buz.ch>
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Gabriel Ambuehl wrote: > Hi Heinrich Rebehn, > you wrote. > > >>>Make sure you've disabled write caching on the drive firmware >>>itself... > > HR> Does this also apply for RAID disks (twe)? Also, there is no word about > HR> this in man tuning(7). Is this more of a guess or is softupdates > HR> definately dangerous with wite cache enabled? > > I'd say it's the other way round: write cache is dangerous with > softupdates. Softupdates itself is certainly better than no > softupdates, even if it takes a slight performance drop by disabling > write cache. > > I think you should disable the write cache on the 3ware cache (not > sure whether there actually is one, mine don't come with any RAM > sockets) anyway as you'll lose all data in there in the event of a > crash. Why that? I can imagine that i lose data in case of a power failure, but why in case of a crash? And why is write cache only dangerous with softupdates, as you wrote above? I had always write cache enabled on my twe controller, but my problems with softupdates definetely started with 5.2 Since i found no word about disabling write cache in the FreeBSD handbook or in man tuning(7), i would really like to know, if this is just a rumour, or where does it come from? > > > > > Regards, > Gabriel > Heinrich Rebehn University of Bremen Physics / Electrical and Electronics Engineering - Department of Telecommunications - Phone : +49/421/218-4664 Fax : -3341
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