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Path: sserve!manuel.anu.edu.au!munnari.oz.au!spool.mu.edu!uwm.edu!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!ira.uka.de!math.fu-berlin.de!news.netmbx.de!Germany.EU.net!mcsun!sun4nl!tuegate.tue.nl!svin09!wsinis07!debra From: debra@wsinis07.info.win.tue.nl (Paul De Bra) Newsgroups: comp.unix.bsd Subject: Re: Weird Problem (50 MHz, SCSI) Keywords: SCSI, file corruption Message-ID: <4395@svin09.info.win.tue.nl> Date: 27 Oct 92 10:57:28 GMT References: <1992Oct14.220847.22548@sics.se> <168382@mbf.UUCP> Sender: news@svin09.info.win.tue.nl Reply-To: debra@info.win.tue.nl Organization: Eindhoven University of Technology, the Netherlands Lines: 25 In article <168382@mbf.UUCP> fmt@mbf.UUCP (Mike Trimberger) writes: >In article <1992Oct14.220847.22548@sics.se> jonas@sisu.se (Jonas Lagerblad) writes: >>I have had quite a lot of problems with two different 50 Mhz cards, I have >>traced the problem to the cache memory, which I don't think behaves quite > ... >>My problems have disappeared totally since disabling the cache, but I have >>ordered new faster cache memory, and is eagerly waiting for it to arrive. > >We have been evaluating some 50MHz Intel PC systems here and discovered >that the caches don't work... I have recently replaced my 386/25 motherboard by a 486/50 and also had cache and disk problems. There was no apparent problem with MS-DOG but Unix had trouble booting and kept giving disk errors occasionally. The cache was *not* at fault (it was a 20ns cache, but with a wait state). The disk or diskcontroller was not at fault either (worked fine with the 386). The problem was solved by replacing the *power supply* by a 300 Watt unit. Even with only the motherboard on a 200Watt ps (and everything else on another) the disk problems did not go away completely. A 486-50 mb is a lot more power-critical than other motherboards. System is running fine now, for a couple of weeks already. With a 486-50 you must get a very good power supply!