Date: Mon, 19 Oct 1998 13:18:07 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Terry Lambert <tlambert@primenet.com> Cc: gibbs@plutotech.com (Justin T. Gibbs), julian@whistle.com, guido@gvr.org, dkelly@hiwaay.net, freebsd-fs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: Re: filesystem safety and SCSI disk write caching Message-ID: <199810191924.NAA10003@pluto.plutotech.com> In-Reply-To: Your message of "Mon, 19 Oct 1998 19:11:26 -0000." <199810191911.MAA02817@usr02.primenet.com>
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>I am not presuming to be an expert on SCSI. I *am* presuming to >tell you that Don's experiences, and my own, contradict your >interpretation of the spec. No. You are throwing FUD, unrelated to Don's 'experiences' onto the list. One of the comments I was complaining about was this: >Perhaps they realized that the mpst likely event after a power >fluctuation was a bus reset, and figured "why bother?". This has nothing to do with Don's issue at all. It is also completely faulty logic. >Jumping down my throat about intepretation of the spec. because >the empirically observed behaviour contradicts your knowledge >of the spec. (I do not question that your knowledge of the spec. >far exceeds mine) resolves nothing. The behavior does not contradict my 'interpretation of the spec'. Devices violate the spec all the time, but that is a totally different issue. >I personally still think it has something to do with what happens >when the controller POSTs. > >I would like to see the following from Don before we simply accept >a "magic power glitch": Unless you insist on being argumenative about this, it doesn't matter why or how the cache is invalidated because Don has already decided to turn off his cache. As far as I'm concerned there is nothing more to be gained by this discussion, so I'm going to ignore anything else on this thread. >As a datapoint, I have an NCR controller, and the problem occurs >on my external SyJet 1.5G drive, which, by definition, has its own >power supply, which I would be hard pressed to believe was affected >by my hitting the front panel reset but on my seperately supplied >computer. I do not know what the NCR chips do on POST, nor do I have any experience with the SyJet to know if it has reasonable firmware. This is not a 'datapoint' for Don's experience because it is a totally unrelated device. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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