Date: Mon, 12 Oct 1998 09:50:42 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Don Lewis <Don.Lewis@tsc.tdk.com> Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, Terry Lambert <tlambert@primenet.com>, julian@whistle.com, freebsd-fs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: Re: filesystem safety and SCSI disk write caching Message-ID: <199810121557.JAA04320@pluto.plutotech.com> In-Reply-To: Your message of "Mon, 12 Oct 1998 06:26:05 PDT." <199810121326.GAA09753@salsa.gv.tsc.tdk.com>
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>} 2) Use a drive with non-bogus firmware. Recent Seagate and IBM >} drives should work just fine. I haven't validated any Quantum >} drives in this regard yet. > >But how can tell if the firmware is non-bogus? Ask Terry since he has stated that he 'doesn't have any drives with non-bogus firmware'. Seriously, the major complaint I've heard about firmware has to do with it not properly flushing the cache on a bus reset. I've never seen that failure mode here, and I've done quite a bit of "external bus reset" testing. You'll need sophisticated tools in order to perform these kinds of tests: 1) Find a paper clip 2) Find a ribbon cable that has enough connectors to attach to the device you want to test and the controller with a connector spare. 3) Start lots of writes 4) Ground pin 40 to pin 39 using the paper clip from step 1. 5) Verify data 6) goto 3 -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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