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Newsgroups: comp.unix.bsd.bsdi.misc Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!simtel!hookup!noc.tor.hookup.net!metrics.com!tomh From: tomh@metrics.com (Tom Haapanen) Subject: Re: Quantum Grand Prix 4301S with BSDI? Organization: Software Metrics Inc. Message-ID: <DCEos8.G46@metrics.com> References: <3umm86$fjf@news.trytel.on.ca> <DC86op.7yu@eclipse.sheridanc.on.ca> <DCBp9q.77J@metrics.com> <3v8i2u$nnr@web1.bga.com> Date: Fri, 28 Jul 1995 03:09:43 GMT Lines: 34 dpm@web1.bga.com (David P. Maynard) writes: > Either contact Quantum tech support or get a new disk controller. The > Atlas (and presumably the Grand Prix) drives are "too fast" for the > 154X and 174X controllers with sync SCSI enabled. I got new Atlas > firmware and tools from Quantum and was able to get an XP2150 running > with a 1740 under BSD/OS 2.0. [...] Yes -- it's becoming apparent that this is the issue. Adaptec said that Quantums and some Seagates have this "problem"; other drives do not, according to them. > As I understand it, the problem arises because the Quantum drives have > what they call "ESP." Instead of just caching the whole track, they > pre-compose the actual SCSI response in anticipation of an upcoming > request. When the cache hits, the answers drops on the bus faster > than the older Adaptec cards can handle it. The technology is nice, but it's unfortunate that with this, SCSI is no longer as universally compatible as it was. :( It *would* be nice if there was a jumper on the drive to disable this feature, too. > The Buslogics controllers work fine with the drives. The drive should > also work if you disable sync SCSI, but that would be a shame to do > with the super-fast Grand Prix/Atlas. Our 1742A is a veteran of many disks and definitely non-returnable by now. I'll be returning the Grand Prix instead, I think, and replacing it with either a Micropolis or a Conner -- and praying that it works! :) -- [ /tom haapanen -- tomh@metrics.com -- software metrics inc -- waterloo, ont ] [ "everything that can be invented has been invented." ] [ -- charles h. duell, u.s. patent commissioner, 1899 ]