Date: Mon, 22 Feb 1999 00:20:46 +0100 (MET) From: Jean-Marc Zucconi <jmz@FreeBSD.ORG> To: ken@plutotech.com Cc: scsi@FreeBSD.ORG Subject: Re: LVD transfer rate Message-ID: <199902212320.AAA23952@qix> In-Reply-To: <199902212301.QAA21624@panzer.plutotech.com> (ken@plutotech.com)
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>>>>> Kenneth D Merry writes: >> I have a jumper labelled `SE mode', and this jumper is ON, however the >> drive does not work if I remove the jumper: the drive appears in the >> SCSIselect utility, but it does not reports its capacity, and trying >> to format fails (Not ready, asc/ascq= 40/80). > That jumper forces it into Single Ended mode. OK. this explain why I only get 40MB/s > What kind of cable do you have? LVD drives don't have internal > terminators. You need an LVD cable (one of the "twisty" 68-pin cables) > with a terminator block on the end. I have the right cable, the terminator block is currently removed, but during my tests without the SE jumper, I got similar results with and without the terminator block. >> > I seriously doubt this is your problem, but I've got a machine at work with >> > two 18G Seagate Cheetah II's on a Super Micro motherboard with an onboard >> > 7890. The problem is that the drives are SCA, and the SCA to 68-pin >> > converters we put on them apparantly inhibit LVD. So they only run at >> > 20MHz instead of 40MHz. >> >> No - connectors and cables are standard (80pins) > You have SCA disks? Is the cable terminated? The disk has a SCA connector. The cable is not terminated (the drive is currently at the very end of the cable). Jean-Marc To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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