Date: Sun, 21 Feb 1999 15:23:57 -0700 (MST) From: "Kenneth D. Merry" <ken@plutotech.com> To: jmz@FreeBSD.ORG (Jean-Marc Zucconi) Cc: scsi@FreeBSD.ORG Subject: Re: LVD transfer rate Message-ID: <199902212223.PAA21380@panzer.plutotech.com> In-Reply-To: <199902212218.XAA00376@qix> from Jean-Marc Zucconi at "Feb 21, 1999 11:18:58 pm"
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Jean-Marc Zucconi wrote... > I just installed a LVD drive and the boot message reports only 40MB/s > transfer rate. I expected 80MB/s - did I something wrong ? > > da1: <IBM DDRS-39130D DC1B> Fixed Direct Access SCSI-2 device > da1: Serial Number RE205733 > da1: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing Enabled > da1: 8715MB (17850000 512 byte sectors: 255H 63S/T 1111C) > > This is the only device on the LVD bus (Adaptec controller on a Asus > P2BDS). I also have drives on the 50pin connector, but this should not > be the problem ? There are several things to check: - some drives have a single-ended-only jumper. You should make sure the jumper settings are correct for LVD operation. - make sure there aren't any settings in the SCSI BIOS that would prevent things from going at LVD speeds. 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. Ken -- Kenneth Merry ken@plutotech.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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