Date: Sun, 21 Feb 1999 23:55:44 +0100 (MET) From: Jean-Marc Zucconi <jmz@FreeBSD.ORG> To: ken@plutotech.com Cc: scsi@FreeBSD.ORG Subject: Re: LVD transfer rate Message-ID: <199902212255.XAA73327@qix> In-Reply-To: <199902212223.PAA21380@panzer.plutotech.com> (ken@plutotech.com)
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>>>>> Kenneth D Merry writes: > 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. 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). > - make sure there aren't any settings in the SCSI BIOS that would prevent > things from going at LVD speeds. It is set to 80MB/s > 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) Jean-Marc To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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