From owner-freebsd-scsi Sun Feb 21 14:52:48 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from qix (hibou.obs-besancon.fr [193.52.184.7]) by hub.freebsd.org (Postfix) with ESMTP id 855F811545 for ; Sun, 21 Feb 1999 14:52:37 -0800 (PST) (envelope-from jmz@FreeBSD.ORG) Received: (from jmz@localhost) by qix (8.9.3/8.8.7) id XAA73327; Sun, 21 Feb 1999 23:55:44 +0100 (MET) Date: Sun, 21 Feb 1999 23:55:44 +0100 (MET) Message-Id: <199902212255.XAA73327@qix> X-Authentication-Warning: qix: jmz set sender to jmz@qix using -f From: Jean-Marc Zucconi To: ken@plutotech.com Cc: scsi@FreeBSD.ORG In-reply-to: <199902212223.PAA21380@panzer.plutotech.com> (ken@plutotech.com) Subject: Re: LVD transfer rate X-Mailer: Emacs Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >>>>> 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: 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