Date: Tue, 16 Apr 2002 10:04:26 -0600 From: "Kenneth D. Merry" <ken@kdm.org> To: "M. Warner Losh" <imp@village.org> Cc: scsi@FreeBSD.ORG Subject: Re: How to get 160MB/s LVD drives to use 160MB/s Message-ID: <20020416100426.A77224@panzer.kdm.org> In-Reply-To: <20020416.000750.89789192.imp@village.org>; from imp@village.org on Tue, Apr 16, 2002 at 12:07:50AM -0600 References: <20020416.000750.89789192.imp@village.org>
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On Tue, Apr 16, 2002 at 00:07:50 -0600, M. Warner Losh wrote: > I'm runing 4.5-release. From my dmesg: > > ahc0: <Adaptec 19160B Ultra160 SCSI adapter> port 0x9000-0x90ff mem 0xdf800000-0 > xdf800fff irq 11 at device 12.0 on pci0 > aic7892: Ultra160 Wide Channel A, SCSI Id=7, 32/255 SCBs > > da0 at ahc0 bus 0 target 0 lun 0 > da0: <IBM DGHS18Y CLAR18( 3C3C> Fixed Direct Access SCSI-3 device > da0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing Enabled > da0: 17501MB (35843670 512 byte sectors: 255H 63S/T 2231C) > da1 at ahc0 bus 0 target 1 lun 0 > da1: <FUJITSU MAF3364L SUN36G 1213> Fixed Direct Access SCSI-2 device > da1: 40.000MB/s transfers (20.000MHz, offset 63, 16bit), Tagged Queueing Enabled > da1: 34732MB (71132959 512 byte sectors: 255H 63S/T 4427C) > > > Notice that I'm only getting 40MB/s transfers. The BIOS detects them > at 40MB/s, even though I have the max transfer set to 160. It does > this with one or two drives on the bus. They are SCA drives in > adapters (any chance it is a jumper on the adapter?). > > How do I get 160MB/s on these drives? As near as I can tell from the > spec sheets, they both should support 160MB/s. There are several possibilities. - your cabling or termination isn't right for Ultra160. (You need a "twisty flat" cable with a terminator block on the end.) - you jumpered the drives for single ended mode - the SCA->HD68 adapters don't do LVD I would guess that the last one is probably the problem, since the first two are more obvious. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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