Date: Tue, 16 Apr 2002 10:12:05 -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: <20020416101205.A77341@panzer.kdm.org> In-Reply-To: <20020416100426.A77224@panzer.kdm.org>; from ken@kdm.org on Tue, Apr 16, 2002 at 10:04:26AM -0600 References: <20020416.000750.89789192.imp@village.org> <20020416100426.A77224@panzer.kdm.org>
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On Tue, Apr 16, 2002 at 10:04:26 -0600, Kenneth D. Merry wrote: > 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. One other note -- the jumpers on the adapter are probably used for setting the SCSI ID, delayed start, led output, etc. (There may be an LVD jumper, but it wouldn't make as much sense -- why should the adapter care?) 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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