Date: Fri, 04 Oct 2002 09:43:59 -0600 From: Chris Brotherton <chris@evilelement.net> Cc: freebsd-alpha@FreeBSD.org Subject: Re: Alpha PWS 500au SCSI Transfer Rate Message-ID: <3D9DB73F.4090405@evilelement.net> References: <025596A38A894B45AFE62346A6BF47464E2E97@waexch1.qgraph.com>
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Schroeder, Aaron wrote: > IICRC, those Qlogic 1020/1040 cards were only fast-wide cards and not > Ultra... > > Your new hard drive may be Ultra SCSI, but in order to talk to the card, the > drive has downgraded itself to fast wide. > > If you get an ultra wide card, you will see the 40Mb figure. In reality, > you'll never see those transfer rates anyways. The 20MB and 40MB numbers are > just that: numbers. In reality, the most you will get off any given > Ultra-Wide/Fast-Wide SCSI chain is anywhere from 7-12Mb a sec, and that's > flying. > > Ultra160 and Ultra320 are completely different scenarios, those busses > absolutley scream! > > AJ Schroeder > > -----Original Message----- > From: Chris Brotherton [mailto:chris@evilelement.net] > Sent: Thursday, October 03, 2002 11:09 PM > To: freebsd-alpha@FreeBSD.org > Subject: Alpha PWS 500au SCSI Transfer Rate > > > I am a newbie to both SCSI and FreeBSD. > > I have a Digital PWS 500au with an on board Qlogic 1040B Ultra Wide SCSI > Controller. I used to have an IBM Fast wide SCSI hard drive that was > correctly probed with the following message in dmesg. > > da0 at isp0 bus 0 target 0 lun 0 > da0: <IBM DCHS04W 2722> Fixed Direct Access SCSI-2 device > da0: 20.000MB/s transfers (10.000MHz, offset 8, 16 bit), Tagged > Queueing Enabled > > I recently replaced this hard drive with a new Seagate ST336706LW - > 36ES. I notice the following dmesg. > > da0 at isp0 bus 0 target 0 lun 0 > da0: <SEAGATE ST318406LW 010A> Fixed Direct Access SCSI-3 device > da0: 20.000MB/s transfers (10.000MHz, offset 8, 16 bit), Tagged > Queueing Enabled > > My question is: Why doesn't this drive operate at 40.000MB/s since it > is backwards compatible with Ultra Wide SCSI? Do I need to set > something up in the SRM before booting FreeBSD? > > Here is the SCSI controller detection lines from dmesg: > > isp0: <Qlogic ISP 1020/1040 PCI SCSI Adapter> port 0x8000-0x80ff mem > 0x81080000-0x81080fff irq 3 at device 4.0 on pci1 > isp0: interrupting at CIA irq 3 > > Thanks for your help. > > Chris. > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-alpha" in the body of the message > > To Unsubscribe: send mail to majordomo@FreeBSD.org This SCSI controller is on the motherboard and the model number is 1040B. According to Qlogics website, this controller is ultra wide. Chris. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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