Date: Fri, 19 Feb 1999 11:05:41 +0100 From: sthaug@nethelp.no To: jlemon@americantv.com Cc: freebsd-scsi@freebsd.org Subject: Re: slow disk performance Message-ID: <18942.919418741@verdi.nethelp.no> In-Reply-To: Your message of "Thu, 18 Feb 1999 21:57:21 -0600" References: <19990218215721.55546@right.PCS>
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> I have a system with the following: > > ahc0: <Adaptec aic7880 Ultra SCSI adapter> rev 0x01 int a irq 11 on pci0.6.0 > ahc0: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs > da1 at ahc0 bus 0 target 1 lun 0 > da1: <Quantum XP32150W L915> Fixed Direct Access SCSI-2 device > da1: 20.0MB/s transfers (10.0MHz, offset 8, 16bit), Tagged Queueing Enabled > da1: 2050MB (4199760 512 byte sectors: 255H 63S/T 261C) > da0 at ahc0 bus 0 target 0 lun 0 > da0: <IBM DCAS-34330W S65A> Fixed Direct Access SCSI-2 device > da0: 40.0MB/s transfers (20.0MHz, offset 8, 16bit), Tagged Queueing Enabled > da0: 4134MB (8467200 512 byte sectors: 255H 63S/T 527C) > > > Basically, an ASUS motherboard with an onboard Adaptec, along with > two 7200 rpm disks. The DCAS-34330W is a 5400 RPM disk. > However, I can't seem to get more than 6MB/sec > out of the drives, when doing sequential reads or writes: I get around 7.5 MB/s reading from the raw device on my DCAS-34330W, using an NCR875 based controller (Tekram). Somewhat less when writing. Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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