Date: Fri, 14 Jan 2000 09:45:00 +0100 (CET) From: Micke Josefsson <mj@isy.liu.se> To: freebsd-questions@freebsd.org Subject: Expected SCSI speed question Message-ID: <XFMail.000114094500.mj@isy.liu.se>
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I have a 200 MHz K6 system (FBSD 3.2), Adaptec 2940UW SCSI-adaptor and Seagate ST19171W Hard disk. The Seagate (Barracuda 9) disk is specced to up to 40 Mbytes/sec Max sync. SCSI transfer rate. But whatever tests I run (copying large files to and fro, dd from disk to /dev/null for example) the actual speed is never more than around 0.5 MB/s according to 'systat -io 1' or 'systat -vm 1'. Is there a knob to turn to speed it up or is this a bottleneck due to the processor? Cheers, Micke PS. I have used the same disk on a dual ppro 233MHz system, same SCSI-adaptor with about the same transfer speeds... ---------------------------------- Michael Josefsson, MSEE mj@isy.liu.se This message was sent by XFMail running on FreeBSD 3.1 ---------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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