Date: Fri, 07 Jul 2000 19:59:40 -0700 From: Emmanuel Gravel <egravel@earthlink.net> To: freebsd-questions@freebsd.org Subject: Performance issues with dd Message-ID: <3966991C.7BB8086A@earthlink.net>
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As a backup measure, I'm using two hard drives of the same size, but only mounting one, and I have a cron job that dd's one to the other every night. The drives are 18 GB U160 SCSI, on a AHA-29160N. The whole process takes 45 minutes. A quick calc tells me it should be finished at best in 2 minutes, at peak rate. This is over a 20x difference. Does anyone have any idea why it's taking so long? Is it just dd that's the problem? The CPU is a PIII 650, and there's more than enough memory to go, so I don't think the CPU would be any kind of an impact here. Is there a better app out there to do the job? I'm dumping one full raw device to the other, not individual partitions. Could that be another problem? Thanks for any input, I'm at a complete loss here. Emmanuel To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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