Date: Thu, 16 May 2002 08:47:01 +1000 From: "Pietralla, Siegfried P" <siegfried.pietralla@eds.com> To: FreeBSD-Questions <freebsd-questions@FreeBSD.ORG> Subject: panic during 'dd' Message-ID: <16649A8D5C73D51183B80008C728EEB7CC0A89@AUSYM103>
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hi all, i'm running v4.3 and trying to backup one hard disk to another with "dd" e.g. "dd if=/dev/ad0s1 of=/dev/ad3s1 bs=128k". my problem is that i'm getting a variable amount ( 5 - 60 seconds ) through the dd before i get a "fatal trap 9: general protection fault while in kernel mode". i think it's always failing at the same instruction/stack/frame and process=idle but i've only noted it down for the last two times. all i'm really after at the moment is an opinion on whether it's h/w or s/w. to eliminate the h/w i did the following to no avail: - i have two simms. i ran the system with both, then one then the other. - i have the second hard disk in a caddy so i removed it and plugged it in directly. - i plugged both drives in on the primary ide controller ( i.e. ad0 and ad1 ) - i plugged both drives in on the secondary ide controller ( i.e. ad2 and ad3 ) i did successfully run "dd if=/dev/ad0s1 of=/dev/null bs=128k" to completion. i also successfully ran "dd if=/dev/ad3s1 of=/dev/null bs=128k" to completion. and i successfully ran "dd if=/dev/zero of=/dev/ad3s1 bs=128k" to completion. so after too much stuffing around i'm back where i started :( any ideas ? what can i do to ( start to ) fix this ? btw, when i ran the dd with the default bs (512) it was running at .5Mb/s ( iostat ). i upped bs to 1m and i saw the xfer rate went up to ~6Mb/s with a xfer size of 128k. is this the expected behaviour? regards, siegfried. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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