Date: Wed, 31 Aug 2011 06:11:12 -0700 From: perryh@pluto.rain.com To: basarevych@gmail.com Cc: freebsd-questions@freebsd.org Subject: Re: Is there way to get filename for specific LBA? Message-ID: <4e5e32f0.9who12387o0moTmx%perryh@pluto.rain.com> In-Reply-To: <CANmv3=xTS-Gsm9V6mshvG=kryWJ%2B8DYfP6GMG34eyT8=H9xDbw@mail.gmail.com> References: <CANmv3=xTS-Gsm9V6mshvG=kryWJ%2B8DYfP6GMG34eyT8=H9xDbw@mail.gmail.com>
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Ross <basarevych@gmail.com> wrote: > Aug 31 05:13:24 da kernel: ad6: WARNING - READ_DMA UDMA ICRC error > (retrying request) LBA=107491647 That message is reporting a problem in communication between the drive and the controller (or, perhaps, between the controller and main memory), not a problem reading the media, so the LBA is likely not all that useful (esp. since, if you got no other messages, the retry succeeded so no data was lost). What does egrep 'ad[0-9]|ata' /var/run/dmesg.boot report? > # dd if=/dev/ad6 of=/dev/null bs=1m seek=107491647 count=1 > dd: /dev/null: Inappropriate ioctl for device > > Another question: why does it fail? seek= applies to the output file, so it tried to do a seek on /dev/null :) You probably wanted skip= (or iseek=).
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