Replacing a failing HD
Craig Deal
craig at advantagecomputer.biz
Wed Oct 19 07:07:07 PDT 2005
> -----Original Message-----
> From: owner-freebsd-questions at freebsd.org
> [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of Gayn Winters
> Sent: Tuesday, October 18, 2005 8:53 PM
> To: 'Craig Deal'; freebsd-questions at freebsd.org
> Subject: RE: Replacing a failing HD
>
>
> > > Craig Deal wrote:
> > > >
> > > >
> > > >>>Hope it's ok to continue this thread, but can you
> > explain in more
> > > >>>detail how to use dd to copy a HD. I read "man dd" and was
> > > >>
> > > >>unable to
> > > >>
> > > >>>figure out how this is done.
> > > >>>
> > > >>>Thanks,
> > > >>>Craig
> > > >>>
> > > >>>_______________________________________________
> > > >>>freebsd-questions at freebsd.org mailing list
> > > >>>http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> > > >>>To unsubscribe, send any mail to
> > > >>
> > > >>"freebsd-questions-unsubscribe at freebsd.org"
> > > >>
> > > >>This is what I have done in the past.
> > > >>
> > > >>dd if=/dev/da0 of=/dev/da1 bs=8192b
> > > >>
> > > >>where da0 is the disk you want to copy and da1 is the new,
> > > blank disk.
> > > >>I should also mention that it is wise to do this in single
> > > user mode.
> > > >>I actually have read this somewhere and understand the
> > point of it,
> > > >>but I must also say that I have done it both ways and they
> > > have both
> > > >>worked.
> > > >>YMMV I would have to say it is all dependant and what you have
> > > >>running.
> > > >>
> > > >>I have done this too many times to count and it is very easy.
> > > >>
> > > >>peace,
> > > >>Bob
> > > >>
> > > >
> > > >
> > > > I tried this and got the following error:
> > > >
> > > > ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR>
> > > > error=40<UNCORRECTABLE>
> > > > LBA=8387712
>
> A couple ideas for dd:
>
> Have you tried bs=512b ?
>
> How about conv=noerror ?
>
>
> -gayn
Using "bs=512b" worked. I booted to the new disk and everything looks ok. I
also ran "fsck" in single user mode, which indicated no problems. Can I
assume everything is ok, or is there anything else I should check?
Craig
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