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



More information about the freebsd-questions mailing list