ZFS - RAIDZ1 Recovery (Evgeny Sam)

[Mark Felder]

On Tue, May 31, 2016, at 05:15, Willem Jan Withagen wrote:
> On 30-5-2016 22:21, Kevin P. Neal wrote:
> > There are several good ways to duplicate a disk, and at the top of the
> > list are tools known to the people you are going to need help from. That
> > means using the 'dd' command to duplicate the entire disk including the
> > GPT labels. Or use something from Polytropon's list posted to these lists
> > (usually the questions list mostly) every so often.
> > 
> > The dd command when given the "conv=noerror,sync" option can be used to
> > duplicate an entire disk. Then a ZFS scrub can correct the lost blocks.
> 
> Might I suggest dd_rescue here?
> 
> Sort of designed for precisely this problem.
> Does large bulk transfers, but when in error it reduces blocksize to the
> sector, and tries several times....
> And there are lots of other options.
> 
> So it is fast and as accurate as it can get.
> 
> Save my life a few times.
> 

FreeBSD has its own built-in dd_rescue alternative called recoverdisk


-- 
  Mark Felder
  ports-secteam member
  feld at FreeBSD.org