Date: Tue, 31 May 2016 10:41:42 -0500 From: Mark Felder <feld@FreeBSD.org> To: Willem Jan Withagen <wjw@digiware.nl>, "Kevin P. Neal" <kpn@neutralgood.org>, Evgeny Sam <esamorokov@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS - RAIDZ1 Recovery (Evgeny Sam) Message-ID: <1464709302.3816627.623738921.185742BF@webmail.messagingengine.com> In-Reply-To: <e3b139e8-e205-a2bd-706b-bb3c00215004@digiware.nl> References: <CABDVK=6-zxo-HyG6LwmVAaouO5ZoiSuAhAYoszX9FMoK2qb_Qw@mail.gmail.com> <CAD-rSeeW6pBX7br8eCsdOu2cdL6fyeiJZ8%2BUCHp_P2he_K8vng@mail.gmail.com> <CABDVK=5rZ=TtaDPiu4Or-C7XOZDBurJAZTyyoqjLp_0tevBBew@mail.gmail.com> <20160530202147.GA40137@neutralgood.org> <e3b139e8-e205-a2bd-706b-bb3c00215004@digiware.nl>
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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@FreeBSD.org
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