Date: Fri, 13 Jan 2006 15:39:04 +0300 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: Peter Jeremy <PeterJeremy@optushome.com.au> Cc: Christoph Kukulies <kuku@www.kukulies.org>, freebsd-hackers@freebsd.org Subject: Re: increasing dd disk to disk transfer rate Message-ID: <20060113153732.T73577@woozle.rinet.ru> In-Reply-To: <20060112211300.GB13244@cirb503493.alcatel.com.au> References: <200601120948.k0C9mcqR092895@www.kukulies.org> <20060112211300.GB13244@cirb503493.alcatel.com.au>
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On Fri, 13 Jan 2006, Peter Jeremy wrote: PJ> >The process is running now since yesterday evening and it is at 53 MB PJ> >at a transfer rate of about 1.1 MB/s. PJ> > PJ> >In case the the result being unusable I would like to find a way to make this PJ> >copying faster. PJ> PJ> Note that whilst increasing the DD blocksize will speed up the PJ> transfer, it will also increase the amount of collateral damage when a PJ> hard error occurs. If you rummage around the ports or tools tree, PJ> you'll find a utility (its name escapes me but I believe it was PJ> written by phk) that is designed to do disk-to-disk recovery - it PJ> copys data in big slabs until it gets an error and then works around PJ> the faulty area block by block. PJ> PJ> You should also install /usr/ports/sysutils/smartmontools - this PJ> handles S.M.A.R.T. I would suggest also using src/tools/tools/recoverdisk by phk (I still not sure why it's not a port) Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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