From owner-freebsd-hackers@FreeBSD.ORG Fri Jan 13 12:39:11 2006 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 64D1016A41F for ; Fri, 13 Jan 2006 12:39:11 +0000 (GMT) (envelope-from marck@rinet.ru) Received: from woozle.rinet.ru (woozle.rinet.ru [195.54.192.68]) by mx1.FreeBSD.org (Postfix) with ESMTP id B9A1943D48 for ; Fri, 13 Jan 2006 12:39:06 +0000 (GMT) (envelope-from marck@rinet.ru) Received: from localhost (localhost [127.0.0.1]) by woozle.rinet.ru (8.13.3/8.13.3) with ESMTP id k0DCd4YW062018; Fri, 13 Jan 2006 15:39:04 +0300 (MSK) (envelope-from marck@rinet.ru) Date: Fri, 13 Jan 2006 15:39:04 +0300 (MSK) From: Dmitry Morozovsky To: Peter Jeremy In-Reply-To: <20060112211300.GB13244@cirb503493.alcatel.com.au> Message-ID: <20060113153732.T73577@woozle.rinet.ru> References: <200601120948.k0C9mcqR092895@www.kukulies.org> <20060112211300.GB13244@cirb503493.alcatel.com.au> X-NCC-RegID: ru.rinet MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0.2 (woozle.rinet.ru [0.0.0.0]); Fri, 13 Jan 2006 15:39:05 +0300 (MSK) Cc: Christoph Kukulies , freebsd-hackers@freebsd.org Subject: Re: increasing dd disk to disk transfer rate X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Jan 2006 12:39:11 -0000 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 *** ------------------------------------------------------------------------