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Re: [Bug-ddrescue] speed up ddrescue

From: Martin Bittermann
Subject: Re: [Bug-ddrescue] speed up ddrescue
Date: Sun, 14 Jul 2013 19:08:16 +0200
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130620 Thunderbird/17.0.7

first of all, thanks for your hard work

i m trying to make an iso of a damaged hdd(160Gb, buffer I/O err) that contains all my files, projects etc.., so i need it as soon as possible

i would like to know if i can speed up ddrescue somehow
my current specs: ubuntu 13.04 x64, i7 4-cores and a custom linux 3.10 kernel for better performances + ddrescue 1.17 stable

an option to select how many cores to use would be appreciated

it is really slow, i know that these things take times, but i have a good pc so i think i can do this in less time



If your rescue is going slow, the cause is most likely your damaged hard disk. The processor time that ddrescue uses is neglegible, parallelizing ddrescue to use more than one processor core would be pointless. Most time is spend waiting for disk I/O. Especially on damaged drives, I/O times can increase by orders of magnitude. You'll just have to wait until it finishes. If the drive does not yield any data for hours, you should start investigating the cause and maybe try tweaking the settings of ddrescue.

Good luck with your rescue.


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