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Re: [Bug-ddrescue] --input-position and --min-read-rate parameters ignor

From: Antonio Diaz Diaz
Subject: Re: [Bug-ddrescue] --input-position and --min-read-rate parameters ignored
Date: Fri, 20 Jun 2014 23:07:40 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.7.11) Gecko/20050905

Florian Sedivy wrote:
So how to reset the current position to 0 without editing the log file? -M --retrim and -A --try-again do that I think, but one might not want to manipulate the status. Antonio once posted a trick involving an intermediate fake run with -s 0. - Does such a trick still work? (I tried it once, and it didn't.)

Sure it didn't work; '-s0' is an empty domain.

For the trick to work, ddrescue needs to have something to do at the specified position. Else, what is the point of changing it?

Try 'ddrescue -i<pos> -s1 -r1', and if <pos> is not already rescued, ddrescue will change the current position to <pos>.

(Does -L --loose-domain ignore the current position from the log

No, it should not ignore it.

Julien, you can use -Nn (--no-trim --no-split) to stop ddrescue after
 the copying phase and repeatedly try to clone easy areas first. You
 might decrease the --min-read-rate each time to move from the
fastest to slower areas, if that helps in your case.

Or use '--min-read-rate=0' for automatic adjusting to the average read rate. But remember that --min-read-rate is only used during the copying phase.

Some additional questions to Antonio though: - A single read
operation is _never_ timed out by ddrescue itself, right?


Is the calculation for --min-read-rate in v1.18.1 more fine-grained
than one-second-averages, like proposed in the thread for 1.18-pre3?

Not yet.

Is the response-time of errors factored in or ignored when
calculating for --min-read-rate?

Ignored. The calculation is simply (bytes_copied / time).

As skipping is disabled in the sweeping pass, does -a --min-read-rate
have any effect in the third pass of the copying phase?


Best regards,

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