Re: [Bug-ddrescue] --exit-on-slow ; NO DEVICE NAMES shown; skip+pause+reopen+skip_more_than_1Gb

[Antonio Diaz Diaz]

Dmitry Kostin wrote:
> > Have you tried --reopen-on-error ? It also reopens the file after slow reads.
>
> Yes, I use -O - but it doesn't help. I think, some pause is still needed.

I'll implement --pause-on-error in the next prerelease then.


> I don't understand the meaning of ' max_max_skipbs = 1<<  30 ' - HOW SHOULD I 
> CHANGE IT either to get no limitation or to limit to about 1Tb?

Setting a max_max_skipbs larger than 2 GiB requires major changes to 
ddrescue. By the moment you can try 'max_max_skipbs = 2000000000' (2GB).


> Now I want to change the time to start skipping on slow, too (set it to about 
> 1-2 s). Where can it be done?

In the same 'slow_read' function (line 150 of rescuebook.h). You will 
need to remove the comparison with the average rate (a_rate), but this 
may perhaps cause false positives.


> > Or, can you please add one more option such as "sensitivity" or something to 
> > set the interval (1-2-5-10-20-30) instead of built-in 30 seconds. (?)
> Maybe, add to "-T / --timeout" option two more parameters of sensitivity: time 
> to start skipping and time to exit on slow.

This sounds too complicated. I'll probably inplement just one option to 
set the initial time to disable 'slow_read'.


> Maybe, there is a quick way to insert/call the <pause> procedure into/from the 
> skipping module code? Just to wait for --pause=<seconds> after each skip.

Yes. Insert 'sleep( pause );' before lines 323 and 379 of rescuebook.cc.


Best regards,
Antonio.