gddrescue

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gddrescue

by John-385 :: Rate this Message:

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This is probably a dumb question but I really don't know...

Is it possible for me to write the output file to an external drive when
I am reading the file with ddrescue?

Using my last example:

I ran gddrescue using the following command:
sudo ./ddrescue -v /dev/disk1s3 MyVolImage.dmg MyVolRescue.log

Can I change it to:
sudo ./ddrescue -v /dev/disk1s3
/Volumes/SomeFireWireDrive/MyVolImage.dmg
/Volumes/SomeFireWireDrive/MyVolRescue.log


Many thanks!
John










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Re: gddrescue

by Bugzilla from ant_diaz@teleline.es :: Rate this Message:

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John wrote:
> Is it possible for me to write the output file to an external drive when
> I am reading the file with ddrescue?

Yes, but make yourself sure first that the interface, filesystem, etc is
reliable enough for a logfile. Others have discovered the hard way how
bad is to write the logfile to an unreliable place
http://lists.gnu.org/archive/html/bug-ddrescue/2009-06/msg00000.html


Regards,
Antonio.


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Re: gddrescue

by Ben Holt :: Rate this Message:

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Antonio Diaz Diaz said the following:
> John wrote:
>> Is it possible for me to write the output file to an external drive
>> when I am reading the file with ddrescue?
>
> Yes, but make yourself sure first that the interface, filesystem, etc
> is reliable enough for a logfile. Others have discovered the hard way
> how bad is to write the logfile to an unreliable place
> http://lists.gnu.org/archive/html/bug-ddrescue/2009-06/msg00000.html
>
Ah, the simple joys of being held up as an example of what not to do ;-).

Yes, having learnt the hard way, I'd suggest that you not write to a
network file system and particularly not an CIFS/SMB filesystem.  I have
no experience with using NFS for log files, but based on past experience
I wouldn't go there.

Practically, what this means, is that if you are using ddrescue from a
live CD (as I was) you need a known good drive to store the log file to
in addition to the drive you are copying the restored data to.  A USB
stick may be suitable, though I haven't tried.

- Ben


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