Re: [Bug-ddrescue] Improve recovery speed by chopping up the drive

[James Watts]

Hello all,

To close the loop...

I will echo the results described in the message link Antonio sent below. Wow, what a difference the file system choice makes! Following advice from Antonio and another contributor to this buglist, I switched the recovery drive to EXT3 and imaged ~300 of 500GB overnight. The data rate averaged around 20MB/s. Amazing!

There is clearly some flaw in NTFS-3G. Using the same setup with both drives formatted as NTFS, the data rate started high (~20MB/s) and gradually decayed to under 100KB/s, never increased, and only imaged ~30 of 500GB overnight. Does anyone know if this issue has been reported to the NTFS-3G team? If not, I'd like to log a bug or at least report results to them.

Finally, I'd like to thank the ddrescue author and community for all the informative responses and suggestions. A true testament to the strength of open source community. Thank you very much for helping me speed things up!

Cheers,

James

On Thu, Aug 13, 2009 at 11:30 AM, Antonio Diaz Diaz <address@hidden> wrote:

James Watts wrote:

What is the filesystem in your destination drive (/media/recoverydrive)?

Both drives use a single, NTFS partition.

NTFS is probably the reason of the slowness. See this message (NTFS-3g eating 100%. Solved by switching to ext3) http://lists.gnu.org/archive/html/bug-ddrescue/2009-06/msg00004.html


Regards,
Antonio.