Re: [Bug-ddrescue] Need help - ddrescue very slow - avg 27kb/s

[me]

Hi Andrew,

Tried your suggestions. There's marginal improvement current rate
increased to 32kb but alternates with 21kb which makes the average about
27kb too.

Initial status (read from logfile)
rescued:     1702 MB,  errsize:       0 B,  errors:       0
Current status
rescued:     1713 MB,  errsize:       0 B,  current rate:    21845 B/s
ipos:     1713 MB,   errors:       0,    average rate:    27198 B/s
opos:     1713 MB,     time from last successful read:       0 s


Both source and destination are attached externally thru USB.

I did a hardware test with Seagate tool and it did not report any problem.

regards,
Ridz



> Hi Ridz.
>
> Maybe try not specifying cluster size?
>
> You can interrupt the current run since you have a log file.  Try running:
>
>  ./ddrescue --v /dev/sdc /media/sde1/rescue.img  /media/sde1/rescue.log
>
> Maybe using synchronous or direct may help (-vDd or -vd or -vD).  Beyond
> that, maybe it's a hardware issue.   How are the source and destination
> drive attached to the computer?
>
> Andrew
>
>
>
>
> --- On Sun, 1/9/11, address@hidden <address@hidden> wrote:
>
> From: address@hidden <address@hidden>
> Subject: Re: [Bug-ddrescue] Need help - ddrescue very slow - avg 27kb/s
> To: address@hidden, address@hidden
> Received: Sunday, January 9, 2011, 5:16 PM
>
> Hi Andrew,
>
> Thanks for replying. I was initially recovering to an NTFS filesystem. The
> average rate never went higher than 27kb. I've read that writing a large
> file to NTFS filesystem can get progressively slower. Therefore, I
> formated my recovery harddisk to ext3. However, there was no improvement -
> the average rate is still 27kb and the current rate never go beyond 30kb.
>
> For the recovery harddisk, I had formatted it following the instructions
> at
> http://www.idevelopment.info/data/Unix/Linux/LINUX_PartitioningandFormattingSecondHardDrive_ext3.shtml
>
> Result of mount of the recovery harddisk:
> /dev/sde1 on /media/sde1 type ext3
> (rw,nosuid,nodev,relatime,errors=continue,data=writeback)
>
> regards,
> Ridz
>
>
>> Hi Ridz.
>>
>> What do you mean by "I've formatted it to type 83".
>>
>> Did you just change the partition type or did you actually format the
>> filesystem?  I ask because writing a large file to an NTFS filesystem
>> can
>> get progressively slower.  If you just changed the partition type, that
>> will have no effect on the filesystem at all.
>>
>> In another terminal, type
>> mount
>>
>> and post the output.  That will show what devices are moutned and what
>> filesystem is in use.
>>
>> Regards,
>>
>> Andrew Zajac
>>
>>
>>
>> --- On Sat, 1/8/11, address@hidden <address@hidden> wrote:
>>
>> From: address@hidden <address@hidden>
>> Subject: [Bug-ddrescue] Need help - ddrescue very slow - avg 27kb/s
>> To: address@hidden
>> Received: Saturday, January 8, 2011, 9:59 PM
>>
>> Hi,
>>
>> Need help. I've ran ddrescue for a few days and it only rescued 10G out
>> of
>> 500GB. I've tried various command of ddresue but I find the average rate
>> to be very slow as compared to other examples that I've read in the
>> archives. I've installed ddrescue 1.8 and 1.13. I'm new to Linux and I'm
>> not sure which version I'm using now. I've also formated my recovery
>> harddisk to ext3 in hope that the speed would increase. But
>> unfortunately
>> it didn't.
>>
>> My hard disks configs are as follows:
>>
>> Problem drive : /dev/sdc  500GB NTFS - Windows detected it as
>> unallocated
>> Recovery drive: /media/sde1  1TB ext3 - I've formatted it to type 83
>>
>> Command:
>>
>> ./ddrescue --no-split --cluster-size=1024 /dev/sdc
>> /media/sde1/rescue.img
>> /media/sde1/rescue.log
>>
>> Current status:
>> rescued:   226559 kB,  errsize:       0 B,  current rate:    27594 B/s
>> ipos:   226559 kB,   errors:       0,    average rate:    27431 B/s
>> opos:   226559 kB,     time from last successful read:       0 s
>>
>> Is there anyway for me to speed up the process.
>> Please help. Thanks.
>>
>> regards,
>> Ridz
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> Bug-ddrescue mailing list
>> address@hidden
>> http://lists.gnu.org/mailman/listinfo/bug-ddrescue
>>
>>
>>
>
>
>
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