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

[me]

Thanks Reon but I don't think it's a problem.

I've disconnect the problem harddisk and connect it again without changing
any configuration. Did the ddrescue again and the current rate went up to
20MB/s (which is much faster than 27kb/s).

I'm very happy that the speed has very much improved. However, I noticed a
difference when I did a fdisk -l. It showed multiple partitions in the
problem hard disk. It used to have only 1 NTFS partition which was
corrupted. Any comments?

Disk /dev/sdf: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xf6f93598

   Device Boot      Start         End      Blocks   Id  System
/dev/sdf1               1          63      506016   82  Linux swap / Solaris
/dev/sdf2             152       60801   487171125    7  HPFS/NTFS
/dev/sdf3   *          64         126      506047+  83  Linux
/dev/sdf4             127         151      200812+  83  Linux

regards,
ridz


"Reon Toerien" <address@hidden>





> On 10 January 2011 04:39, "Reon Toerien" <address@hidden>wrote:

> I would not connect the drives via USB, I always prefer to connect
> directly
> via PATA/SATA.
>
> On 10 January 2011 02:33, <address@hidden> wrote:
>
>> 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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>> > address@hidden
>> > http://lists.gnu.org/mailman/listinfo/bug-ddrescue
>> >
>> >
>> >
>>
>>
>>
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>
>
>
> --
> Kind Regards
> Reon Toerien
> __________________
> PO Box 540 Ballito 4420 South Africa
> Tel: +27 (0) 83 270 2889
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>