Re: How long should a dd take

From	"Carlos E.R." <robin_listas@es.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: How long should a dd take
Date	2020-03-25 21:25 +0100
Message-ID	<7arskg-efh.ln1@Telcontar.valinor> (permalink)
References	<r5crp4$mn1$1@dont-email.me> <n3apkg-d36.ln1@Telcontar.valinor> <r5dcvp$4nk$1@dont-email.me> <zcidnURrfu4K3-fDnZ2dnUU7-TvNnZ2d@giganews.com> <r5el9r$gn$2@dont-email.me>

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On 25/03/2020 05.05, The Natural Philosopher wrote:
> On 24/03/2020 17:25, Robert Heller wrote:
>> At Tue, 24 Mar 2020 16:37:13 +0000 The Natural Philosopher 
>> <tnp@invalid.invalid> wrote:
>>
>>>
>>> On 24/03/2020 12:13, Carlos E.R. wrote:
>>>> On 24/03/2020 12.43, The Natural Philosopher wrote:
>>>>>
>>>>>
>>>>> I have a 1TB internal disk which is full and also showing a rather
>>>>> high error rate.
>>>>>
>>>>> I have ordered a new disk to replace it of 4TB capacity.
>>>>>
>>>>>
>>>>> It contains backup data so its non essential mostly
>>>>>
>>>>> Yesterday I started to dd it in its entirety to a USB connected 1TB
>>>>> drive.
>>>>>
>>>>> as in
>>>>>
>>>>> dd if=/dev/sdb of=/dev/sdc
>>>>
>>>> Without a buffer it will be terribly slow. Add "bs=16M" or so.
>>>>
>>>> You can add "status=progress", and in the case of USB sticks I add
>>>> "oflag=direct" or the entire system ecomes slow.
>>>>
>>>>> Since I wasn't concerned about optimising for speed. However 15 hours
>>>>> later dd is still running!
>>>>>
>>>>>
>>>>> Is this reasonable or is something actually wrong?
>>>>
>>>> If the source disk is damaged (has errors), it will even be slower or
>>>> worse, fail. It is better to use ddrescue instead.
>>>>
>>>> And if you are using usb2, it is slow.
>>>>
>>>>
>>>>
>>> 24 hours and still chugging.
>>> No errors on the logs...
>>>
>>> I may restart it...
>>
>> kill -USR1 <pid>
>>
>> will tell you how far along it is and how fast it is copying.
>>
>> If you do restart it, try adding the bs param.  bs=16M might not be a bad
>> value.
>>
>>>
>>>
>>
> I did some online research and in the end have used this
> 
> # pv</dev/sdb > /dev/sdc
>   932GB 8:27:10 [31.3MB/s] [==================================>] 100%
> 
> a mere 8 1/2 hours.

Hum.

Description    :                                                        
    PV ("Pipe Viewer") is a tool for monitoring the progress of data through a
    pipeline. It can be inserted into any normal pipeline between two processes
    to give a visual indication of how quickly data is passing through, how long
    it has taken, how near to completion it is, and an estimate of how long it
    will be until completion.



-- 
Cheers, Carlos.

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Thread

How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-24 11:43 +0000
  Re: How long should a dd take "Carlos E.R." <robin_listas@es.invalid> - 2020-03-24 13:13 +0100
    Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-24 16:37 +0000
      Re: How long should a dd take Robert Heller <heller@deepsoft.com> - 2020-03-24 12:25 -0500
        Re: How long should a dd take Eli the Bearded <*@eli.users.panix.com> - 2020-03-24 18:12 +0000
        Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-25 04:05 +0000
          Re: How long should a dd take "Carlos E.R." <robin_listas@es.invalid> - 2020-03-25 21:25 +0100
            Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-26 12:25 +0000
              Re: How long should a dd take "Carlos E.R." <robin_listas@es.invalid> - 2020-03-26 13:52 +0100
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-26 15:43 +0000
                Re: How long should a dd take Rich <rich@example.invalid> - 2020-03-26 15:55 +0000
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-26 18:36 +0000
                Re: How long should a dd take Rich <rich@example.invalid> - 2020-03-26 18:53 +0000
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-27 08:09 +0000
                Re: How long should a dd take Rich <rich@example.invalid> - 2020-03-27 10:00 +0000
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-27 10:15 +0000
                Re: How long should a dd take Rich <rich@example.invalid> - 2020-03-27 15:58 +0000
                Re: How long should a dd take Jean-David Beyer <jeandavid8@verizon.net> - 2020-03-27 13:43 -0400
                Re: How long should a dd take Roger Blake <rogblake@iname.invalid> - 2020-03-27 22:45 +0000
                Re: How long should a dd take ant@zimage.comANT (Ant) - 2020-03-28 17:00 -0500
                Re: How long should a dd take "Carlos E.R." <robin_listas@es.invalid> - 2020-03-27 14:11 +0100
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-27 13:49 +0000
                Re: How long should a dd take Rich <rich@example.invalid> - 2020-03-27 17:44 +0000
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-27 18:31 +0000
                Re: How long should a dd take Rich <rich@example.invalid> - 2020-03-27 19:58 +0000
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-27 20:14 +0000
                Re: How long should a dd take Robert Heller <heller@deepsoft.com> - 2020-03-27 15:13 -0500
                Re: How long should a dd take "Carlos E.R." <robin_listas@es.invalid> - 2020-03-27 21:47 +0100
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-28 05:30 +0000
                Re: How long should a dd take Robert Heller <heller@deepsoft.com> - 2020-03-28 07:33 -0500
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-28 13:41 +0000
                Re: How long should a dd take Robert Heller <heller@deepsoft.com> - 2020-03-28 09:47 -0500
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-28 17:48 +0000
                Re: How long should a dd take Robert Heller <heller@deepsoft.com> - 2020-03-28 14:27 -0500
                Re: How long should a dd take "Carlos E.R." <robin_listas@es.invalid> - 2020-03-28 22:22 +0100
                Re: How long should a dd take The Natural Philosopher <tnp@invalid.invalid> - 2020-03-29 06:41 +0100
                Re: How long should a dd take Jean-David Beyer <jeandavid8@verizon.net> - 2020-03-27 17:02 -0400
                Re: How long should a dd take Rich <rich@example.invalid> - 2020-03-27 21:12 +0000
                Re: How long should a dd take Robert Heller <heller@deepsoft.com> - 2020-03-27 20:35 -0500
                Re: How long should a dd take Jean-David Beyer <jeandavid8@verizon.net> - 2020-03-27 21:35 -0400
                Re: How long should a dd take Robert Heller <heller@deepsoft.com> - 2020-03-27 20:35 -0500
                Re: How long should a dd take "Carlos E.R." <robin_listas@es.invalid> - 2020-03-26 22:03 +0100
                Re: How long should a dd take "Anonymous Remailer (austria)" <mixmaster@remailer.privacy.at> - 2020-03-27 16:01 +0100
      Re: How long should a dd take Roger Blake <rogblake@iname.invalid> - 2020-03-24 19:59 +0000
  Re: How long should a dd take Marc Haber <mh+usenetspam1118@zugschl.us> - 2020-03-24 13:22 +0100
  Re: How long should a dd take Robert Heller <heller@deepsoft.com> - 2020-03-24 08:21 -0500
    Re: How long should a dd take Jean-David Beyer <jeandavid8@verizon.net> - 2020-03-24 14:22 -0400
    Re: How long should a dd take "Carlos E.R." <robin_listas@es.invalid> - 2020-03-24 21:46 +0100
      Re: How long should a dd take Jean-David Beyer <jeandavid8@verizon.net> - 2020-03-24 17:09 -0400
        Re: How long should a dd take "Carlos E.R." <robin_listas@es.invalid> - 2020-03-25 01:20 +0100
          Re: How long should a dd take Jean-David Beyer <jeandavid8@verizon.net> - 2020-03-24 22:06 -0400
      Re: How long should a dd take Robert Heller <heller@deepsoft.com> - 2020-03-24 16:38 -0500

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