[olug] using dd to clone a drive

[Matthew G. Marsh]

+1 on that. I actually install this as dd on my systems as the syntax for 
basic work is pretty much the same and the extra error correcting features 
are well worth it. Especially when you use it over a netblock connection.

mgm

On Mon, 18 Apr 2016, Dan Linder wrote:

> If you're looking to save the data that might be in the bad sectors, use
> "ddrescue".  It's restart-able and has options to intensely try the failed
> sectors.
>
> http://www.gnu.org/software/ddrescue/
>
> Dan
>
> On Mon, Apr 18, 2016 at 7:12 PM, Kevin <sharpestmarble at gmail.com> wrote:
>
>> The copy won't complete(I tried it with a similar situation). What I wound
>> up doing is manually creating a filesystem on the new drive, mounting both
>> filesystems, and then using rsync to copy the files over.
>>
>> I think I used CentOS.
>>
>> You can check the status of dd by sending it a -USR1 signal. Note that
>> you'll have to send the dd process itself the signal, not sudo or su or any
>> other similar process. From dd(1):
>>
>>        Sending a USR1 signal to a running 'dd' process makes it print I/O
>> statistics to standard error and then resume copying.
>>
>>               $ dd if=/dev/zero of=/dev/null& pid=$!
>>               $ kill -USR1 $pid; sleep 1; kill $pid
>>
>>               18335302+0 records in 18335302+0 records out 9387674624 bytes
>> (9.4 GB) copied, 34.6279 seconds, 271 MB/s
>>
>>
>> On Sun, Apr 17, 2016 at 10:53 PM, Jay Bendon <jaybocc2 at gmail.com> wrote:
>>
>>> The copy will complete.  Those read errors will turn into block errors on
>>> the destination disk.  It will complete but data may not be available
>>> depending on the number of errors.
>>>
>>> --Jay
>>>
>>> On Sun, Apr 17, 2016 at 8:43 PM, Tom Williamson <twilliam at inebraska.com>
>>> wrote:
>>>
>>>> I tried to use dd to clone a 1 GB drive to another 1 GB drive. I had
>> been
>>>> getting warnings of "many bad sectors" on the one I was trying to copy
>>>> from. When I ran the command, there was no error message, but I could
>> not
>>>> tell if anything was happening. How long should this process take? Will
>>> the
>>>> bad sectors prevent the copying from being able to complete the
>> process?
>>> I
>>>> did see some conditional commands about errors, but I was not sure if
>>> this
>>>> would do what is needed to clone the image.
>>>>
>>>> I am using a live disk with ubuntu 14.04, to execute the process in a
>>>> terminal. This is a 32bit machine that I am working on and the first
>> try
>>>> did not show that anything was done after 10 to 12 hours. I started in
>>> the
>>>> early evening an let it run over night.
>>>>
>>>> Any ideas and information would be appreciated.
>>>>
>>>> Thanks
>>>>
>>>> Tom Williamson
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>
>
>
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Matthew G. Marsh
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