[olug] using dd to clone a drive

[Justin Reiners]

ddrescue is great, I use it all the time. Hih
On Apr 19, 2016 9:50 AM, "Matthew G. Marsh" <olug4mgm at paktronix.com> wrote:

>
> +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
>>>>> _______________________________________________
>>>>> OLUG mailing list
>>>>> OLUG at olug.org
>>>>> https://lists.olug.org/mailman/listinfo/olug
>>>>>
>>>>> _______________________________________________
>>>> OLUG mailing list
>>>> OLUG at olug.org
>>>> https://lists.olug.org/mailman/listinfo/olug
>>>>
>>>> _______________________________________________
>>> OLUG mailing list
>>> OLUG at olug.org
>>> https://lists.olug.org/mailman/listinfo/olug
>>>
>>>
>>
>>
>> --
>> ***************** ************* *********** ******* ***** *** **
>> "If a problem has no solution, it may not be a problem,
>>  but a fact - not to be solved, but to be coped with
>>  over time." - Shimon Peres
>>
>> "Quis custodiet ipsos custodes?"
>>    (Who can watch the watchmen?)
>>    -- from the Satires of Juvenal
>>
>> "I do not fear computers, I fear the lack of them."
>>    -- Isaac Asimov (Author)
>> ** *** ***** ******* *********** ************* *****************
>> _______________________________________________
>> OLUG mailing list
>> OLUG at olug.org
>> https://lists.olug.org/mailman/listinfo/olug
>>
>>
> --------------------------------------------------
> Matthew G. Marsh
> Special Email Addr for OLUG ;-}
> Phone: (402) 932-7250
> Email: olug4mgm at paktronix.com
> WWW:  http://www.paksecured.org
> --------------------------------------------------
> _______________________________________________
> OLUG mailing list
> OLUG at olug.org
> https://lists.olug.org/mailman/listinfo/olug
>