On 7 Sep 2018 at 15:56, JD wrote:
Date sent: Fri, 07 Sep 2018 15:56:21 -0600
From: JD <jd1008(a)gmail.com>
To: users(a)lists.fedoraproject.org
Subject: Re: OT: fastest way to copy one drive to another
Send reply to: Community support for Fedora users
<users(a)lists.fedoraproject.org>
On 09/07/2018 03:34 PM, Michael D. Setzer II wrote:
> On 7 Sep 2018 at 15:54, Ranjan Maitra wrote:
>
> Date sent: Fri, 7 Sep 2018 15:54:59 -0500
> From: Ranjan Maitra <maitra(a)email.com>
> To: users(a)lists.fedoraproject.org
> Subject: Re: OT: fastest way to copy one drive to another
> Organization: Mailbox Ignored
> Send reply to: users(a)lists.fedoraproject.org
>
>> On Fri, 7 Sep 2018 16:37:49 -0400 Tony Nelson
<tonynelson(a)georgeanelson.com> wrote:
>>
>>> On 18-09-07 15:48:23, jdow wrote:
>>>
>>>> dd if=/dev/<drive1> of=/dev/<drive2> bs=1073741824
>>>> conv=sparse,noerror & pid=$!
>>> bs=1M
>>>
>> Btw, do the drives have to be unmounted? Just making sure.
> Drives should not be mounted at time, or changes could be made during the
> copying process.
>
> The line for the cloning process in my g4l is like this.
> dd bs=1M if=$clonesource 2>/dev/null |jetcat-mod -f 5000 -p $clonesize
> 2>$progout |dd bs=1M of=$clonetarget 2>/dev/null &
>
> Uses a dialog script to set the variables, and then runs the copy command in
> background. The foreground script takes the data written to the progout file
> and displays a progress bar via dialog.
>
> Be very careful to make sure you copy the correct drive to the correct drive,
> since if you get it wrong you loose it all.
>
Michael D. Setzer II,
What is the purpose of inserting the utility
jetcat-mod between the 2 dd commands?
The jetcat-mod is a filter that monitors the process of the copy, and outputs
the info every 5 seconds with this option. The dialog then displays a running
graph of the progress along with estimated speed. In the clone case there is
no compression, so the rate is generally the physical speed of disk. With
image files that are compressed, the effective speed can vary greatly
depending on how much the data was compressed. Mostly just gives
progress versus just waiting for the dd command to finish.
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