In my experience, I don't think there is something faster in the command line as dd.Adjusting the bs parameter can increase the speed, for example, I have 2 HDD that I know have a read/write speed greater than 100 MB/s so I do this. Dd if=/dev/sda of=/dev/sdb bs=100M There is also pv (Needs to be installed first) that checks for the fastest speed on both drives and then proceeds on cloning. Dd if=/dev/zero of=/dev/sda bs=512 count=4096 seek=$(expr `blockdev -getsz /dev/sda` - 4096) and the backticks got lost somewhere along the line of people copy/pasting it between different environments. Old partition tables, LVM metadata, raid metadata etc can cause problems when reusing a drive. TL;DR version: notrunc is only important to prevent truncation when writing into a file. This has no effect on a block device such as sda or sdb. Educational version. I looked into the coreutils source code which contains dd.c to see how notrunc is processed. Jan 03, 2011 Hi i am Ashish, having 12 Yr's of experience in IT field. Worked on some of the most known OS distro's of Linux like RHEL/CentOS, Virtualization (VMware vSphere ESXi 5.x and 6.x), Docker as well as on storage like EMC VNX/VMAX and HPE 3PAR.
I am using dd command for block level copy and just found out that there’s no built in way to check the progress. How do I use the Linux or Unix dd command while coping /dev/sda to /deb/sdb and display a progress bar when data goes through a pipe? How do I monitor the progress of dd on Linux?dd is a free and open source command-line tool for Linux, and Unix-like operating systems. It is mainly used to convert and copy files. Being a program mainly designed as a filter dd usually does not provide any progress indication. This page shows how to show progress copy bar on Linux operating system.
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Linux dd Command Show Progress Copy Bar With Status
You need to use gnu dd command from coreutils version 8.24 or above to use the following option. The syntax is as follows to show progress copy bar with dd command:
Let us pass the progress option to see periodic transfer statistics using GNU dd command:
dd if=/path/to/input of=/path/to/output status=progress
Let us pass the progress option to see periodic transfer statistics using GNU dd command:
# dd if=/dev/sda of=/dev/sdb bs=1024k status=progress
No need to use sudo. I used sudo because I was trying to read and clone a USB stick.
How do you monitor the progress of dd?
Here is another example. First, find out your USB device name using the grep command and hwinfo command:
Sample outputs:
grep -Ff <(hwinfo --disk --short) <(hwinfo --usb --short)
Sample outputs:
Next, unmount the device under Linux:
Finally, write an iso image to USB device named /dev/sdc and monitor the progress of dd:
Sample outputs:
sudo umount /dev/sdc
Finally, write an iso image to USB device named /dev/sdc and monitor the progress of dd:
sudo dd if=openSUSE-Leap-15.1-DVD-x86_64.iso of=/dev/sdc bs=4M status=progress
Sample outputs:
Use pv command monitor the progress of dd command and see status
Another option is to use pv command which allows you to see the progress of data through a pipeline. You need to install pv command as described here. Once installed, type the following commands to see the status bar. Please note that if standard input is not a file and no size was given with the -s option, the progress bar cannot indicate how close to completion the transfer is, so it will just move left and right to indicate that data is moving. It will also show average MB/s rate:
WARNING! These examples may crash your computer and may result into data loss if not executed with care.
Copy /dev/sda to to /dev/sdb:
OR
Sample outputs:
pv -tpreb /dev/sda | dd of=/dev/sdb bs=64M
OR
pv -tpreb /dev/sda | dd of=/dev/sdb bs=4096 conv=notrunc,noerror
Sample outputs:
You can create a progress bar and display using the dialog command as follows:
Sample outputs:
Examples: Use gnu dd command from coreutils version 8.24 or above only
Here is another example from my Mac OS X/MacOS:
Sample outputs:
$ sudo gdd if=ZeroShell-3.6.0-USB.img of=/dev/disk5 bs=1024k status=progress
Sample outputs:
How do you monitor the progress of dd on Linux?
If you are using an older version of dd or cannot install the pv command, try the following simple one-liner bash shell while loop/command:
Sample outputs:
Conclusion
The dd command is wonderful, and there are various ways to display a progress indicator with dd. You learned how to monitor the progress of dd using the inbuilt status=progress option to the dd command. Another option is to use the pv tool. Finally, you learned that how to show dd progress in Linux without using pv or status= progress option. See GNU dd man page here for more info.
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Linux > Aministration > dd
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