Posts tagged pv

Querying dd progress
posted on 2014-11-16 17:44:33

UPDATE: use pkill instead of kill: pkill -usr1 dd is all you need.


Usually dd will only show information about the transfer it did, AFTER its completion.

Or try a second shell, and sending a USR1 signal to the dd process.

First, lets startd a demo dd process:

[sjas@mb ~]$ dd if=/dev/random of=/dev/null

Then we need to find out the process id of this dd process. For this you can use pgrep, but i prefer grepping ps auxf:

[sjas@mb ~]$ ps auxf | grep dd
2:root         2  0.0  0.0      0     0 ?        S    06:25   0:00 [kthreadd]
91:sjas      3351  0.0  0.0  30588  1704 ?        Ss   06:25   0:01 /usr/bin/dbus-daemon --fork --print-pid 5 --print-address 7 --session
134:sjas      6501  0.0  0.0  31980  3496 pts/1    S+   17:43   0:00          \_ vim 180-querying-dd-for-progress.post
143:sjas      3580  0.0  0.0   9228  1248 ?        S    06:26   0:00  \_ ksysguardd
169:sjas      6560  0.0  0.0   9868   636 pts/2    S+   17:46   0:00  |   \_ dd if=/dev/random of=/dev/null
172:sjas      6660  0.0  0.0   7836   892 pts/3    S+   17:49   0:00      \_ grep -i -n --color dd
[sjas@mb ~]$ 

So in this example, the PID is 6560.

From the second shell:

kill -usr1 6560

will then show additionally this in the first shell:

0+99 records in
1+0 records out
512 bytes (512 B) copied, 250.022 s, 0.0 kB/s

Of course, you could also pipe the data through pv or bar, to have a continouus status bar. But maybe you don't want that (will slow down things a bit), or you just forgot, and so you still can query the process for the current progress.

dd progress bar
posted on 2014-11-03 13:48:27

To get a proper progess bar when using dd, try using pv. Maybe apt-get install'ing it is needed, if yes, just go ahead.

Usage shown on the example of copying an .iso onto an usb stick:

[sjas@ctr-014 ~/Downloads]% pv -tpreb CentOS-6.6-x86_64-minimal.iso | dd of=/dev/sdc
 383MB 0:04:09 [1.53MB/s] [========================================>] 100%
 784384+0 records in
 784384+0 records out
 401604608 bytes (402 MB) copied, 265.133 s, 1.5 MB/s
[sjas@ctr-014 ~/Downloads]%

Usually you don't see the second+ lines, and would have to wait 4 minutes until you see your copying was successful.

For small devices this is fine, but when copying whole disks this behaviour becomes VERY annoying.

Another utility would be bar:

bar -if=CentOS-6.6-x86_64-minimal.iso | dd of=/dev/sdc

Same principle as pv, handing it an inputfile and piping it to dd.

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