Question about the dd command

kaplan71 · 04-07-2010, 01:29 PM

Hi there --

I am experimenting with the dd command, and I had a question about the ibs and obs options. Here is the syntax that I was experimenting with in this example:

Code:

dd if=/dev/sda1 ibs=4096 conv=notrunc,noerror |gzip -9 | (ssh 132.183.12.128 dd of=/roarchive/test/roarchivetest.img.gz obs=4096)

Is there any advantage to utilizing either option in the command syntax, and if so, what would be an optimal setting for each?

frndrfoe · 04-07-2010, 01:48 PM

This is interesting
http://stackoverflow.com/questions/1...s-obs-bs-in-dd

kaplan71 · 04-08-2010, 11:53 AM

Hi there --

The reading was interesting, and this was especially the case for the historical perspective. Basically, if I read the article correctly, using the ibs and obs is not necessary for this scenario.

What do you think?

frndrfoe · 04-08-2010, 02:35 PM

correct, in file and out file are all you minimally need

jefro · 04-08-2010, 04:27 PM

The options may make a big difference between file formats.

JZL240I-U · 04-09-2010, 08:09 AM

Do you know this:

http://www.linuxquestions.org/questi...d.php?t=362506

Search for ibs/obs there...