Re: Questions about the dd command
- From: Heinrich Rebehn <rebehn@xxxxxxxxxxxxxxxxx>
- Date: Fri, 29 Feb 2008 17:40:27 +0100
elmo wrote:
I've spent literally hours trying to find direct answers on the dozens1. You should not use dd to copy a filesystem that is currently mounted,
of websites that discuss 'dd'
but the couldn't find what I wanted.
A few questions about the ' dd ' command:
For example: sudo dd if=/dev/sda2 of=/dev/sdb2 bs=1440
1. Which is preferrable; execute the command from an installed
ubuntu (/dev/sda2) or from a ubuntu CD?
2. How do you modify the example to show the data as it is being
copied?
Would this have a drastic effect on how long it takes to complete
the copy
compared to just watching a blinking cursor?
3. What effect on the does the ' bs = ' number have on
the time to complete the copy or the accuracy of the copy? Is
there a
default number if the the bs= is omitted from the command?
because parts of it may be cached in RAM. The copy would be
inconsistent. So you better boot from a ubuntu CD.
2. Standard dd does not have a "progress bar" option. However, it will
report its progress when sent a SIGHUP.
3. I don't know, make measurements yourself. 1440 is a somewhat strange
value, use a multiple of 512 (The standard blocksize)
HTH,
Heinrich
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