Robert P. J. Day wrote:
On Fri, 31 Aug 2007, Ian Malone wrote:
Karl Larsen wrote:
Jacques B. wrote:
Because the clone would be of a
running system. So booting from it would be comparable to booting
from a system that crashed (I'm making an educated guess at that one).
Not a good guess. To use DD you need a computer with dd and a fast cpu. I
did top while dd was working and it was taking 70% of the cpu's time :-P
It's one of the oldest Unix programs: it will copy as fast as your
system can go. Yes, a fast system will copy faster.
i'm guessing he failed to provide a decent blocksize so dd was using
the default blocksize of 512 bytes. that will slow things down in a
hurry.
How would you go about estimating a decent blocksize (other than by
testing)? My first instinct would be to go for some percentage of
the drive's cache. (And it had better be a factor of the amount you
want to copy I suppose.)
--
imalone
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