Bob Friesenhahn <[EMAIL PROTECTED]> wrote:
> /dev/zero does not have infinite performance. Dd will perform at
> least one extra data copy in memory. Since zfs computes checksums it
> needs to inspect all of the bytes in what is written. As a result,
> zfs will easily know if the block is all zeros and even if the data is
> all zeros, time will be consumed.
>
> On my system, Solaris dd does not seem to create a sparse file. I
> don't have GNU dd installed to test with.
I did not read the older messages in this thread, but:
dd skip=n skips n records on input
dd seek=n seeks n records on output
Whenever you use "dd ... of=name seek=something"
you will have the chance to get a sparse file (depending on the parameters
of the underlying filesystem).
Jörg
--
EMail:[EMAIL PROTECTED] (home) Jörg Schilling D-13353 Berlin
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[EMAIL PROTECTED] (work) Blog: http://schily.blogspot.com/
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