Russell Coker <[email protected]> writes:
> On Tue, 26 Mar 2013, "Trent W. Buck" <[email protected]> wrote:
>> Note -a does not do -HSX, and you're only passing -S.
>> Both -H and -S have significant overhead, so pass them iff you need them.
>
> Why does -S have significant overhead? If the source file doesn't
> have blocks of zeros then there shouldn't be any difference, if it
> does have zero blocks then it's just replacing a write with a seek.
Mea culpa, I was speaking from memory and it looks I remembered wrong.
As the manpage says,
-a, --archive archive mode; equals -rlptgoD (no -H,-A,-X)
So sparse isn't in there, but it doesn't have significant overheads.
It *does* conflict with --in-place, which I didn't mention until now.
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