Re: a tool that allows to continue copying between HDDs

On Mon, Jul 13, 2009 at 12:50:25PM -0700, Mike Castle wrote:
On Mon, Jul 13, 2009 at 12:20 PM, Celejar<celejar@xxxxxxxxx> wrote:
I'm no expert in this stuff, so I'm curious - what is gained by this
over a straight rsync?


In my experience, find | cpio is faster than rsync for moving raw
data around. Not sure why, but it feels that way. It's been a long
time since I've done any speed tests.

If I remember correctly, rsync will still use one process for reading
and another for writing, so you end up reading gigs from disk, shoving
gigs over pipe, writing gigs to disk. I'm not sure if that's still
the case or not. The common tar cf - | tar xf - solution has the same
issue. find | cpio just shoves the list of file names across the
pipe, so there's nearly a third less data being moved around. Of
course, all of that may be immaterial on modern machines.

It may also be that find | cpio has less of the fragmentation issues
that rsync does (see discussions in the week or two on this list).
But that's pure guess work on my part.

So why not just use cp -a ?

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