rsync - Feb 2008 - sync append only file

Hi:

I need periodically rsync a bunch of very big files. These files
are append-only so changes are already at the end of the file.

Because files are big, I assume it will take some time comparing the first
part of files. Is there a way that I can tell rsync to sync only the extra
part at the end of file, and do not compare the first part of files?

Thanks.

Chuang

On Thu, 2008-02-07 at 20:16 -0600, chuang liu wrote:
> I need periodically rsync a bunch of very big files. These files
> are append-only so changes are already at the end of the file.
> 
> Because files are big, I assume it will take some time comparing the first
> part of files. Is there a way that I can tell rsync to sync only the extra
> part at the end of file, and do not compare the first part of files?
The --append option of the current development rsync works the way you
want.  (The option that compares the first parts has been renamed to
--append-verify .)

Matt

Thanks a lot. Will "--backup --inplace" do the same trick?

On Thu, 7 Feb 2008, Matt McCutchen wrote:
> On Thu, 2008-02-07 at 20:16 -0600, chuang liu wrote:
> > I need periodically rsync a bunch of very big files. These files
> > are append-only so changes are already at the end of the file.
> >
> > Because files are big, I assume it will take some time comparing the
first
> > part of files. Is there a way that I can tell rsync to sync only the
extra
> > part at the end of file, and do not compare the first part of files?
>
> The --append option of the current development rsync works the way you
> want.  (The option that compares the first parts has been renamed to
> --append-verify .)
>
> Matt
>
>
>

On Thu, 2008-02-07 at 20:38 -0600, chuang liu wrote:
> Thanks a lot. Will "--backup --inplace" do the same trick?
No, --backup --inplace will make a complete backup copy of the
destination file and then compare the whole source file to the
destination file.

Matt
> On Thu, 7 Feb 2008, Matt McCutchen wrote:
> 
> > On Thu, 2008-02-07 at 20:16 -0600, chuang liu wrote:
> > > I need periodically rsync a bunch of very big files. These files
> > > are append-only so changes are already at the end of the file.
> > >
> > > Because files are big, I assume it will take some time comparing
the first
> > > part of files. Is there a way that I can tell rsync to sync only
the extra
> > > part at the end of file, and do not compare the first part of
files?
> >
> > The --append option of the current development rsync works the way you
> > want.  (The option that compares the first parts has been renamed to
> > --append-verify .)
> >
> > Matt