[Zope] Copying Data.fs (was Re: Using XRon to backup my portal)

[Ausum Studio]

Can anyone confirm it?

I'd like to have a theoretical understanding of this subject besides the
practical one, because I suspect that there might come up byte-level
inconsistencies at the copied file, not the original one, when a file larger
than the memory allocated for the application using it  is being copied at
the same it's been appended.

I base my case on the idea that, as data need to be copied by chunks, there
would exist the possibility that not already copied data could have changed
during the copy of the first chunks, meaning that the final copied file
would be different to the original one (at the time the copy started), and
not exactly equal to the same file at the time the copy ended.

Thanks in advance,


Ausum



----- Original Message -----
From: "Jens Vagelpohl" <jens@zope.com>
To: "Ausum Studio" <ausum_studio@hotmail.com>


> i have never seen it that the original file is "frozen" during that
> copy operation. i have successfully copied Data.fs files up to 5 GB (on
> linux) without any indication that the website had any trouble. if you
> can verify that the original turns "read-only" during the copy then
> that could be a windoze-only thing.
>
> jens
>
>
> On Sunday, Oct 27, 2002, at 01:05 US/Eastern, Ausum Studio wrote:
>
> > Just a quick question about it:
> >
> > What happens to the ongoing transactions? I'm using W2K and from other
> > large-file copies I've done it looks like the original file is frozen
> > to
> > changes, unless it's completely uploaded in memory.
> >
> > Do I need to stop Zope in order to allow the OS to perform the copy?
> >
> > Thanks in advance,
> >
>
>
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