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Number   :  4423
Date     :  2003-04-24
Author   :  Kan Yabumoto
Subject  :  Re: win2k to Linux copy
Size(KB) :  1


Carmen wrote:

> Hello all.... I am running the following parameters.
>
> /NCL /CLONE /E /YY /FF10
>
> from a win2k box to a linux box.
>
> I am copying alot more data than expected.
> Is there a problem with win2k to linux file (time, date) L
> comparision.
> Or is my parameters incorrect for this command??
>
> Thanks
> Carmen

Since I don't have a Linux machine connected to our network,
I cannot test. Depending on what file system you use
(Win2K supports both FAT and NTFS), the /FF value may change.
But, the default (2 seconds) setting should be sufficient.
In a sense, specifying /FF10 (for plus and minus 10 seconds)
is in safe side.

But, every time you use any amount of fuzzy comparison,
you are increasing the chance that a different file is
treated as if were the same file.

That is, you need to settle for a fine balance between
a reasonable level of range within which XXCOPY will
treat the file identical. But, if you try to be really
on the safe side, you should make the /FF range as small
as possible.

That is, if you narrow the /FF range, you are making
more files to be treated the different at the expense
of inadvertently copying files that are not necessary
to copy (but copying more files than necessary is safer
than missing a few files that should have been copied).

So, I advise you to stay with the default 2 second.
If you are dealing with a Linux-based volume in either
side of file transfer (either as the source or as the
destination), then 1 second is all you need. This
is because the largest difference after the timestamp
conversion is at most 1 second (for both the NTFS
and FAT volume).

It is much easier to run some test (adding /L to the
command line) and see if all the skipped files are
identical.

BTY, /CLONE /E is redundant since /CLONE has /E in it.

Kan Yabumoto



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