[<<]Message[>>]    [<<]Author[>>]    [<<]Subject        [<<]Thread[>>]

Number   :  2588
Date     :  2002-08-02
Author   :  pwantzel
Subject  :  Re: SLOW copying in ONE directory only
Size(KB) :  1


When I tried to xxcopy the same files with /NX0, the copy proceeded 
quickly and without the long delays. So this confirms that this was 
indeed the problem.

Thanks Kan

--- In xxcopy@y..., "pwantzel"  wrote:
> Yes, that sounds right. This directory does indeed contain many 
> (probably thousands) of files that match in the first 6 characters. 

> I'll try it with /NX0 and confirm this.
> 
> So does it seem reasonable to divide my backup job into two pieces, 
> first the whole HD less this directory, then this directory by 
itself 
> with /NX0? Or maybe do all the directories with only data files 
> (i.e. non-executable) with /NX0? Or could you suggest in which 
areas 
> I should be concerned with preserving LFN/SFN matching?
> 
> --- In xxcopy@y..., Kan Yabumoto  wrote:
> > My guess is that the directory has a very large number of
> > SFN-collision. That is, there must be a lot of files
> > which share the same beginning. In most cases, it is
> > safe to ignore discrepancies in LFN-SFN pairing in such
> > a directory. I bet the performance will drastically
> > improve if you try it with adding the /NX0 switch
> > which disables the SFN-preservation feature which is
> > probably the most time-consuming aspect of XXCOPY
> > operation (only when a large number of SFN-collisions
> > take place).
> > 
> > Kan Yabumoto
> > ==========================================================
> > 
> >



This message if part of XXCOPY's message Archive.
The archive contains all the messages posted at Yahoo!Groups: XXCOPY.