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Number   :  2585
Date     :  2002-08-01
Author   :  pwantzel
Subject  :  Re: SLOW copying in ONE directory only
Size(KB) :  1


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
> ==========================================================
> 
>



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