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Number   :  2581
Date     :  2002-08-01
Author   :  Kan Yabumoto
Subject  :  Re: SLOW copying in ONE directory only
Size(KB) :  1


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
==========================================================

At 2002-08-01 10:33, you wrote:
>I'm using xxcopy to back up one hard drive to another hard drive.
>Using "xxcopy [source] [destination] /clone". I've noticed that ONE
>directory (out of hundreds) copies much slower than everything else.
> Most of the time, I get 4-5 MB/sec transfer rate. In this one
>directory I get a transfer rate that varies up and down but is always
>much slower than this and sometimes gets as slow as about 2 sec/file
>(no difference in speed with files between 10K and 1M in size). And
>the destination hard drive access light is lit for about half of this
>2 seconds/file.





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