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Number   :  2495
Date     :  2002-07-19
Author   :  Garry Deane
Subject  :  Re: Copy new, delete present/absent
Size(KB) :  2


Mel,

I'd suspect the connection speed of your remote server to be the 
problem. Since this server is remote and is in production, I'd expect 
that data requests to that server would be slower than the same data 
request to the local machine.

Since the data on the local and remote machines are (nearly) 
identical, you could test the data connection/transfer speed by 
timing the execution of a 'dir /s \\ccosnetl\litho\' command and 
repeat with 'dir /s e:\litho\'. You might also try a comparison with 
a command like 'for /r \\ccosnetl\litho %a in (*) do @dir "%a"' which 
by virtue of being multiple commands, might negate the optimisation 
and caching of a single DIR command.

If you see any significant increase in time for the remote machine, 
that is the probable source of the extra time taken for the 'xxcopy 
  /bu/bb/rsy' command. All you need do is consider the 
steps required for your 'remove extra files from local' command. 
Xxcopy will walk the local directory tree and for each file, search 
the remote drive to see if it exists there. For each of the 50,000 
files on the local drive, there would be an average of about 10 
FindNextFile() requests to the remote server (50,000 local 
transactions & 500,000 network transactions). Whilst the same applies 
in reverse with the 'xxcopy   /bu/bn' command, all 
those FindNextFile() requests are local (50,000 network transactions 
& 500,000 local transactions).

Have you tried using 'xxcopy \\ccosnetl\litho\ 
e:\litho\ /bu/bn/k/v2/z' to remove extra files in the destination 
instead of the separate xxcopy command? I don't know whether this is 
functionally any different than the 2 separate commands but it's 
worth a look.

Garry

--- In xxcopy@y..., "mel_evans"  wrote:
> More, information only:
> 
> xxcopy \\ccosnetl\litho\ e:\litho\ /bu/bn/k/v2
> Directories processed = 2,323
> Total data in bytes = 177,087,417
> Elapsed time in sec. = 199
> Action speed (MB/min) = 53.39
> Files examined = 49,983
> Files copied = 404
> Directories created = 34
> Exit code = 0 (No error, Successful operation)
> 
> xxcopy e:\litho\ \\ccosnetl\litho\ /bu/bb/rsy/pd0/q1/on/$yymmdd$/
> $time$.txt/of3
> Directories processed = 2,259
> Total data in bytes = 1,351,819
> Elapsed time in sec. = 1611
> Action speed (MB/min) = 0.05033
> Files deleted = 2
> Log File Created = c:\bat\0207181247.txt
> Exit code = 0 (No error, Successful operation)



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