Daria,
Most operating system's copy commands (e.g. via Windows Explorer or a copy
or xcopy command) only let you copy a file/directory to the same machine,
not to a remote machine, unless you are using network drives, such as a
mapped drive on Windows. Then it can copy to or from the network drive
that you have access to on the machine. Also, note that these operating
system copy commands are tuned specifically for that one operating system.
The main purpose of the STAF FS COPY requests is to provide a common way
to copy files/directories from one machine to another, no matter what
operating system (Windows or Unix) that you're copying files to or from.
The speed of the copy depends on your network's TCP/IP connections when
copying to a remote machine and so it will generally be slower than a
local copy performed by an operating system's copy command.
You said you used Windows Explorer to copy a directory to a remote
machine? Do you mean you copied the directory to and from a mapped drive
named D:? e.g. Is D: a mapped drive or a local drive?
What is the exact STAF FS COPY request that you submitted?
Are you copying a directory from and to the same machine and are you
submitting the STAF FS COPY request from this same machine?
Did you specify the TOMACHINE option in your STAF FS COPY request? Note
that the TOMACHINE specifies the machine to copy the directory and its
contents to. This defaults to the machine which originated the request.
Specifying "local" indicates to copy the directory to the same machine
that the directory is being copied from. Note that specifying "local"
instead of the from machine's host name can significantly improve
performance, especially if your TCP network performance is slow. This is
because "local" indicates to use the local IPC network interface whereas
specifying a TCP host name or IP address indicates to use the TCP network
interface. (This is documented in the STAF User's Guide.)
I hope this helps explain some of the performance differences you are
seeing.
Also note that you can use the STAF PROCESS START request to run a Windows
operating system's copy command like xcopy if you are copying a directory
from one location to another on the same machine (instead of a STAF FS
COPY request) if its performance is faster. For example:
STAF machine PROCESS START COMMAND "xcopy" PARMS "c:\mydir1 c:\mydir2
/s/e/i/c/v/y" RETURNSTDOUT STDERRTOSTDOUT SAMECONSOLE WAIT
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Daria Holden <dariahol...@gmail.com>
07/29/2009 04:22 PM
To
staf-users@lists.sourceforge.net
cc
Subject
[staf-users] fs copy directory performance
Can you provide any insight as to why the following call in a STAX job
to copy a 13MB directory takes over 15 minutes when copying the same
directory between machines using Windows Explorer takes 15 seconds?
FS <machine1> COPY DIRECTORY D:/QA/Test TODIRECTORY D:/QA/Test
TOMACHINE <machine2> RECURSE KEEPEMPTYDIRECTORIES IGNOREERRORS
Am I missing the "super speedy" option? :-)
Thanks,
Daria
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