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robocopy /mir killing server performance

Server 2003 with the 2003 Resource Kit version of robocopy.
Copying 325GB from internal disk (raid10 sas) to external USB disk.

While the copy is running, disk queue length and memory pages/sec in Performance Monitor skyrocket.  The host is also nearly unresponsive.

Do I need to run it multithreaded (can I even run the newer MT version on 32-bit 2003?), or will the IPG option control the performance?
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snowdog_2112
Asked:
snowdog_2112
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1 Solution
 
jawa29Commented:
Hi snowdog_2112

You can add the /IPG:n where n is time in milliseconds. this setting doesn't limit the bandwidth however it will pause n number of milliseconds between pack transfers.

Also add /z so if the transfer gets interrupted it will start again where it left off and not at the beginning of the file.

Jawa29

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snowdog_2112Author Commented:
what's a good IPG setting for the situation I described (copying 320GB from internal disk to USB disk without killing server performance)?

Here's what we're doing:
Symantec BESR backup to internal disk
Post-job command runs scheduled task that fires robocopy [internal] [usb] /MIR

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jawa29Commented:
You could try a higher number first and monitor server performance, if it doesn't improve with say 2000000 (i.e. 2 Secs) then you can increase or decrease if performance does improve.

Jawa29

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snowdog_2112Author Commented:
Thanks.  I'll followup with a report on what value works - it will take some trial/error to find the balance between performance and allowing enough time to finish the job in the allowed window.
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