Robocopying to NAS - how long should it take

ringo747 · 20 May 2011 at 00:07

I'm using a robocopy script to backup a folder with a lot of VMs in it. Most of the files are around 15GB in size or greater.

It seems to take absolutely ages for files of this size to upload to NAS. It's a Synology DS211 which should support writes of 50Mb/s. I have it connected up to a Gigabit switch. I am running this on a laptop so it might possibly be a 5400rpm drive.

Does this sound ok? I'd have guessed that it would be much quicker but I'm thinking it is due to the fact that the files are so large. It is doing a robocopy to replace any files that are newer than the existing ones so possibly the comparison takes longer (not sure).

Here is the NAS resource monitor readings:

Edit: It's been going for 2 hours now - something not right surely.

whitecrook · 20 May 2011 at 00:09

Is the laptop connected via gb ?

That seems very slow

ringo747 · 20 May 2011 at 00:13

whitecrook said:
Is the laptop connected via gb ?

That seems very slow

It is indeed. Just checked the connection status again and it is GB.

ringo747 · 20 May 2011 at 00:29

I have just tried doing a simple copy and paste of the vdi files and it copies at around 40Mb/s - something strange there. I thought robocopy was meant to be fast.

23JMZ07 · 20 May 2011 at 00:36

I use robocopy as my main method of backup and for me it yields the same speeds as Copy/Paste. Could you post your robocopy switches?

ringo747 · 20 May 2011 at 00:40

robocopy sourcepath destpath /MIR /ZB /R:3 /V /FP /FFT

Edit: If I run the same command to an empty directory the speeds seem fine. It must only be an issue if a file is being replaced. Strange.

23JMZ07 · 20 May 2011 at 00:42

Try it without restartable mode (/ZB switch)

ringo747 · 20 May 2011 at 00:45

Will give that a try. Thanks.