1) In our testing, EMCopy has shown good performance (+20-25% improvement) for copying CIFS data as compared to Robocopy with the same number of threads. We recommend using EMCopy as it has other features added as well like migrating local user data to a AD users using the sidmapfile function.  2) EMCopy is a .exe or Windows application. You need to use a Windows host. If you plan migrating data from NetApp filers or Celerra Filers you can use isi_vol_copy or isi_vol_copy_vnx respectively which can be run directly on the Isilon OneFS CLI to eliminate any intermediary copy hosts.  3) There are several methods to compare data sizes between source and destination. I would recommend maintaining a log of each EMCopy session as that log indicates how much data was copied and if there were any errors. Personally, I have seen customers using Beyondcompare and some have used powershell scripts to compare folder sizes (PS I dont have those scripts as they were written by our customers).  Hope this answers your questions.
Hello,  I need to migrate lot of file servers with lot of Tbytes to a new ISILON.  I had 3 questions:   1))  What tool is better for this task ?  Emcopy or Robocopy.  I never use Emcopy, I used in the past Robocopy.  Emcopy, can copy ACL, NTFS permissions, etc ??  2)) I'm novice but I wondered if is possible to launch an instance of emcopy from the isilon without any computer using ssh or something similar to avoid bottlenecks using bridge machine to launch the copy. ?? ( if this is not possible, I understand that the best solution is to launch emcopy from command line in windows 2003/8 server to the Isilon)  3)) What tool or way you recommend after migration is finished ,  to compare/ensure total size between old server and new server is OK ?  Thanks in Advance,  Best Regards
Advice needed EMCOPY or ROBOCOPY???