BY default Robocopy uses the NTFS format. By using the /FFT (Fat File Times) switch option tells Robocopy to consider the file times to be identical if they are within two seconds of each other, even though both source and destination appear to be NTFS. This eliminates unnecessary copying of unmodified files. In addition, I parameter can be set to make Celerra round up the time to the nearest second. This makes robocopy believe the files on Celerra have newer time and therefore does not copy the files. [nasadmin@~]$ server_param server_2 -f cifs -i nanoroundoff -v server_2 : name = nanoroundoff facility_name = cifs default_value = 0 current_value = 0 configured_value = 0 user_action = restart Service change_effective = restart Service range = (0,1) description = Roundup the time information to the next second detailed_description Cifs protocol is able to set time using 64 bits value (time set in 100th of nano second since January 1, 1601 in Gegorian calendar. In Dart we do not have this granularity. This means time value read after set could be different (older). This parameter when set, is roundup the time value to the next second in order to not confused some application if the file is olderthan the time application has stored localy as the last update. Typical application is profile storage on the DM. Setting this param improve performance at log off time, as the application will not try to flush again profile information seeing the last modification date is not older than the time info it has stored localy as the last modification date.  [nasadmin@ ~]$ server_param server_2 -f cifs -m nanoroundoff -v 1 server_2 : done
Doing a CIFS migration and using Robocopy to copy data from Physical server (windows2003 server, NTFS) to Celerra CIFS Server filesystem mount=Native. Robocopy copies all the files on first copy and on subsequent incremental copies also copying most of the files (95%) of files again to Celerra and it is taking significant amount of time to complete. I tried same robocopy commands /E /COPY:DATS /ZB /NP /XJ /R:2 /W:0 /TS /TEE Log+: on my local drive for testing and it does not copy older files which was already copied. It took 40 hrs for incremenal copy and 37 hours for full copy. I guess there is some thign wrong with Celerra filesystem mount? Should I be changing filesystem mount from Native to NT or some thing? any idea?  Dart is 5.6.44.4  Thanks in advance for your help.
CIFS Migration file copy issues