By default rsync will try to transmit only the changed “blocks” in files, it takes time to calculate that ..i have fast network so I just tell it to go ahead and transfer the whole file if has changed, I don’t want you to spend time trying to figure out what specific blocks have changed. I find it helpful when I transfer a lot of small files, your mileage may vary.

thanks Dynamox  i will try it now , but I am not clear what  W will do ?  

thank you so much ! Now its much  clear  what i am trying to do .. Will get back to you with the result tomorrow

try to add W  (ie: -avW). Other option is to run multiple rsync at the same time for individual subdirectories ..of course that depends on the underlying directory structure.

You get to a point with older filers though that the src filer simply cannot deliver faster

thank you dynamox - My inc run time is ~ 9 hours now  when running the script with your reccomendation. I saved 5 hours of precious time .

Thats significant.. good luck with migration.