I had rebuilt my R4 with 4TB drives , replacing out the older 3TB disks. Not wanting to lose my data , i used Migration to expand my size from 9TB to 12TB (in a RAID 5 config). After selecting the parameters and running the migration, it says migration is completed and then says it started afterwards.
It seems to be also running Synchronization but for 2 hours it hasnt moved any further from 0%!
I had attempted to set Background Synchronization Rate to High but it was already set to High in the first place...
What can i do?